commit 76a02076c93132338fb001ed281440e8270f9015
Author: janghanul090801 <25s100@sunrint.hs.kr>
Date:   Fri Sep 12 14:47:48 2025 +0900

    2025 SSF Public

diff --git a/.github/workflows/black-check.yml b/.github/workflows/black-check.yml
new file mode 100644
index 0000000..cac0448
--- /dev/null
+++ b/.github/workflows/black-check.yml
@@ -0,0 +1,68 @@
+name: Black Formatter Check
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  black-check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Get commit messages
+        id: commits
+        run: |
+          messages=$(gh pr view ${{ github.event.pull_request.number }} --repo ${{ github.repository }} --json commits --jq '.commits[].message')
+          if echo "$messages" | grep -q "chore: format code with black"; then
+            echo "skip=true" >> $GITHUB_OUTPUT
+          else
+            echo "skip=false" >> $GITHUB_OUTPUT
+          fi
+        env:
+          GH_TOKEN: ${{ secrets.GH_TOKEN }}
+
+      - name: Set up Python 3.x
+        if: steps.commits.outputs.skip == 'false'
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
+
+      - name: Install black
+        if: steps.commits.outputs.skip == 'false'
+        run: pip install black
+
+      - name: Run black --check
+        if: steps.commits.outputs.skip == 'false'
+        id: black-check
+        run: |
+          black . --check
+        continue-on-error: true
+
+      - name: Comment on PR (success)
+        if: steps.commits.outputs.skip == 'false' && steps.black-check.outcome == 'success'
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GH_TOKEN }}
+          script: |
+            github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              body: "> [!NOTE]\n> 🎉 Black 포매팅 검사가 성공적으로 완료되었어요.\n`/review`로 리뷰를 요청하실 수 있어요."
+            })
+
+      - name: Comment on PR (failure)
+        if: steps.commits.outputs.skip == 'false' && steps.black-check.outcome == 'failure'
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GH_TOKEN }}
+          script: |
+            github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              body: "> [!WARNING]\n> 😢 코드 포매팅이 필요해요.\n`black .` 명령어로 코드를 포매팅하거나 `/format` 명령어를 사용해 주세요."
+            })
diff --git a/.github/workflows/comment-command.yml b/.github/workflows/comment-command.yml
new file mode 100644
index 0000000..d6dccde
--- /dev/null
+++ b/.github/workflows/comment-command.yml
@@ -0,0 +1,118 @@
+name: PR Comment Commands
+
+on:
+  issue_comment:
+    types: [created]
+
+jobs:
+  format:
+    if: >
+      startsWith(github.event.comment.body, '/format') &&
+      github.event.issue.pull_request != null &&
+      !contains(github.event.comment.body, '[!NOTE]')
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout PR branch
+        uses: actions/checkout@v3
+        with:
+          ref: refs/pull/${{ github.event.issue.number }}/head
+          token: ${{ secrets.GH_TOKEN }}
+
+      - name: Set up Python 3.x
+        uses: actions/setup-python@v4
+        with:
+          python-version: '3.x'
+
+      - name: Install black
+        run: pip install black
+
+      - name: Run black
+        run: black .
+
+      - name: Get PR branch name
+        id: get_pr_branch
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GH_TOKEN }}
+          script: |
+            const pr = await github.rest.pulls.get({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: context.issue.number
+            });
+            core.setOutput('branch', pr.data.head.ref);
+
+      - name: Commit & Push if changed
+        env:
+          PR_BRANCH: ${{ steps.get_pr_branch.outputs.branch }}
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+
+          if [ -n "$(git status --porcelain)" ]; then
+            git add .
+            git commit -m "chore: format code with black"
+            git push origin HEAD:${PR_BRANCH}
+          else
+            echo "No changes to commit."
+          fi
+
+      - name: Comment on PR
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GH_TOKEN }}
+          script: |
+            github.rest.issues.createComment({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+                body: "> [!NOTE]\n> 코드 포매팅이 완료되었어요."
+            })
+
+  review:
+    if: >
+      startsWith(github.event.comment.body, '/review') &&
+      github.event.issue.pull_request != null &&
+      !contains(github.event.comment.body, '[!NOTE]')
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: write
+      pull-requests: write
+
+    steps:
+      - name: Label PR as "review required"
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GH_TOKEN }}
+          script: |
+            github.rest.issues.addLabels({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              labels: ["status: review required"]
+            })
+      - name: Request reviewers
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GH_TOKEN }}
+          script: |
+            const pr = await github.rest.pulls.get({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: context.issue.number
+            });
+            const submitter = pr.data.head.user.login;
+            const reviewers = ["norhu1130", "janghanul090801"].filter(r => r !== submitter);
+            if (reviewers.length > 0) {
+              await github.rest.pulls.requestReviewers({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                pull_number: context.issue.number,
+                reviewers
+              });
+            }
diff --git a/.github/workflows/issue_or_pr.yml.disabled b/.github/workflows/issue_or_pr.yml.disabled
new file mode 100644
index 0000000..e1d30db
--- /dev/null
+++ b/.github/workflows/issue_or_pr.yml.disabled
@@ -0,0 +1,40 @@
+name: Issue or PR Label
+
+on:
+  pull_request:
+    types: [opened]
+  issues:
+    types: [opened]
+
+jobs:
+  add-label:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Check if issue or PR is opened
+        id: check
+        run: |
+          if [[ "${{ github.event_name }}" == "issues" ]]; then
+            echo "type=issue" >> $GITHUB_OUTPUT
+          elif [[ "${{ github.event_name }}" == "pull_request" ]]; then
+            echo "type=pull_request" >> $GITHUB_OUTPUT
+          else
+            echo "type=unknown" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Add label to issue or PR
+        if: steps.check.outputs.type == 'issue' || steps.check.outputs.type == 'pull_request'
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GH_TOKEN }}
+          script: |
+            const label = steps.check.outputs.type === 'issue' ? 'type: issue' : 'type: pull request';
+            await github.rest.issues.addLabels({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+              labels: [label]
+            });
\ No newline at end of file
diff --git a/.github/workflows/pr-merge-status.yml b/.github/workflows/pr-merge-status.yml
new file mode 100644
index 0000000..6b52705
--- /dev/null
+++ b/.github/workflows/pr-merge-status.yml
@@ -0,0 +1,55 @@
+name: PR Status - When Merged
+
+on:
+  pull_request:
+    types: [closed]
+
+jobs:
+  handle-merge:
+    # PR이 closed 되었을 때, merged 여부를 검사하여 merged=true인 경우에만 실행
+    if: github.event.pull_request.merged == true
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - name: Update status to done
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GH_TOKEN }}
+          script: |
+            const prNumber = context.payload.pull_request.number;
+
+            const labelsToRemove = [
+              "status: in progress",
+              "status: review required",
+              "status: change required",
+              "status: waiting merge"
+            ];
+
+            const { data: currentLabels } = await github.rest.issues.listLabelsOnIssue({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: prNumber
+            });
+
+            for (const labelName of labelsToRemove) {
+              if (currentLabels.some(l => l.name === labelName)) {
+                await github.rest.issues.removeLabel({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  issue_number: prNumber,
+                  name: labelName
+                }).catch(err => {
+                  if (err.status !== 404) throw err;
+                });
+              }
+            }
+
+            // 병합이 완료된 PR에 "status: done" 라벨을 부착
+            await github.rest.issues.addLabels({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: prNumber,
+              labels: ["status: done"]
+            });
\ No newline at end of file
diff --git a/.github/workflows/pr-review-status.yml b/.github/workflows/pr-review-status.yml
new file mode 100644
index 0000000..bfa0482
--- /dev/null
+++ b/.github/workflows/pr-review-status.yml
@@ -0,0 +1,66 @@
+name: PR Status - Review Outcome
+
+on:
+  pull_request_review:
+    types: [submitted]
+
+jobs:
+  handle-review-outcome:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - name: Handle review outcomes
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GH_TOKEN }}
+          script: |
+            const prNumber = context.payload.pull_request.number;
+
+            const labelInProgress   = "status: in progress";
+            const labelReviewReq    = "status: review required";
+            const labelChangeReq    = "status: change required";
+            const labelWaitingMerge = "status: waiting merge";
+
+            const labelsToRemove = [
+              labelInProgress,
+              labelReviewReq,
+              labelChangeReq,
+              labelWaitingMerge
+            ];
+
+            const { data: currentLabels } = await github.rest.issues.listLabelsOnIssue({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: prNumber
+            });
+
+            for (const labelName of labelsToRemove) {
+              if (currentLabels.some(l => l.name === labelName)) {
+                await github.rest.issues.removeLabel({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  issue_number: prNumber,
+                  name: labelName
+                }).catch(err => {
+                  if (err.status !== 404) throw err;
+                });
+              }
+            }
+
+            if (context.payload.review.state === "approved") {
+              await github.rest.issues.addLabels({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: prNumber,
+                labels: [labelWaitingMerge]
+              });
+            } else if (context.payload.review.state === "changes_requested") {
+              await github.rest.issues.addLabels({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: prNumber,
+                labels: [labelChangeReq]
+              });
+            }
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..1e0a72e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,232 @@
+__pycache__# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# UV
+#   Similar to Pipfile.lock, it is generally recommended to include uv.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#uv.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/latest/usage/project/#working-with-version-control
+.pdm.toml
+.pdm-python
+.pdm-build/
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+.idea/
+
+# Abstra
+# Abstra is an AI-powered process automation framework.
+# Ignore directories containing user credentials, local state, and settings.
+# Learn more at https://abstra.io/docs
+.abstra/
+
+# Visual Studio Code
+#  Visual Studio Code specific template is maintained in a separate VisualStudioCode.gitignore 
+#  that can be found at https://github.com/github/gitignore/blob/main/Global/VisualStudioCode.gitignore
+#  and can be added to the global gitignore or merged into this file. However, if you prefer, 
+#  you could uncomment the following to ignore the entire vscode folder
+# .vscode/
+
+# Ruff stuff:
+.ruff_cache/
+
+# PyPI configuration file
+.pypirc
+
+# Cursor
+#  Cursor is an AI-powered code editor. `.cursorignore` specifies files/directories to
+#  exclude from AI features like autocomplete and code analysis. Recommended for sensitive data
+#  refer to https://docs.cursor.com/context/ignore-files
+.cursorignore
+.cursorindexingignore
+
+# Created by https://www.toptal.com/developers/gitignore/api/macos
+# Edit at https://www.toptal.com/developers/gitignore?templates=macos
+
+### macOS ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### macOS Patch ###
+# iCloud generated files
+*.icloud
+
+# End of https://www.toptal.com/developers/gitignore/api/macos
diff --git a/Backend/__init__.py b/Backend/__init__.py
new file mode 100644
index 0000000..5d3f802
--- /dev/null
+++ b/Backend/__init__.py
@@ -0,0 +1,12 @@
+from .router.router import router
+import sys
+from pathlib import Path
+from Backend.utils.run_server import init_FastAPI
+
+# 프로젝트 루트를 Python 경로에 추가
+project_root = Path(__file__).parent
+sys.path.insert(0, str(project_root))
+
+app = init_FastAPI()
+
+app.include_router(router)
diff --git a/Backend/core/security.py b/Backend/core/security.py
new file mode 100644
index 0000000..c5866cf
--- /dev/null
+++ b/Backend/core/security.py
@@ -0,0 +1,78 @@
+from jose import jwt, JWTError
+from datetime import datetime, timedelta
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from typing import Optional
+
+ACCESS_TOKEN_EXPIRE_MINUTES = 30
+
+SECRET_KEY = "WIXYAhAfU6tLOloxqHgI4thAAo6kshkK"
+ALGORITHM = "HS256"
+
+security = HTTPBearer()
+
+
+def create_access_token(data: dict):
+    to_encode = data.copy()
+    expire = datetime.now() + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
+    return encoded_jwt
+
+
+def verify_token(token: str) -> Optional[dict]:
+    try:
+        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
+        return payload
+    except JWTError:
+        return None
+
+
+async def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(security),
+):
+    from ..schemas.user import User
+    from ..utils.db import fetch_one
+
+    credentials_exception = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Bearer"},
+    )
+
+    try:
+        payload = verify_token(credentials.credentials)
+        if payload is None:
+            raise credentials_exception
+
+        username: str = payload.get("sub")
+        if username is None:
+            raise credentials_exception
+
+    except JWTError:
+        raise credentials_exception
+
+    # 데이터베이스에서 사용자 조회
+    user_row = await fetch_one("SELECT * FROM users WHERE username = ?", (username,))
+
+    if user_row is None:
+        raise credentials_exception
+
+    user = User(
+        id=user_row["id"],
+        username=user_row["username"],
+        email=user_row["email"],
+        password_hash=user_row["password_hash"],
+        salt=user_row["salt"],
+        created_at=user_row["created_at"],
+        profile_image_path=user_row["profile_image_path"],
+        is_active=user_row["is_active"],
+    )
+
+    return user
+
+
+async def get_current_active_user(current_user=Depends(get_current_user)):
+    if not current_user.is_active:
+        raise HTTPException(status_code=400, detail="Inactive user")
+    return current_user
diff --git a/Backend/router/endpoints/avatar.py b/Backend/router/endpoints/avatar.py
new file mode 100644
index 0000000..ee4b48e
--- /dev/null
+++ b/Backend/router/endpoints/avatar.py
@@ -0,0 +1,49 @@
+from fastapi import APIRouter, HTTPException, Depends
+from ...schemas.avatar import (
+    AvatarUpdate,
+    AvatarResponse,
+    AvatarOptions,
+)
+from ...services.avatar_service import AvatarService
+from ...core.security import get_current_user
+from ...schemas.user import User
+
+router = APIRouter(prefix="/avatar", tags=["avatar"])
+avatar_service = AvatarService()
+
+
+@router.get("", response_model=AvatarResponse)
+async def get_my_avatar(
+    current_user: User = Depends(get_current_user),
+) -> AvatarResponse:
+    try:
+        avatar = await avatar_service.get_or_create_avatar(current_user.id)
+        return avatar.to_response()
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.put("", response_model=AvatarResponse)
+async def update_avatar(
+    avatar_data: AvatarUpdate, current_user: User = Depends(get_current_user)
+) -> AvatarResponse:
+    try:
+        avatar = await avatar_service.update_avatar(current_user.id, avatar_data)
+        return avatar.to_response()
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.get("/options", response_model=AvatarOptions)
+async def get_avatar_options() -> AvatarOptions:
+    try:
+        return await avatar_service.get_avatar_options()
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+@router.get("/{user_id}", response_model=AvatarResponse)
+async def get_avatar_by_userId(user_id: int) -> AvatarResponse:
+    avatar = await avatar_service.get_avatar_by_userId(user_id)
+    if not avatar:
+        raise HTTPException(status_code=404, detail="Avatar not found")
+    return avatar.to_response()
diff --git a/Backend/router/endpoints/diary.py b/Backend/router/endpoints/diary.py
new file mode 100644
index 0000000..e01a508
--- /dev/null
+++ b/Backend/router/endpoints/diary.py
@@ -0,0 +1,102 @@
+from fastapi import (
+    APIRouter,
+    HTTPException,
+    Depends,
+    UploadFile,
+    File,
+)
+from typing import List, Optional
+from ...schemas.diary import DiaryCreate, DiaryUpdate, DiaryResponse, Diary
+from ...services.diary_service import DiaryService
+from ...core.security import get_current_user
+from ...schemas.user import User
+
+router = APIRouter(prefix="/diary", tags=["diary"])
+diary_service = DiaryService()
+
+
+@router.post("", response_model=DiaryResponse)
+async def create_diary(
+    diary_data: DiaryCreate = Depends(DiaryCreate.as_form),
+    file: List[UploadFile] = File(default=None),
+    current_user: User = Depends(get_current_user),
+) -> DiaryResponse:
+    try:
+        diary = await diary_service.create_diary(current_user.id, diary_data, file)
+        return diary.to_response()
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.get("", response_model=List[DiaryResponse])
+async def get_user_diaries(
+    skip: int = 0,
+    limit: int = 20,
+    category: Optional[str] = None,
+    current_user: User = Depends(get_current_user),
+) -> List[DiaryResponse]:
+    try:
+        diaries = await diary_service.get_user_diaries(
+            current_user.id, skip, limit, category
+        )
+        return [diary.to_response() for diary in diaries]
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.get("/w/{target_user_id}", response_model=List[DiaryResponse])
+async def get_target_user_diaries(
+    target_user_id: int,
+    skip: int = 0,
+    limit: int = 20,
+    category: Optional[str] = None,
+) -> List[DiaryResponse]:
+    try:
+        diaries = await diary_service.get_user_diaries(
+            target_user_id, skip, limit, category
+        )
+        return [diary.to_response() for diary in diaries]
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.get("/{diary_id}", response_model=DiaryResponse)
+async def get_diary(diary_id: int) -> DiaryResponse:
+    try:
+        diary = await diary_service.get_diary_by_id(diary_id)
+        if not diary:
+            raise HTTPException(status_code=404, detail="Diary not found")
+        return diary.to_response()
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.put("/{diary_id}", response_model=DiaryResponse)
+async def update_diary(
+    diary_id: int,
+    diary_data: DiaryUpdate = Depends(DiaryUpdate.as_form),
+    file: List[UploadFile] = File(default=None),
+    current_user: User = Depends(get_current_user),
+) -> DiaryResponse:
+    try:
+        diary = await diary_service.update_diary(
+            diary_id, current_user.id, diary_data, file
+        )
+        if not diary:
+            raise HTTPException(status_code=404, detail="Diary not found")
+        return diary.to_response()
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.delete("/{diary_id}")
+async def delete_diary(
+    diary_id: int, current_user: User = Depends(get_current_user)
+) -> dict:
+    try:
+        success = await diary_service.delete_diary(diary_id, current_user.id)
+        if not success:
+            raise HTTPException(status_code=404, detail="Diary not found")
+        return {"message": "Diary deleted successfully"}
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
diff --git a/Backend/router/endpoints/friendship.py b/Backend/router/endpoints/friendship.py
new file mode 100644
index 0000000..a3b4beb
--- /dev/null
+++ b/Backend/router/endpoints/friendship.py
@@ -0,0 +1,81 @@
+from fastapi import APIRouter, HTTPException, Depends
+from typing import List, Optional
+from ...schemas.friendship import (
+    FriendshipRequest,
+    FriendshipResponse,
+)
+from ...services.friendship_service import FriendshipService
+from ...core.security import get_current_user
+from ...schemas.user import User
+
+router = APIRouter(prefix="/friendship", tags=["friendship"])
+friendship_service = FriendshipService()
+
+
+@router.post("/request", response_model=FriendshipResponse)
+async def send_friendship_request(
+    request_data: FriendshipRequest, current_user: User = Depends(get_current_user)
+) -> FriendshipResponse:
+    try:
+        friendship = await friendship_service.send_friendship_request(
+            current_user.id, request_data.friend_username
+        )
+        return friendship
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.put("/{friendship_id}/accept", response_model=FriendshipResponse)
+async def accept_friendship_request(
+    friendship_id: int, current_user: User = Depends(get_current_user)
+) -> FriendshipResponse:
+    try:
+        friendship = await friendship_service.accept_friendship_request(
+            friendship_id, current_user.id
+        )
+        if not friendship:
+            raise HTTPException(status_code=404, detail="Friendship request not found")
+        return friendship
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.get("", response_model=List[FriendshipResponse])
+async def get_friendships(
+    status: Optional[str] = None, current_user: User = Depends(get_current_user)
+) -> List[FriendshipResponse]:
+    try:
+        friendships = await friendship_service.get_user_friendships(
+            current_user.id, status
+        )
+        return friendships
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.delete("/{friendship_id}")
+async def delete_friendship(
+    friendship_id: int, current_user: User = Depends(get_current_user)
+) -> dict:
+    try:
+        success = await friendship_service.delete_friendship(
+            friendship_id, current_user.id
+        )
+        if not success:
+            raise HTTPException(status_code=404, detail="Friendship not found")
+        return {"message": "Friendship deleted successfully"}
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.get("/pending", response_model=List[FriendshipResponse])
+async def get_pending_requests(
+    current_user: User = Depends(get_current_user),
+) -> List[FriendshipResponse]:
+    try:
+        pending_requests = await friendship_service.get_pending_requests(
+            current_user.id
+        )
+        return pending_requests
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
diff --git a/Backend/router/endpoints/guestbook.py b/Backend/router/endpoints/guestbook.py
new file mode 100644
index 0000000..9246638
--- /dev/null
+++ b/Backend/router/endpoints/guestbook.py
@@ -0,0 +1,63 @@
+from typing import List
+from fastapi import APIRouter, HTTPException, Depends, status
+from Backend.core.security import get_current_user
+from Backend.schemas.guestbook import (
+    GuestBookCreate,
+    GuestbookUpdate,
+    GuestbookResponse,
+)
+from Backend.schemas.user import User
+from Backend.services.guestbook_service import GuestbookService
+
+router = APIRouter(prefix="/guestbook", tags=["guestbook"])
+
+guestbook_service = GuestbookService()
+
+
+@router.post("", status_code=status.HTTP_201_CREATED, response_model=GuestbookResponse)
+async def create_guestbook(
+    guestbook: GuestBookCreate, current_user: User = Depends(get_current_user)
+) -> GuestbookResponse:
+    try:
+        response = await guestbook_service.create_guestbook(guestbook, current_user)
+        return response
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.get("/{target_user_id}", response_model=List[GuestbookResponse])
+async def get_guestbook(target_user_id: int):
+    try:
+        response = await guestbook_service.get_target_user_guestbooks(target_user_id)
+        response.reverse()
+        return response
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.put("/{id}", response_model=GuestbookResponse)
+async def update_guestbook(
+    id: int,
+    guestbook: GuestbookUpdate,
+) -> GuestbookResponse:
+    try:
+        response = await guestbook_service.update_guestbook_by_id(id, guestbook.content)
+        return response
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.delete("/{id}")
+async def delete_guestbook(
+    id: int,
+    user: User = Depends(get_current_user),
+) -> dict:
+    try:
+        is_success = await guestbook_service.delete_guestbook_by_id(id, user.id)
+        if is_success:
+            return {"detail": "success"}
+        else:
+            raise HTTPException(status_code=404, detail="guestbook not found")
+
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
diff --git a/Backend/router/endpoints/letter.py b/Backend/router/endpoints/letter.py
new file mode 100644
index 0000000..ee784e6
--- /dev/null
+++ b/Backend/router/endpoints/letter.py
@@ -0,0 +1,79 @@
+# from fastapi import APIRouter, HTTPException, Depends
+#
+# from ...schemas.letter import LetterCreate, LetterResponse, EmailRequest
+# from ...services.letter_service import LetterService
+# from ...core.security import get_current_user
+# from ...schemas.user import User
+#
+# router = APIRouter(prefix="/letter", tags=["letter"])
+# letter_service = LetterService()
+#
+#
+# @router.post("", response_model=LetterResponse)
+# async def create_letter(
+#     letter_data: LetterCreate,
+#     current_user: User = Depends(get_current_user),
+# ) -> LetterResponse:
+#     try:
+#         letter = await letter_service.create_letter(current_user.id, letter_data)
+#         return letter.to_response()
+#     except Exception as e:
+#         raise HTTPException(status_code=400, detail=str(e))
+#
+#
+# @router.get("/{letter_id}", response_model=LetterResponse)
+# async def get_letter(
+#     letter_id: int, current_user: User = Depends(get_current_user)
+# ) -> LetterResponse:
+#     try:
+#         letter = await letter_service.get_letter_by_id(letter_id, current_user.id)
+#         if not letter:
+#             raise HTTPException(status_code=404, detail="Letter not found")
+#         return letter.to_response()
+#     except Exception as e:
+#         raise HTTPException(status_code=400, detail=str(e))
+#
+#
+# @router.delete("/{letter_id}")
+# async def delete_letter(letter_id: int, current_user: User = Depends(get_current_user)):
+#     try:
+#         is_success = await letter_service.delete_letter(letter_id, current_user.id)
+#         if not is_success:
+#             raise HTTPException(status_code=404, detail="Letter not found")
+#         return {"detail": "Letter deleted"}
+#     except Exception as e:
+#         raise HTTPException(status_code=400, detail=str(e))
+#
+#
+# @router.put("/{letter_id}", response_model=LetterResponse)
+# async def update_letter(
+#     letter_id: int,
+#     letter_data: LetterCreate,
+#     current_user: User = Depends(get_current_user),
+# ):
+#     try:
+#         letter = await letter_service.update_letter(
+#             letter_id, current_user.id, letter_data.content
+#         )
+#         if not letter:
+#             raise HTTPException(status_code=404, detail="Letter not found")
+#         return letter.to_response()
+#     except Exception as e:
+#         raise HTTPException(status_code=400, detail=str(e))
+#
+#
+# @router.post("/{letter_id}/send")
+# async def send_letter(
+#     letter_id: int,
+#     letter_data: EmailRequest,
+#     current_user: User = Depends(get_current_user),
+# ):
+#     try:
+#         letter = await letter_service.get_letter_by_id(letter_id, current_user.id)
+#         if not letter:
+#             raise HTTPException(status_code=404, detail="Letter not found")
+#
+#         await letter_service.send_letter(letter, letter_data)
+#         return {"message": "Email sent successfully!"}
+#     except Exception as e:
+#         raise HTTPException(status_code=400, detail=str(e))
diff --git a/Backend/router/endpoints/photo.py b/Backend/router/endpoints/photo.py
new file mode 100644
index 0000000..412ed79
--- /dev/null
+++ b/Backend/router/endpoints/photo.py
@@ -0,0 +1,117 @@
+# from fastapi import APIRouter, HTTPException, Depends, UploadFile, File, Query, Form
+# from typing import List
+# from ...schemas.photo import (
+#     PhotoUpload,
+#     PhotoResponse,
+#     CommentCreate,
+#     CommentResponse,
+#     FilterRequest,
+# )
+# from ...services.photo_service import PhotoService
+# from ...core.security import get_current_user
+# from ...schemas.user import User
+# from pydantic import ValidationError
+#
+# router = APIRouter(prefix="/photo", tags=["photo"])
+# photo_service = PhotoService()
+#
+#
+# @router.post("/upload", response_model=PhotoResponse)
+# async def upload_photo(
+#     photo_data: UploadFile = Form(...),
+#     file: UploadFile = File(...),
+#     current_user: User = Depends(get_current_user),
+# ) -> PhotoResponse:
+#     import json
+#
+#     try:
+#         photo_data_bytes = await photo_data.read()
+#         photo_info = json.loads(photo_data_bytes.decode("utf-8"))
+#         photo_data = PhotoUpload(**photo_info)
+#     except (json.JSONDecodeError, ValidationError) as e:
+#         raise HTTPException(status_code=400, detail="Invalid photo data format")
+#     try:
+#         photo = await photo_service.upload_photo(current_user.id, photo_data, file)
+#         return photo.to_response()
+#     except Exception as e:
+#         raise HTTPException(status_code=400, detail=str(e))
+#
+#
+# @router.get("", response_model=List[PhotoResponse])
+# async def get_user_photos(
+#     skip: int = 0,
+#     limit: int = 20,
+#     album_name: str = None,
+#     current_user: User = Depends(get_current_user),
+# ) -> List[PhotoResponse]:
+#     try:
+#         photos = await photo_service.get_user_photos(
+#             current_user.id, skip, limit, album_name
+#         )
+#         return [photo.to_response() for photo in photos]
+#     except Exception as e:
+#         raise HTTPException(status_code=400, detail=str(e))
+#
+#
+# @router.post("/{photo_id}/comment", response_model=CommentResponse)
+# async def add_photo_comment(
+#     photo_id: int,
+#     comment_data: CommentCreate,
+#     current_user: User = Depends(get_current_user),
+# ) -> CommentResponse:
+#     try:
+#         is_friend = await photo_service.check_friendship(current_user.id, photo_id)
+#         if not is_friend:
+#             raise HTTPException(
+#                 status_code=403, detail="Only friends can comment on photos"
+#             )
+#
+#         comment = await photo_service.add_comment(
+#             photo_id, current_user.id, comment_data
+#         )
+#         return comment.to_response(current_user.username)
+#     except Exception as e:
+#         raise HTTPException(status_code=400, detail=str(e))
+#
+#
+# @router.get("/{photo_id}/comments", response_model=List[CommentResponse])
+# async def get_photo_comments(
+#     photo_id: int, current_user: User = Depends(get_current_user)
+# ) -> List[CommentResponse]:
+#     try:
+#         comments = await photo_service.get_photo_comments(photo_id)
+#         return comments
+#     except Exception as e:
+#         raise HTTPException(status_code=400, detail=str(e))
+#
+#
+# @router.post("/edit-filter")
+# async def apply_photo_filter(
+#     filter_request: FilterRequest, current_user: User = Depends(get_current_user)
+# ) -> dict:
+#     if filter_request.cover and filter_request.title is None:
+#         raise HTTPException(status_code=400, detail="title must be Not Null")
+#     try:
+#         filtered_image_path = await photo_service.apply_filter(
+#             filter_request.photo_id,
+#             filter_request.filter_type,
+#             current_user.id,
+#             filter_request.cover,
+#             filter_request.title,
+#         )
+#         return {"filtered_image_path": filtered_image_path}
+#     except Exception as e:
+#         raise HTTPException(status_code=400, detail=str(e))
+#
+#
+# @router.delete("/{photo_id}")
+# async def delete_photo(
+#     photo_id: int, current_user: User = Depends(get_current_user)
+# ) -> dict:
+#     try:
+#         success = await photo_service.delete_photo(photo_id, current_user.id)
+#         if not success:
+#             raise HTTPException(status_code=404, detail="Photo not found")
+#         return {"message": "Photo deleted successfully"}
+#     except Exception as e:
+#         raise HTTPException(status_code=400, detail=str(e))
diff --git a/Backend/router/endpoints/room.py b/Backend/router/endpoints/room.py
new file mode 100644
index 0000000..d654ea3
--- /dev/null
+++ b/Backend/router/endpoints/room.py
@@ -0,0 +1,110 @@
+from fastapi import APIRouter, Depends, HTTPException
+from typing import List
+from Backend.schemas.room import (
+    FurnitureItem,
+    RoomFurniturePlacement,
+    FurniturePlacementRequest,
+    RoomNameUpdateRequest,
+    UpdateRoomTypeRequest,
+    RoomResponse,
+    RoomTypeResponse,
+    RoomFurnitureResponse,
+)
+from Backend.schemas.user import User
+from Backend.core.security import get_current_user
+from Backend.services.room_service import RoomService
+
+router = APIRouter(prefix="/room", tags=["room"])
+room_service = RoomService()
+
+
+@router.get("/catalog", response_model=List[FurnitureItem])
+async def get_furniture_catalog() -> List[FurnitureItem]:
+    return await room_service.get_furniture_catalog()
+
+
+@router.get("/layout", response_model=RoomFurnitureResponse)
+async def get_my_room_layout(current_user: User = Depends(get_current_user)):
+    room_id = await room_service.get_or_create_room(current_user.id)
+    return await room_service.get_room_furnitures(room_id)
+
+
+@router.get("/layout/{user_id}", response_model=RoomFurnitureResponse)
+async def get_user_room_layout(user_id: int) -> RoomFurnitureResponse:
+    room_id = await room_service.get_or_create_room(user_id)
+    return await room_service.get_room_furnitures(room_id)
+
+
+@router.post("/furniture")
+async def place_furniture(
+    request: FurniturePlacementRequest, current_user: User = Depends(get_current_user)
+):
+    room_id = await room_service.get_or_create_room(current_user.id)
+    try:
+        await room_service.place_furniture(room_id, request)
+        return {"message": "Furniture placed successfully"}
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.delete("/furniture")
+async def remove_furniture(
+    x: int, y: int, furniture_name: str, current_user: User = Depends(get_current_user)
+):
+    room_id = await room_service.get_or_create_room(current_user.id)
+    await room_service.remove_furniture(room_id, x, y, furniture_name)
+    return {"message": "Furniture removed successfully"}
+
+
+@router.put("/")
+async def update_room_name(
+    data: RoomNameUpdateRequest, current_user: User = Depends(get_current_user)
+):
+    try:
+        room_id = await room_service.get_or_create_room(current_user.id)
+        await room_service.update_room_name(room_id, data.new_name)
+        return {"message": "Room name updated successfully"}
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.get("/")
+async def get_my_room(current_user: User = Depends(get_current_user)) -> RoomResponse:
+    try:
+        room_id = await room_service.get_or_create_room(current_user.id)
+        return (await room_service.get_room_by_id(room_id)).to_response()
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.get("/types")
+async def get_room_types() -> List[RoomTypeResponse]:
+    return await room_service.get_room_types()
+
+
+@router.patch("/")
+async def update_room_type(
+    data: UpdateRoomTypeRequest, current_user: User = Depends(get_current_user)
+) -> RoomResponse:
+    try:
+        room_id = await room_service.get_or_create_room(current_user.id)
+        return (await room_service.update_room_type(room_id, data.type)).to_response()
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.get("/my")
+async def get_my_furniture(current_user: User = Depends(get_current_user)):
+    try:
+        list_ = await room_service.get_user_furniture(current_user.id)
+        return list_
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+    
+@router.get("/{user_id}", response_model=RoomResponse)
+async def get_room_by_userId(user_id: int) -> RoomResponse:
+    try:
+        room = await room_service.get_room_by_userId(user_id)
+        return room.to_response()
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
\ No newline at end of file
diff --git a/Backend/router/endpoints/store.py b/Backend/router/endpoints/store.py
new file mode 100644
index 0000000..b2f79fa
--- /dev/null
+++ b/Backend/router/endpoints/store.py
@@ -0,0 +1,48 @@
+from fastapi import APIRouter, Depends, HTTPException
+from ...core.security import get_current_user
+from ...schemas.user import User
+from Backend.services.store_service import StoreService
+from ...services.room_service import RoomService
+
+router = APIRouter(prefix="/store", tags=["store"])
+store_service = StoreService()
+room_service = RoomService()
+
+
+@router.get("")
+async def get_dotory(
+    current_user: User = Depends(get_current_user),
+):
+    try:
+        dotory = await store_service.get_dotory_by_id(current_user.id)
+        return {"dotory": dotory}
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.post("/{product_id}")
+async def buy_product(
+    product_id: int,
+    product_name: str,
+    current_user: User = Depends(get_current_user),
+):
+    try:
+        response = await store_service.buy_product(product_id, current_user.id)
+        if response["isSuccess"]:
+            await room_service.add_furniture(current_user.id, product_name)
+            return {"dotory": response["dotory"]}
+        raise HTTPException(status_code=404, detail="Product not found")
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
+
+
+@router.put("")
+async def update_dotory(
+    dotory_num: int,
+    current_user: User = Depends(get_current_user),
+):
+    try:
+        dotory = await store_service.update_user_dotory(current_user.id, dotory_num)
+        return {"dotory": dotory}
+    except Exception as e:
+        raise HTTPException(status_code=400, detail=str(e))
diff --git a/Backend/router/endpoints/user.py b/Backend/router/endpoints/user.py
new file mode 100644
index 0000000..37078cd
--- /dev/null
+++ b/Backend/router/endpoints/user.py
@@ -0,0 +1,116 @@
+from typing import List
+
+from fastapi import APIRouter, HTTPException, status, UploadFile, File, Depends
+from Backend.schemas.user import UserCreate, UserLogin, UserResponse, User, UserUpdate
+from Backend.services.user_service import UserService
+from Backend.core.security import create_access_token, get_current_user
+
+router = APIRouter(prefix="/user", tags=["user"])
+
+user_service = UserService()
+
+
+@router.post(
+    "/register", response_model=UserResponse, status_code=status.HTTP_201_CREATED
+)
+async def register_user(
+    user_data: UserCreate = Depends(UserCreate.as_form),
+    profile_file: UploadFile = File(default=None),
+) -> UserResponse:
+    existing_user = # 작성 #
+    if existing_user:
+        raise HTTPException(
+            status_code=# 작성 #
+            detail="# 작성 #"
+        )
+
+    existing_email = # 작성 #
+    if existing_email:
+        raise HTTPException(
+            status_code=# 작성 #
+            detail="# 작성 #"
+        )
+
+    try:
+        user = # 작성 #
+        return user.to_response()
+    except Exception as e:
+        raise HTTPException(
+            status_code=
+            detail="# 작성 #"
+        )
+
+@router.post("/login")
+async def login_user(login_data: UserLogin) -> dict:
+    user = await user_service.authenticate_user(
+        
+    )
+
+    if not user:
+        raise HTTPException(
+            status_code=
+            detail=
+        )
+
+    if not user.is_active:
+        raise HTTPException(
+            status_code=, detail=""
+        )
+
+    access_token = 
+
+    return {"access_token": access_token, "token_type": "bearer"}
+
+
+
+@router.get("/profile/{username}", response_model=UserResponse)
+async def get_user_profile(username: str) -> UserResponse:
+    user = await user_service.get_user_by_username(username)
+
+    if not user:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND, detail="User not found"
+        )
+
+    return user.to_response()
+
+
+@router.get("/me", response_model=UserResponse)
+async def get_user_me(user: User = Depends(get_current_user)) -> UserResponse:
+    return user.to_response()
+
+
+@router.delete("/{username}")
+async def delete_user(username: str) -> dict:
+    is_success = await user_service.delete_user(username)
+    if not is_success:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND, detail="User not found"
+        )
+    return {"detail": "User deleted"}
+
+
+@router.get("/find/{username}", response_model=List[UserResponse])
+async def find_user(username: str) -> List[UserResponse]:
+    users = await user_service.find_user(username)
+    return users
+
+
+@router.put("/", response_model=UserResponse)
+async def update_user(
+    current_user: User = Depends(get_current_user),
+    user_data: UserUpdate = Depends(UserUpdate.as_form),
+    profile_file: UploadFile = File(default=None),
+) -> UserResponse:
+    try:
+        updated_user = await user_service.update_user(
+            user=current_user, user_data=user_data, profile_file=profile_file
+        )
+        return updated_user.to_response()
+    except ValueError as e:
+        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))
+    except Exception as e:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail=f"Failed to update user: {str(e)}",
+        )
diff --git a/Backend/router/router.py b/Backend/router/router.py
new file mode 100644
index 0000000..dadeafe
--- /dev/null
+++ b/Backend/router/router.py
@@ -0,0 +1,21 @@
+import os
+import traceback
+from fastapi import APIRouter
+from fastapi.logger import logger
+
+
+router = APIRouter()
+
+for router_file in os.listdir("Backend/router/endpoints"):
+    try:
+        if router_file.endswith(".py"):
+            module_name = "Backend.router.endpoints." + router_file[:-3]
+            module = __import__(module_name, fromlist=[""])
+            router_object = getattr(module, "router")
+            prefix = getattr(module, "prefix", router_file[:-3])
+
+            router.include_router(router_object, prefix="/api", tags=[router_file[:-3]])
+            print(f"Loaded router: /api/{prefix} - {router_file}")
+
+    except Exception as e:
+        logger.error(f"Error loading router {router_file}:\n{traceback.format_exc()}")
diff --git a/Backend/schemas/__init__.py b/Backend/schemas/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/Backend/schemas/avatar.py b/Backend/schemas/avatar.py
new file mode 100644
index 0000000..5a4e3ad
--- /dev/null
+++ b/Backend/schemas/avatar.py
@@ -0,0 +1,106 @@
+from pydantic import BaseModel
+import enum
+
+
+class AvatarType(str, enum.Enum):
+    MALE = "남성"
+    FEMALE = "여성"
+
+
+class TopClothesType(str, enum.Enum):
+    SCHOOL_CLOTHES = "교복"
+    SCHOOL_CLOTHES_2 = "교복 조끼"
+    ANA_CLOTHES = "AnA 동잠"
+    SUSPENDERS_CLOTHES_1 = "멜빵 바지"
+    SUSPENDERS_CLOTHES_2 = "멜빵 치마"
+    RAINBOW_CLOTHES = "무지개 맨투맨"
+    SANTA_CLOTHES = "산타"
+
+
+class BottomClothesType(str, enum.Enum):
+    SCHOOL_CLOTHES = "교복 바지"
+    SCHOOL_CLOTHES_2 = "교복 치마"
+    SCHOOL_CLOTHES_3 = "교복 조끼 바지"
+    SCHOOL_CLOTHES_4 = "교복 조끼 치마"
+    SANTA_CLOTHES = "산타 바지"
+    JEANS = "청바지"
+
+
+avatar_path_ = {"남성": "public/avatar/남자.png", "여성": "public/avatar/여자.png"}
+top_clothe_path_ = {
+    "교복": "public/avatar/교복상의.png",
+    "교복 조끼": "public/avatar/교복조끼상의.png",
+    "AnA 동잠": "public/avatar/동잠상의.png",
+    "멜빵 바지": "public/avatar/멜빵바지상의.png",
+    "멜빵 치마": "public/avatar/멜빵치마상의.png",
+    "무지개 맨투맨": "public/avatar/무지개맨투맨상의.png",
+    "산타": "public/avatar/산타상의.png",
+}
+bottom_clothe_path_ = {
+    "교복 바지": "public/avatar/교복하의남.png",
+    "교복 치마": "public/avatar/교복하의여.png",
+    "교복 조끼 바지": "public/avatar/교복조끼하의남.png",
+    "교복 조끼 치마": "public/avatar/교복조끼하의여.png",
+    "산타 바지": "public/avatar/산타하의.png",
+    "청바지": "public/avatar/청바지하의.png",
+}
+
+
+class AvatarTypeResponse(BaseModel):
+    name: str
+    path: str
+
+
+class AvatarUpdate(BaseModel):
+    avatar_type: AvatarType
+    top_clothe_type: TopClothesType
+    bottom_clothe_type: BottomClothesType
+
+
+class AvatarResponse(BaseModel):
+    id: int
+    user_id: int
+    avatar_type: AvatarTypeResponse
+    top_clothe_type: AvatarTypeResponse
+    bottom_clothe_type: AvatarTypeResponse
+
+
+class AvatarOptions(BaseModel):
+    avatar_types: list[str]
+    top_clothe_types: list[str]
+    bottom_clothe_types: list[str]
+
+
+
+class Avatar:
+    def __init__(
+        self,
+        id: int,
+        user_id: int,
+        avatar_type: AvatarType,
+        top_clothe_type: TopClothesType,
+        bottom_clothe_type: BottomClothesType,
+    ):
+        self.id = id
+        self.user_id = user_id
+        self.avatar_type = avatar_type
+        self.top_clothe_type = top_clothe_type
+        self.bottom_clothe_type = bottom_clothe_type
+
+    def to_response(self) -> AvatarResponse:
+        return AvatarResponse(
+            id=self.id,
+            user_id=self.user_id,
+            avatar_type=AvatarTypeResponse(
+                name=self.avatar_type,
+                path=avatar_path_[self.avatar_type],
+            ),
+            top_clothe_type=AvatarTypeResponse(
+                name=self.top_clothe_type,
+                path=top_clothe_path_[self.top_clothe_type],
+            ),
+            bottom_clothe_type=AvatarTypeResponse(
+                name=self.bottom_clothe_type,
+                path=bottom_clothe_path_[self.bottom_clothe_type],
+            ),
+        )
diff --git a/Backend/schemas/diary.py b/Backend/schemas/diary.py
new file mode 100644
index 0000000..cf2d9d1
--- /dev/null
+++ b/Backend/schemas/diary.py
@@ -0,0 +1,109 @@
+from pydantic import BaseModel, field_validator
+from datetime import datetime
+from typing import Optional, List
+from fastapi import Form
+
+
+class DiaryCreate(BaseModel):
+    title: str
+    content: str
+    category: str
+
+    @classmethod
+    def as_form(
+        cls,
+        title: str = Form(...),
+        content: str = Form(...),
+        category: str = Form(...),
+    ) -> "DiaryCreate":
+        return cls(title=title, content=content, category=category)
+
+    @field_validator("title")
+    @classmethod
+    def validate_title(cls, v):
+        if len(v.strip()) < 1:
+            raise ValueError("Title cannot be empty")
+        if len(v) > 100:
+            raise ValueError("Title must be less than 100 characters")
+        return v.strip()
+
+    @field_validator("content")
+    @classmethod
+    def validate_content(cls, v):
+        if len(v.strip()) < 1:
+            raise ValueError("Content cannot be empty")
+        if len(v) > 5000:
+            raise ValueError("Content must be less than 5000 characters")
+        return v.strip()
+
+
+class DiaryUpdate(BaseModel):
+    title: Optional[str] = None
+    content: Optional[str] = None
+    category: Optional[str] = None
+
+    @classmethod
+    def as_form(
+        cls,
+        title: Optional[str] = Form(None),
+        content: Optional[str] = Form(None),
+        category: Optional[str] = Form(None),
+    ) -> "DiaryUpdate":
+        return cls(title=title, content=content, category=category)
+
+
+class DiaryResponse(BaseModel):
+    id: int
+    user_id: int
+    title: str
+    content: str
+    images: List[str]
+    category: str
+    created_at: datetime
+    is_submitted: bool
+    email_sent: bool
+
+
+class Diary:
+    def __init__(
+        self,
+        id: int,
+        user_id: int,
+        title: str,
+        content: str,
+        images: str,  # JSON string
+        category: str,
+        created_at: datetime,
+        is_submitted: bool = False,
+        email_sent: bool = False,
+    ):
+        self.id = id
+        self.user_id = user_id
+        self.title = title
+        self.content = content
+        self.images = images
+        self.category = category
+        self.created_at = created_at
+        self.is_submitted = is_submitted
+        self.email_sent = email_sent
+
+    @property
+    def image_list(self) -> List[str]:
+        return (
+            [img.strip() for img in self.images.split(",") if img.strip()]
+            if self.images
+            else []
+        )
+
+    def to_response(self) -> DiaryResponse:
+        return DiaryResponse(
+            id=self.id,
+            user_id=self.user_id,
+            title=self.title,
+            content=self.content,
+            images=self.image_list,
+            category=self.category,
+            created_at=self.created_at,
+            is_submitted=self.is_submitted,
+            email_sent=self.email_sent,
+        )
diff --git a/Backend/schemas/friendship.py b/Backend/schemas/friendship.py
new file mode 100644
index 0000000..a747653
--- /dev/null
+++ b/Backend/schemas/friendship.py
@@ -0,0 +1,59 @@
+from pydantic import BaseModel, field_validator
+from datetime import datetime
+import enum
+
+
+class FriendshipStatus(str, enum.Enum):
+    PENDING = "pending"
+    ACCEPTED = "accepted"
+    REJECTED = "rejected"
+
+
+class FriendshipRequest(BaseModel):
+    friend_username: str
+
+    @field_validator("friend_username")
+    @classmethod
+    def validate_friend_username(cls, v):
+        if len(v.strip()) < 1:
+            raise ValueError("Friend username cannot be empty")
+        return v.strip()
+
+
+class FriendshipResponse(BaseModel):
+    id: int
+    user_id: int
+    friend_id: int
+    friend_username: str
+    status: FriendshipStatus
+    created_at: datetime
+
+
+class FriendshipUpdate(BaseModel):
+    status: FriendshipStatus
+
+
+class Friendship:
+    def __init__(
+        self,
+        id: int,
+        user_id: int,
+        friend_id: int,
+        status: str,
+        created_at: datetime,
+    ):
+        self.id = id
+        self.user_id = user_id
+        self.friend_id = friend_id
+        self.status = status
+        self.created_at = created_at
+
+    def to_response(self, friend_username: str) -> FriendshipResponse:
+        return FriendshipResponse(
+            id=self.id,
+            user_id=self.user_id,
+            friend_id=self.friend_id,
+            friend_username=friend_username,
+            status=FriendshipStatus(self.status),
+            created_at=self.created_at,
+        )
diff --git a/Backend/schemas/guestbook.py b/Backend/schemas/guestbook.py
new file mode 100644
index 0000000..4472367
--- /dev/null
+++ b/Backend/schemas/guestbook.py
@@ -0,0 +1,46 @@
+from datetime import datetime
+from pydantic import BaseModel, field_validator
+
+
+class GuestBookCreate(BaseModel):
+    content: str
+    target_user_id: int
+
+    @field_validator("content")
+    @classmethod
+    def validate_content(cls, v):
+        if len(v.strip()) < 1:
+            raise ValueError("GuestBook content cannot be empty")
+        if len(v) > 2000:
+            raise ValueError("GuestBook content must be less than 2000 characters")
+        return v.strip()
+
+
+class GuestbookUpdate(BaseModel):
+    content: str
+
+
+class GuestbookResponse(BaseModel):
+    id: int
+    content: str
+    target_user_id: int
+    user_id: int
+    user_profile_path: str
+    username: str
+    created_at: datetime
+
+
+class GuestBook:
+    def __init__(
+        self,
+        id: int,
+        target_user_id: int,
+        user_id,
+        content,
+        created_at: datetime,
+    ):
+        self.id = id
+        self.target_user_id = target_user_id
+        self.user_id = user_id
+        self.content = content
+        self.created_at = created_at
diff --git a/Backend/schemas/letter.py b/Backend/schemas/letter.py
new file mode 100644
index 0000000..400366d
--- /dev/null
+++ b/Backend/schemas/letter.py
@@ -0,0 +1,47 @@
+# from pydantic import BaseModel, field_validator, EmailStr
+#
+# # email validator 삭제 및 EmailStr 사용
+#
+#
+# class LetterCreate(BaseModel):
+#     content: str
+#
+#     @field_validator("content")
+#     @classmethod
+#     def validate_content(cls, v):
+#         if len(v.strip()) < 1:
+#             raise ValueError("Letter content cannot be empty")
+#         if len(v) > 2000:
+#             raise ValueError("Letter content must be less than 2000 characters")
+#         return v.strip()
+#
+#
+# class LetterResponse(BaseModel):
+#     id: int
+#     sender_id: int
+#     content: str
+#
+#
+# class Letter:
+#     def __init__(
+#         self,
+#         id: int,
+#         sender_id: int,
+#         content: str,
+#     ):
+#         self.id = id
+#         self.sender_id = sender_id
+#         self.content = content
+#
+#     def to_response(self) -> LetterResponse:
+#         return LetterResponse(
+#             id=self.id,
+#             sender_id=self.sender_id,
+#             content=self.content,
+#         )
+#
+#
+# class EmailRequest(BaseModel):
+#     sender_email: EmailStr
+#     sender_password: str
+#     sender_name: str
diff --git a/Backend/schemas/photo.py b/Backend/schemas/photo.py
new file mode 100644
index 0000000..234b1db
--- /dev/null
+++ b/Backend/schemas/photo.py
@@ -0,0 +1,117 @@
+# from pydantic import BaseModel, field_validator
+# from datetime import datetime
+#
+#
+# class PhotoUpload(BaseModel):
+#     album_name: str
+#     title: str
+#
+#     @field_validator("album_name")
+#     @classmethod
+#     def validate_album_name(cls, v):
+#         if len(v.strip()) < 1:
+#             raise ValueError("Album name cannot be empty")
+#         if len(v) > 50:
+#             raise ValueError("Album name must be less than 50 characters")
+#         return v.strip()
+#
+#     @field_validator("title")
+#     @classmethod
+#     def validate_title(cls, v):
+#         if len(v.strip()) < 1:
+#             raise ValueError("Title cannot be empty")
+#         if len(v) > 100:
+#             raise ValueError("Title must be less than 100 characters")
+#         return v.strip()
+#
+#
+# class PhotoResponse(BaseModel):
+#     id: int
+#     user_id: int
+#     album_name: str
+#     image_path: str
+#     title: str
+#     created_at: datetime
+#
+#
+# class CommentCreate(BaseModel):
+#     content: str
+#
+#     @field_validator("content")
+#     @classmethod
+#     def validate_content(cls, v):
+#         if len(v.strip()) < 1:
+#             raise ValueError("Comment cannot be empty")
+#         if len(v) > 500:
+#             raise ValueError("Comment must be less than 500 characters")
+#         return v.strip()
+#
+#
+# class CommentResponse(BaseModel):
+#     id: int
+#     photo_id: int
+#     user_id: int
+#     username: str
+#     content: str
+#     created_at: datetime
+#
+#
+# class FilterRequest(BaseModel):
+#     photo_id: int
+#     filter_type: str
+#     cover: bool
+#     title: str = None
+#
+#
+# class Photo:
+#     def __init__(
+#         self,
+#         id: int,
+#         user_id: int,
+#         album_name: str,
+#         image_path: str,
+#         title: str,
+#         created_at: datetime,
+#     ):
+#         self.id = id
+#         self.user_id = user_id
+#         self.album_name = album_name
+#         self.image_path = image_path
+#         self.title = title
+#         self.created_at = created_at
+#
+#     def to_response(self) -> PhotoResponse:
+#         return PhotoResponse(
+#             id=self.id,
+#             user_id=self.user_id,
+#             album_name=self.album_name,
+#             image_path=self.image_path,
+#             title=self.title,
+#             created_at=self.created_at,
+#         )
+#
+#
+# class PhotoComment:
+#     def __init__(
+#         self,
+#         id: int,
+#         photo_id: int,
+#         user_id: int,
+#         content: str,
+#         created_at: datetime,
+#     ):
+#         self.id = id
+#         self.photo_id = photo_id
+#         self.user_id = user_id
+#         self.content = content
+#         self.created_at = created_at
+#
+#     def to_response(self, username: str) -> CommentResponse:
+#         return CommentResponse(
+#             id=self.id,
+#             photo_id=self.photo_id,
+#             user_id=self.user_id,
+#             username=username,
+#             content=self.content,
+#             created_at=self.created_at,
+#         )
diff --git a/Backend/schemas/room.py b/Backend/schemas/room.py
new file mode 100644
index 0000000..c9381f6
--- /dev/null
+++ b/Backend/schemas/room.py
@@ -0,0 +1,296 @@
+import enum
+from pydantic import BaseModel, field_validator
+from typing import Optional, List
+
+
+class RoomNameUpdateRequest(BaseModel):
+    new_name: str
+
+
+class RoomTypes(enum.Enum):
+    ROOM_1 = "room_1"
+    ROOM_2 = "room_2"
+
+
+class UpdateRoomTypeRequest(BaseModel):
+    type: RoomTypes
+
+
+class RoomTypeResponse(BaseModel):
+    type: str
+    image_path: str
+
+
+class RoomResponse(BaseModel):
+    id: int
+    user_id: int
+    room_name: str
+    room_type: RoomTypes
+    room_image_path: str
+
+
+room_path = {
+    "room_1": "public/room/room_1.png",
+    "room_2": "public/room/room_2.png",
+}
+
+
+class FurnitureItem(BaseModel):
+    name: str
+    image_path: str
+    width: int
+
+
+class Furniture(str, enum.Enum):
+    BLACK_LAPTOP1_0 = "검정 노트북1-01"
+    BLACK_LAPTOP1_180 = "검정 노트북1-1801"
+    BLACK_LAPTOP1_270 = "검정 노트북1-2701"
+    BLACK_LAPTOP1_90 = "검정 노트북1-901"
+    BLACK_LAPTOP2_0 = "검정 노트북2-01"
+    BLACK_LAPTOP2_180 = "검정 노트북2-1801"
+    BLACK_LAPTOP2_270 = "검정 노트북2-2701"
+    BLACK_LAPTOP2_90 = "검정 노트북2-901"
+    BLACK_LAPTOP3_0 = "검정 노트북3-01"
+    BLACK_LAPTOP3_180 = "검정 노트북3-1801"
+    BLACK_LAPTOP3_270 = "검정 노트북3-2701"
+    BLACK_LAPTOP3_90 = "검정 노트북3-901"
+    WOODEN_TABLE_90 = "나무 탁자-901"
+    WOODEN_TABLE_0 = "나무 탁자-01"
+    LAPTOP1_0 = "노트북1-01"
+    LAPTOP1_180 = "노트북1-1801"
+    LAPTOP1_270 = "노트북1-2701"
+    LAPTOP1_90 = "노트북1-901"
+    LAPTOP2_0 = "노트북2-01"
+    LAPTOP2_180 = "노트북2-1801"
+    LAPTOP2_270 = "노트북2-2701"
+    LAPTOP2_90 = "노트북2-901"
+    LAPTOP3_0 = "노트북3-01"
+    LAPTOP3_180 = "노트북3-1801"
+    LAPTOP3_270 = "노트북3-2701"
+    LAPTOP3_90 = "노트북3-901"
+    GREEN_TABLE = "녹색 탁자1"
+    MINI_FRIDGE_0 = "미니 냉장고-01"
+    MINI_FRIDGE_180 = "미니 냉장고-1801"
+    MINI_FRIDGE_90 = "미니 냉장고-901"
+    BOX_0 = "박스-01"
+    BOX_90 = "박스-901"
+    PINK_TABLE = "분홍색 탁자1"
+    SHELF_0 = "선반-01"
+    SHELF_180 = "선반-1801"
+    SHELF_270 = "선반-2701"
+    SHELF_90 = "선반-901"
+    TRASH_CAN_CLOSED = "쓰레기통 닫힘1"
+    TRASH_CAN_OPEN = "쓰레기통 열림1"
+    FISHBOWL_0 = "어항-01"
+    FISHBOWL_180 = "어항-1801"
+    FISHBOWL_270 = "어항-2701"
+    FISHBOWL_90 = "어항-901"
+    BEVERAGE_FRIDGE_0 = "음료 냉장고-01"
+    BEVERAGE_FRIDGE_180 = "음료 냉장고-1801"
+    BEVERAGE_FRIDGE_270 = "음료 냉장고-2701"
+    BEVERAGE_FRIDGE_90 = "음료 냉장고-901"
+    CHAIR_0 = "의자-01"
+    CHAIR_180 = "의자-1801"
+    CHAIR_270 = "의자-2701"
+    CHAIR_90 = "의자-901"
+    SMALL_SHELF_0 = "작은 선반-01"
+    SMALL_SHELF_180 = "작은 선반-1801"
+    SMALL_SHELF_270 = "작은 선반-2701"
+    SMALL_SHELF_90 = "작은 선반-901"
+    SMALL_PLANT = "작은 식물1"
+    BOOKSHELF_0 = "책장-01"
+    BOOKSHELF_180 = "책장-1801"
+    BOOKSHELF_270 = "책장-2701"
+    BOOKSHELF_90 = "책장-901"
+    LARGE_PLANT = "큰 식물1"
+    TV_0 = "티비-01"
+    TV_180 = "티비-1801"
+    TV_270 = "티비-2701"
+    TV_90 = "티비-901"
+    BLUE_TABLE = "파란색 탁자1"
+    GRAY_TABLE = "회색 탁자1"
+    WHITE_LAPTOP1_0 = "흰 노트북1-01"
+    WHITE_LAPTOP1_180 = "흰 노트북1-1801"
+    WHITE_LAPTOP1_270 = "흰 노트북1-2701"
+    WHITE_LAPTOP1_90 = "흰 노트북1-901"
+    WHITE_LAPTOP2_0 = "흰 노트북2-01"
+    WHITE_LAPTOP2_180 = "흰 노트북2-1801"
+    WHITE_LAPTOP2_270 = "흰 노트북2-2701"
+    WHITE_LAPTOP2_90 = "흰 노트북2-901"
+    WHITE_LAPTOP3_0 = "흰 노트북3-01"
+    WHITE_LAPTOP3_180 = "흰 노트북3-1801"
+    WHITE_LAPTOP3_270 = "흰 노트북3-2701"
+    WHITE_LAPTOP3_90 = "흰 노트북3-901"
+    WHITE_SHELF_0 = "흰색 선반-01"
+    WHITE_SHELF_180 = "흰색 선반-1801"
+    WHITE_SHELF_270 = "흰색 선반-2701"
+    WHITE_SHELF_90 = "흰색 선반-901"
+    WHITE_SMALL_SHELF_0 = "흰색 작은 선반-01"
+    WHITE_SMALL_SHELF_180 = "흰색 작은 선반-1801"
+    WHITE_SMALL_SHELF_270 = "흰색 작은 선반-2701"
+    WHITE_SMALL_SHELF_90 = "흰색 작은 선반-901"
+    WHITE_TABLE = "흰색 탁자1"
+    EMPTY = "1"
+
+
+class RoomFurniturePlacement(BaseModel):
+    id: int
+    room_id: int
+    furniture_name: Furniture
+    x: int
+    y: int
+
+
+class FurniturePlacementRequest(BaseModel):
+    furniture_name: Furniture
+    x: int
+    y: int
+
+    @field_validator("x", "y")
+    @classmethod
+    def validate_coordinates(cls, v):
+        if v < 0 or v >= 10:
+            raise ValueError("position must be between 0 and 10")
+        return v
+
+
+class FurniturePlacementResponse(BaseModel):
+    furniture_name: Furniture
+    x: int
+    y: int
+    image_path: str
+
+
+class RoomFurnitureResponse(BaseModel):
+    room: RoomResponse
+    furniture: List[FurniturePlacementResponse]
+
+
+furniture_path = {
+    "검정 노트북1-01": "public/funiture/검정 노트북1-0.png",
+    "검정 노트북1-1801": "public/funiture/검정 노트북1-180.png",
+    "검정 노트북1-2701": "public/funiture/검정 노트북1-270.png",
+    "검정 노트북1-901": "public/funiture/검정 노트북1-90.png",
+    "검정 노트북2-01": "public/funiture/검정 노트북2-0.png",
+    "검정 노트북2-1801": "public/funiture/검정 노트북2-180.png",
+    "검정 노트북2-2701": "public/funiture/검정 노트북2-270.png",
+    "검정 노트북2-901": "public/funiture/검정 노트북2-90.png",
+    "검정 노트북3-01": "public/funiture/검정 노트북3-0.png",
+    "검정 노트북3-1801": "public/funiture/검정 노트북3-180.png",
+    "검정 노트북3-2701": "public/funiture/검정 노트북3-270.png",
+    "검정 노트북3-901": "public/funiture/검정 노트북3-90.png",
+    "나무 탁자-901": "public/funiture/나무 탁자-90.png",
+    "나무 탁자-01": "public/funiture/나무탁자-0.png",
+    "노트북1-01": "public/funiture/노트북1-0.png",
+    "노트북1-1801": "public/funiture/노트북1-180.png",
+    "노트북1-2701": "public/funiture/노트북1-270.png",
+    "노트북1-901": "public/funiture/노트북1-90.png",
+    "노트북2-01": "public/funiture/노트북2-0.png",
+    "노트북2-1801": "public/funiture/노트북2-180.png",
+    "노트북2-2701": "public/funiture/노트북2-270.png",
+    "노트북2-901": "public/funiture/노트북2-90.png",
+    "노트북3-01": "public/funiture/노트북3-0.png",
+    "노트북3-1801": "public/funiture/노트북3-180.png",
+    "노트북3-2701": "public/funiture/노트북3-270.png",
+    "노트북3-901": "public/funiture/노트북3-90.png",
+    "녹색 침대-02": "public/funiture/녹색 침대-0.png",
+    "녹색 침대-1802": "public/funiture/녹색 침대-180.png",
+    "녹색 침대-2702": "public/funiture/녹색 침대-270.png",
+    "녹색 침대-902": "public/funiture/녹색 침대-90.png",
+    "녹색 탁자1": "public/funiture/녹색 탁자.png",
+    "미니 냉장고-01": "public/funiture/미니 냉장고-0.png",
+    "미니 냉장고-1801": "public/funiture/미니 냉장고-180.png",
+    "미니 냉장고-901": "public/funiture/미니 냉장고-90.png",
+    "박스-01": "public/funiture/박스-0.png",
+    "박스-901": "public/funiture/박스-90.png",
+    "분홍색 탁자1": "public/funiture/분홍색 탁자.png",
+    "빨간 침대-02": "public/funiture/빨간 침대-0.png",
+    "빨간 침대-1802": "public/funiture/빨간 침대-180.png",
+    "빨간 침대-2702": "public/funiture/빨간 침대-270.png",
+    "빨간 침대-902": "public/funiture/빨간 침대-90.png",
+    "선반-01": "public/funiture/선반-0.png",
+    "선반-1801": "public/funiture/선반-180.png",
+    "선반-2701": "public/funiture/선반-270.png",
+    "선반-901": "public/funiture/선반-90.png",
+    "소파-02": "public/funiture/소파-0.png",
+    "소파-1802": "public/funiture/소파-180.png",
+    "소파-2702": "public/funiture/소파-270.png",
+    "소파-902": "public/funiture/소파-90.png",
+    "쓰레기통 닫힘1": "public/funiture/쓰레기통닫힘.png",
+    "쓰레기통 열림1": "public/funiture/쓰레기통열림.png",
+    "어항-01": "public/funiture/어항-0.png",
+    "어항-1801": "public/funiture/어항-180.png",
+    "어항-2701": "public/funiture/어항-270.png",
+    "어항-901": "public/funiture/어항-90.png",
+    "음료 냉장고-01": "public/funiture/음료 냉장고-0.png",
+    "음료 냉장고-1801": "public/funiture/음료 냉장고-180.png",
+    "음료 냉장고-2701": "public/funiture/음료 냉장고-270.png",
+    "음료 냉장고-901": "public/funiture/음료 냉장고-90.png",
+    "의자-01": "public/funiture/의자-0.png",
+    "의자-1801": "public/funiture/의자-180.png",
+    "의자-2701": "public/funiture/의자-270.png",
+    "의자-901": "public/funiture/의자-90.png",
+    "작은 선반-01": "public/funiture/작은 선반-0.png",
+    "작은 선반-1801": "public/funiture/작은 선반-180.png",
+    "작은 선반-2701": "public/funiture/작은 선반-270.png",
+    "작은 선반-901": "public/funiture/작은 선반-90.png",
+    "작은 식물1": "public/funiture/작은 식물.png",
+    "주황 침대-02": "public/funiture/주황 침대-0.png",
+    "주황 침대-1802": "public/funiture/주황 침대-180.png",
+    "주황 침대-2702": "public/funiture/주황 침대-270.png",
+    "주황 침대-902": "public/funiture/주황 침대-90.png",
+    "책장-01": "public/funiture/책장-0.png",
+    "책장-1801": "public/funiture/책장-180.png",
+    "책장-2701": "public/funiture/책장-270.png",
+    "책장-901": "public/funiture/책장-90.png",
+    "큰 식물1": "public/funiture/큰 식물.png",
+    "티비-01": "public/funiture/티비-0.png",
+    "티비-1801": "public/funiture/티비-180.png",
+    "티비-2701": "public/funiture/티비-270.png",
+    "티비-901": "public/funiture/티비-90.png",
+    "파란 침대-02": "public/funiture/파란 침대-0.png",
+    "파란 침대-1802": "public/funiture/파란 침대-180.png",
+    "파란 침대-2702": "public/funiture/파란 침대-270.png",
+    "파란 침대-902": "public/funiture/파란 침대-90.png",
+    "파란색 탁자1": "public/funiture/파란색 탁자.png",
+    "회색 탁자1": "public/funiture/회색 탁자.png",
+    "흰 노트북1-01": "public/funiture/흰 노트북1-0.png",
+    "흰 노트북1-1801": "public/funiture/흰 노트북1-180.png",
+    "흰 노트북1-2701": "public/funiture/흰 노트북1-270.png",
+    "흰 노트북1-901": "public/funiture/흰 노트북1-90.png",
+    "흰 노트북2-01": "public/funiture/흰 노트북2-0.png",
+    "흰 노트북2-1801": "public/funiture/흰 노트북2-180.png",
+    "흰 노트북2-2701": "public/funiture/흰 노트북2-270.png",
+    "흰 노트북2-901": "public/funiture/흰 노트북2-90.png",
+    "흰 노트북3-01": "public/funiture/흰 노트북3-0.png",
+    "흰 노트북3-1801": "public/funiture/흰 노트북3-180.png",
+    "흰 노트북3-2701": "public/funiture/흰 노트북3-270.png",
+    "흰 노트북3-901": "public/funiture/흰 노트북3-90.png",
+    "흰색 선반-01": "public/funiture/흰색 선반-0.png",
+    "흰색 선반-1801": "public/funiture/흰색 선반-180.png",
+    "흰색 선반-2701": "public/funiture/흰색 선반-270.png",
+    "흰색 선반-901": "public/funiture/흰색 선반-90.png",
+    "흰색 작은 선반-01": "public/funiture/흰색 작은 선반-0.png",
+    "흰색 작은 선반-1801": "public/funiture/흰색 작은 선반-180.png",
+    "흰색 작은 선반-2701": "public/funiture/흰색 작은 선반-270.png",
+    "흰색 작은 선반-901": "public/funiture/흰색 작은 선반-90.png",
+    "흰색 탁자1": "public/funiture/흰색 탁자.png",
+    "1": "1",
+}
+
+
+class Room:
+    def __init__(self, id: int, user_id: int, room_name: str, room_type: RoomTypes):
+        self.id = id
+        self.user_id = user_id
+        self.room_name = room_name
+        self.room_type = room_type
+
+    def to_response(self) -> RoomResponse:
+        return RoomResponse(
+            id=self.id,
+            user_id=self.user_id,
+            room_name=self.room_name,
+            room_type=self.room_type,
+            room_image_path=room_path[self.room_type],
+        )
diff --git a/Backend/schemas/user.py b/Backend/schemas/user.py
new file mode 100644
index 0000000..1082521
--- /dev/null
+++ b/Backend/schemas/user.py
@@ -0,0 +1,93 @@
+from pydantic import BaseModel, EmailStr
+from datetime import datetime
+from typing import Optional
+import hashlib
+import secrets
+from fastapi import Form
+
+
+class UserCreate(BaseModel):
+    username: str
+    email: EmailStr
+    password: str
+
+    @classmethod
+    def as_form(
+        cls,
+        username: str = Form(...),
+        email: EmailStr = Form(...),
+        password: str = Form(...),
+    ) -> "UserCreate":
+        return cls(username=username, email=email, password=password)
+
+
+class UserUpdate(BaseModel):
+    email: Optional[EmailStr] = None
+    password: Optional[str] = None
+
+    @classmethod
+    def as_form(
+        cls,
+        email: Optional[EmailStr] = Form(default=None),
+        password: Optional[str] = Form(default=None),
+    ) -> "UserUpdate":
+        return cls(email=email, password=password)
+
+
+class UserLogin(BaseModel):
+    username: str
+    password: str
+
+
+class UserResponse(BaseModel):
+    id: int
+    username: str
+    email: str
+    created_at: datetime
+    profile_image_path: str
+    is_active: bool
+
+
+class User:
+    def __init__(
+        self,
+        id: int,
+        username: str,
+        email: str,
+        password_hash: str,
+        salt: str,
+        created_at: datetime,
+        profile_image_path: str,
+        is_active: bool = True,
+    ):
+        self.id = id
+        self.username = username
+        self.email = email
+        self.password_hash = password_hash
+        self.salt = salt
+        self.created_at = created_at
+        self.profile_image_path = profile_image_path
+        self.is_active = is_active
+
+    @staticmethod
+    def hash_password(password: str, salt: Optional[str] = None) -> tuple[str, str]:
+        if salt is None:
+            salt = secrets.token_hex(32)
+        password_hash = hashlib.pbkdf2_hmac(
+            "sha256", password.encode("utf-8"), salt.encode("utf-8"), 100000
+        )
+        return password_hash.hex(), salt
+
+    def verify_password(self, password: str) -> bool:
+        password_hash, _ = self.hash_password(password, self.salt)
+        return password_hash == self.password_hash
+
+    def to_response(self) -> UserResponse:
+        return UserResponse(
+            id=self.id,
+            username=self.username,
+            email=self.email,
+            created_at=self.created_at,
+            profile_image_path=self.profile_image_path,
+            is_active=self.is_active,
+        )
diff --git a/Backend/services/__init__.py b/Backend/services/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/Backend/services/avatar_service.py b/Backend/services/avatar_service.py
new file mode 100644
index 0000000..0869583
--- /dev/null
+++ b/Backend/services/avatar_service.py
@@ -0,0 +1,74 @@
+from typing import Optional
+from ..schemas.avatar import (
+    AvatarUpdate,
+    Avatar,
+    AvatarOptions,
+    AvatarType,
+    TopClothesType,
+    BottomClothesType,
+)
+from ..utils.db import execute, fetch_one
+from ..utils.queries.avatar import AvatarQueries
+
+
+class AvatarService:
+
+    @staticmethod
+    async def init_db():
+        await execute(AvatarQueries.CREATE_TABLE)
+
+    async def get_or_create_avatar(self, user_id: int) -> Avatar:
+        avatar = await self.get_user_avatar(user_id)
+        if not avatar:
+            avatar = await self.create_default_avatar(user_id)
+        return avatar
+
+    async def get_user_avatar(self, user_id: int) -> Optional[Avatar]:
+        row = await fetch_one(AvatarQueries.SELECT_USER_AVATAR, (user_id,))
+        if not row:
+            return None
+        return Avatar(**row)
+
+    async def create_default_avatar(self, user_id: int) -> Avatar:
+        await execute(
+            AvatarQueries.INSERT_AVATAR,
+            (
+                user_id,
+                AvatarType.MALE.value,
+                TopClothesType.ANA_CLOTHES.value,
+                BottomClothesType.JEANS.value,
+            ),
+        )
+        return await self.get_user_avatar(user_id)
+
+    async def update_avatar(self, user_id: int, avatar_data: AvatarUpdate) -> Avatar:
+
+        update_fields = []
+        params = []
+
+        if avatar_data.avatar_type is not None:
+            update_fields.append("avatar_type = ?")
+            params.append(avatar_data.avatar_type.value)
+        if avatar_data.top_clothe_type is not None:
+            update_fields.append("top_clothe_type = ?")
+            params.append(avatar_data.top_clothe_type.value)
+        if avatar_data.bottom_clothe_type is not None:
+            update_fields.append("bottom_clothe_type = ?")
+            params.append(avatar_data.bottom_clothe_type.value)
+
+        if update_fields:
+            query = AvatarQueries.UPDATE_AVATAR.format(fields=", ".join(update_fields))
+            params.append(user_id)
+            await execute(query, tuple(params))
+
+        return await self.get_user_avatar(user_id)
+
+    async def get_avatar_options(self) -> AvatarOptions:
+        return AvatarOptions(
+            avatar_types=list(AvatarType),
+            top_clothe_types=list(TopClothesType),
+            bottom_clothe_types=list(BottomClothesType),
+        )
+    
+    async def get_avatar_by_userId(self, user_id: int) -> Optional[Avatar]:
+        return await self.get_user_avatar(user_id)
\ No newline at end of file
diff --git a/Backend/services/diary_service.py b/Backend/services/diary_service.py
new file mode 100644
index 0000000..e8fd232
--- /dev/null
+++ b/Backend/services/diary_service.py
@@ -0,0 +1,144 @@
+import os
+from datetime import datetime
+from typing import List, Optional
+from fastapi import UploadFile
+from ..schemas.diary import DiaryCreate, DiaryUpdate, Diary
+from ..utils.db import execute, fetch_one, fetch_all
+from ..utils.image_processor import ImageProcessor
+from ..utils.queries.diary import DiaryQueries
+
+
+class DiaryService:
+    def __init__(self):
+        self.image_processor = ImageProcessor()
+        self.upload_dir = "uploads/diary"
+        os.makedirs(self.upload_dir, exist_ok=True)
+
+    @staticmethod
+    async def init_db():
+        await execute(DiaryQueries.CREATE_TABLE)
+
+    async def create_diary(
+        self, user_id: int, diary_data: DiaryCreate, files: List[UploadFile]
+    ) -> Diary:
+        # image_path 는 ,로 구분 되어 있음
+        image_path = ""
+        if files is not None:
+            for file in files:
+                image_path += (
+                    ","
+                    + await self.image_processor.write_file_and_get_image_path(
+                        file, self.upload_dir
+                    )
+                )
+            image_path = image_path[1:]
+
+        query = DiaryQueries.INSERT_DIARY
+
+        created_at = datetime.now()
+        await execute(
+            query,
+            (
+                user_id,
+                diary_data.title,
+                diary_data.content,
+                image_path,
+                diary_data.category,
+                created_at,
+                False,
+                False,
+            ),
+        )
+
+        row = await fetch_one(
+            DiaryQueries.SELECT_LATEST_USER_DIARY,
+            (user_id,),
+        )
+
+        return Diary(**row)
+
+    async def get_user_diaries(
+        self, user_id: int, skip: int = 0, limit: int = 20, category: str = None
+    ) -> List[Diary]:
+        if category:
+            query = DiaryQueries.SELECT_USER_DIARIES_BY_CATEGORY
+            rows = await fetch_all(query, (user_id, category, limit, skip))
+        else:
+            query = DiaryQueries.SELECT_USER_DIARIES
+            rows = await fetch_all(query, (user_id, limit, skip))
+
+        return [Diary(**row) for row in rows]
+
+    async def get_diary_by_id(self, diary_id: int) -> Optional[Diary]:
+        query = DiaryQueries.SELECT_BY_ID
+        row = await fetch_one(query, (diary_id,))
+
+        if not row:
+            return None
+
+        return Diary(**row)
+
+    async def get_diary_with_user_id(
+        self, diary_id: int, user_id: int
+    ) -> Optional[Diary]:
+        query = DiaryQueries.SELECT_BY_ID_WITH_USER_ID
+        row = await fetch_one(query, (diary_id, user_id))
+
+        if not row:
+            return None
+
+        return Diary(**row)
+
+    async def update_diary(
+        self,
+        diary_id: int,
+        user_id: int,
+        diary_data: DiaryUpdate,
+        files: List[UploadFile],
+    ) -> Optional[Diary]:
+        diary = await self.get_diary_with_user_id(diary_id, user_id)
+        if not diary:
+            return None
+
+        update_fields = []
+        params = []
+
+        if diary_data.title is not None:
+            update_fields.append("title = ?")
+            params.append(diary_data.title)
+
+        if diary_data.content is not None:
+            update_fields.append("content = ?")
+            params.append(diary_data.content)
+
+        if diary_data.category is not None:
+            update_fields.append("category = ?")
+            params.append(diary_data.category)
+
+        if files is not None:
+            update_fields.append("images = ?")
+            image_paths = ""
+            for file in files:
+                image_paths += (
+                    ","
+                    + await self.image_processor.write_file_and_get_image_path(
+                        file, self.upload_dir
+                    )
+                )
+            image_paths = image_paths[1:]
+            params.append(image_paths)
+
+        if update_fields:
+            query = DiaryQueries.UPDATE_DIARY.format(fields=", ".join(update_fields))
+            params.extend([diary_id, user_id])
+            await execute(query, tuple(params))
+
+        return await self.get_diary_with_user_id(diary_id, user_id)
+
+    async def delete_diary(self, diary_id: int, user_id: int) -> bool:
+        try:
+            query = DiaryQueries.DELETE_DIARY
+            await execute(query, (diary_id, user_id))
+            return True
+        except Exception:
+            return False
diff --git a/Backend/services/friendship_service.py b/Backend/services/friendship_service.py
new file mode 100644
index 0000000..3ec4415
--- /dev/null
+++ b/Backend/services/friendship_service.py
@@ -0,0 +1,142 @@
+from typing import List, Optional
+from datetime import datetime
+from ..schemas.friendship import Friendship, FriendshipResponse, FriendshipStatus
+from ..utils.db import execute, fetch_one, fetch_all
+from ..utils.queries.friendship import FriendshipQueries
+
+
+class FriendshipService:
+
+    @staticmethod
+    async def init_db():
+        await execute(FriendshipQueries.CREATE_TABLE)
+
+    async def send_friendship_request(
+        self, user_id: int, friend_username: str
+    ) -> FriendshipResponse:
+        friend_query = FriendshipQueries.SELECT_USER_BY_USERNAME
+        friend_row = await fetch_one(friend_query, (friend_username,))
+
+        if not friend_row:
+            raise ValueError("User not found")
+
+        friend_id = friend_row["id"]
+
+        if user_id == friend_id:
+            raise ValueError("Cannot send friendship request to yourself")
+
+        existing_query = FriendshipQueries.SELECT_EXISTING_FRIENDSHIP
+        existing_row = await fetch_one(
+            existing_query, (user_id, friend_id, friend_id, user_id)
+        )
+
+        if existing_row:
+            raise ValueError("Friendship request already exists")
+
+        created_at = datetime.now()
+
+        query = FriendshipQueries.INSERT_FRIENDSHIP
+
+        await execute(
+            query, (user_id, friend_id, FriendshipStatus.PENDING.value, created_at)
+        )
+
+        friendship_row = await fetch_one(
+            FriendshipQueries.SELECT_FRIENDSHIP_BY_IDS,
+            (user_id, friend_id),
+        )
+
+        if not friendship_row:
+            raise ValueError("Friendship not found after creation")
+
+        friendship = Friendship(
+            id=friendship_row["id"],
+            user_id=friendship_row["user_id"],
+            friend_id=friendship_row["friend_id"],
+            status=friendship_row["status"],
+            created_at=friendship_row["created_at"],
+        )
+
+        return friendship.to_response(friend_username)
+
+    async def accept_friendship_request(
+        self, friendship_id: int, user_id: int
+    ) -> Optional[FriendshipResponse]:
+        friendship_query = FriendshipQueries.SELECT_FRIENDSHIP_FOR_ACCEPT
+
+        friendship_row = await fetch_one(
+            friendship_query,
+            (friendship_id, user_id, FriendshipStatus.PENDING.value),
+        )
+
+        if not friendship_row:
+            return None
+
+        update_query = FriendshipQueries.UPDATE_FRIENDSHIP_STATUS
+        await execute(update_query, (FriendshipStatus.ACCEPTED.value, friendship_id))
+
+        friendship = Friendship(
+            id=friendship_row["id"],
+            user_id=friendship_row["user_id"],
+            friend_id=friendship_row["friend_id"],
+            status=FriendshipStatus.ACCEPTED.value,
+            created_at=friendship_row["created_at"],
+        )
+
+        return friendship.to_response(friendship_row["username"])
+
+    async def get_user_friendships(
+        self, user_id: int, status: Optional[str] = None
+    ) -> List[FriendshipResponse]:
+        if status:
+            query = FriendshipQueries.SELECT_USER_FRIENDSHIPS_BY_STATUS
+            rows = await fetch_all(query, (user_id, user_id, user_id, status))
+        else:
+            query = FriendshipQueries.SELECT_USER_FRIENDSHIPS
+            rows = await fetch_all(
+                query, (user_id, user_id, user_id, FriendshipStatus.ACCEPTED.value)
+            )
+
+        friendships = []
+        for row in rows:
+            friendship = Friendship(
+                id=row["id"],
+                user_id=row["user_id"],
+                friend_id=row["friend_id"],
+                status=row["status"],
+                created_at=row["created_at"],
+            )
+            friendships.append(friendship.to_response(row["username"]))
+
+        return friendships
+
+    async def delete_friendship(self, friendship_id: int, user_id: int) -> bool:
+        query = FriendshipQueries.DELETE_FRIENDSHIP
+        await execute(query, (friendship_id, user_id, user_id))
+        return True
+
+    async def get_pending_requests(self, user_id: int) -> List[FriendshipResponse]:
+        query = FriendshipQueries.SELECT_PENDING_REQUESTS
+
+        rows = await fetch_all(query, (user_id, FriendshipStatus.PENDING.value))
+
+        friendships = []
+        for row in rows:
+            friendship = Friendship(
+                id=row["id"],
+                user_id=row["user_id"],
+                friend_id=row["friend_id"],
+                status=row["status"],
+                created_at=row["created_at"],
+            )
+            friendships.append(friendship.to_response(row["username"]))
+
+        return friendships
+
+    async def check_friendship(self, user_id1: int, user_id2: int) -> bool:
+        friendship_query = FriendshipQueries.CHECK_FRIENDSHIP_STATUS
+        friendship_row = await fetch_one(
+            friendship_query, (user_id1, user_id2, user_id2, user_id1)
+        )
+
+        return friendship_row is not None
diff --git a/Backend/services/guestbook_service.py b/Backend/services/guestbook_service.py
new file mode 100644
index 0000000..d1648a2
--- /dev/null
+++ b/Backend/services/guestbook_service.py
@@ -0,0 +1,110 @@
+from datetime import datetime
+from typing import List
+from fastapi import HTTPException
+from Backend.utils.db import execute, fetch_one, fetch_all
+from Backend.utils.queries.guestbook import GuestBookQueries
+from Backend.schemas.guestbook import GuestBook, GuestBookCreate, GuestbookResponse
+from Backend.schemas.user import User
+from Backend.utils.queries.user import UserQueries
+
+
+class GuestbookService:
+    def __init__(self):
+        pass
+
+    @staticmethod
+    async def init_db():
+        await execute(GuestBookQueries.CREATE_TABLE)
+
+    async def create_guestbook(
+        self, data: GuestBookCreate, user: User
+    ) -> GuestbookResponse:
+        user_exist = await fetch_one(UserQueries.SELECT_BY_ID, (data.target_user_id,))
+        if user_exist is None:
+            raise HTTPException(status_code=404, detail="User not found")
+
+        ex_row = await fetch_one(
+            GuestBookQueries.SELECT_GUEST_BOOK_BY_USER_ID, (user.id,)
+        )
+        created_at = datetime.now()
+        query = GuestBookQueries.INSERT_GUEST_BOOK
+        await execute(query, (data.target_user_id, user.id, data.content, created_at))
+
+        query = GuestBookQueries.SELECT_GUEST_BOOK_BY_USER_ID
+        row = await fetch_one(query, (user.id,))
+
+        if not (ex_row is None):
+            if row is None or ex_row["id"] == row["id"]:
+                raise HTTPException(
+                    status_code=400, detail="Failed to create guest book"
+                )
+
+        return GuestbookResponse(
+            id=row["id"],
+            content=row["content"],
+            target_user_id=row["target_user_id"],
+            user_id=row["user_id"],
+            user_profile_path=user.profile_image_path,
+            username=user.username,
+            created_at=row["created_at"],
+        )
+
+    async def get_target_user_guestbooks(
+        self, target_user_id: int, limit: int = 20, offset: int = 0
+    ) -> List[GuestbookResponse]:
+        query = GuestBookQueries.SELECT_TARGET_USER_GUEST_BOOKS
+
+        rows = await fetch_all(query, (target_user_id, limit, offset))
+
+        response_list = []
+        for row in rows:
+            user = await fetch_one(UserQueries.SELECT_BY_ID, (row["user_id"],))
+
+            response_list.append(
+                GuestbookResponse(
+                    id=row["id"],
+                    content=row["content"],
+                    target_user_id=row["target_user_id"],
+                    user_id=row["user_id"],
+                    user_profile_path=user["profile_image_path"],
+                    username=user["username"],
+                    created_at=row["created_at"],
+                )
+            )
+
+        return response_list
+
+    async def update_guestbook_by_id(self, id: int, content: str) -> GuestbookResponse:
+        query = GuestBookQueries.SELECT_GUEST_BOOK_BY_ID
+
+        row = await fetch_one(query, (id,))
+
+        if row is None:
+            raise HTTPException(status_code=404, detail="Guest book not found")
+
+        query = GuestBookQueries.UPDATE_GUEST_BOOK_BY_ID
+        await execute(query, (content, id))
+
+        query = GuestBookQueries.SELECT_GUEST_BOOK_BY_ID
+
+        row = await fetch_one(query, (id,))
+
+        user = await fetch_one(UserQueries.SELECT_BY_ID, (row["user_id"],))
+
+        return GuestbookResponse(
+            id=row["id"],
+            content=row["content"],
+            target_user_id=row["target_user_id"],
+            user_id=row["user_id"],
+            user_profile_path=user["profile_image_path"],
+            username=user["username"],
+            created_at=row["created_at"],
+        )
+
+    async def delete_guestbook_by_id(self, id: int, user_id: int) -> bool:
+        try:
+            query = GuestBookQueries.DELETE_GUEST_BOOK
+            await execute(query, (id, user_id))
+            return True
+        except Exception:
+            return False
diff --git a/Backend/services/letter_service.py b/Backend/services/letter_service.py
new file mode 100644
index 0000000..fcc6422
--- /dev/null
+++ b/Backend/services/letter_service.py
@@ -0,0 +1,81 @@
+# from typing import List, Optional
+# from ..schemas.letter import LetterCreate, Letter, EmailRequest
+# from ..utils.db import execute, fetch_one, fetch_all
+# from ..utils.default_queries import LetterQueries
+# from ..utils.email_processor import EmailProcessor
+#
+#
+# class LetterService:
+#     def __init__(self):
+#         self.email_processor = EmailProcessor()
+#
+#     @staticmethod
+#     async def init_db():
+#         await execute(LetterQueries.CREATE_TABLE)
+#
+#     async def create_letter(self, sender_id: int, letter_data: LetterCreate) -> Letter:
+#         query = LetterQueries.INSERT_LETTER
+#
+#         await execute(
+#             query,
+#             (sender_id, letter_data.content),
+#         )
+#
+#         row = await fetch_one(
+#             LetterQueries.SELECT_LATEST_USER_LETTER,
+#             (sender_id,),
+#         )
+#
+#         return Letter(**row)
+#
+#     async def get_user_letters(
+#         self, sender_id: int, skip: int = 0, limit: int = 20
+#     ) -> List[Letter]:
+#         query = LetterQueries.SELECT_USER_LETTERS
+#         rows = await fetch_all(query, (sender_id, limit, skip))
+#         return [Letter(**row) for row in rows]
+#
+#     async def get_letter_by_id(
+#         self, letter_id: int, sender_id: int
+#     ) -> Optional[Letter]:
+#         query = LetterQueries.SELECT_LETTER_BY_ID
+#         row = await fetch_one(query, (letter_id, sender_id))
+#         if not row:
+#             return None
+#         return Letter(**row)
+#
+#     async def delete_letter(self, letter_id: int, sender_id: int) -> bool:
+#         try:
+#             query = LetterQueries.DELETE_LETTER
+#             await execute(
+#                 query,
+#                 (letter_id, sender_id),
+#             )
+#             return True
+#         except Exception:
+#             return False
+#
+#     async def update_letter(
+#         self, letter_id: int, sender_id: int, content: str
+#     ) -> Optional[Letter]:
+#         query = LetterQueries.UPDATE_LETTER
+#         await execute(
+#             query,
+#             (content, letter_id, sender_id),
+#         )
+#
+#         row = await fetch_one(
+#             LetterQueries.SELECT_LETTER_BY_ID,
+#             (letter_id, sender_id),
+#         )
+#         if row is None:
+#             return None
+#
+#         return Letter(**row)
+#
+#     async def send_letter(self, letter: Letter, data: EmailRequest):
+#         subject = f"2025_SSF_LETTER_{data.sender_name}"
+#         content = letter.content
+#         await self.email_processor.send_email(
+#             subject, content, data.sender_email, data.sender_password
+#         )
diff --git a/Backend/services/photo_service.py b/Backend/services/photo_service.py
new file mode 100644
index 0000000..43f11f8
--- /dev/null
+++ b/Backend/services/photo_service.py
@@ -0,0 +1,150 @@
+# import os
+# from datetime import datetime
+# from typing import List
+# from fastapi import UploadFile
+# from ..schemas.photo import (
+#     PhotoUpload,
+#     Photo,
+#     PhotoComment,
+#     CommentCreate,
+#     CommentResponse,
+# )
+# from ..utils.db import execute, fetch_one, fetch_all
+# from ..utils.default_queries import PhotoQueries
+# from ..utils.image_processor import ImageProcessor
+#
+#
+# class PhotoService:
+#     def __init__(self):
+#         self.image_processor = ImageProcessor()
+#         self.upload_dir = "uploads/photos"
+#         os.makedirs(self.upload_dir, exist_ok=True)
+#
+#     @staticmethod
+#     async def init_db():
+#         await execute(PhotoQueries.CREATE_TABLE)
+#         await execute(PhotoQueries.CREATE_COMMENTS_TABLE)
+#
+#     async def upload_photo(
+#         self, user_id: int, photo_data: PhotoUpload, file: UploadFile
+#     ) -> Photo:
+#         if not file.content_type.startswith("image/"):
+#             raise ValueError("File must be an image")
+#
+#         self.image_processor.validate_image_file(file.filename, file.size)
+#
+#         created_at = datetime.now()
+#
+#         image_path = await self.image_processor.write_file_and_get_image_path(
+#             file, self.upload_dir
+#         )
+#
+#         query = PhotoQueries.INSERT_PHOTO
+#
+#         await execute(
+#             query,
+#             (user_id, photo_data.album_name, image_path, photo_data.title, created_at),
+#         )
+#
+#         row = await fetch_one(
+#             PhotoQueries.SELECT_LATEST_USER_PHOTO,
+#             (user_id,),
+#         )
+#
+#         return Photo(**row)
+#
+#     async def get_user_photos(
+#         self, user_id: int, skip: int = 0, limit: int = 20, album_name: str = None
+#     ) -> List[Photo]:
+#         if album_name:
+#             query = PhotoQueries.SELECT_USER_PHOTOS_BY_ALBUM
+#             rows = await fetch_all(query, (user_id, album_name, limit, skip))
+#         else:
+#             query = PhotoQueries.SELECT_USER_PHOTOS
+#             rows = await fetch_all(query, (user_id, limit, skip))
+#
+#         return [Photo(**row) for row in rows]
+#
+#     async def check_friendship(self, user_id: int, photo_id: int) -> bool:
+#         photo_query = PhotoQueries.SELECT_PHOTO_OWNER
+#         photo_row = await fetch_one(photo_query, (photo_id,))
+#
+#         if not photo_row:
+#             return False
+#
+#         photo_owner_id = photo_row["user_id"]
+#
+#         if user_id == photo_owner_id:
+#             return True
+#
+#         from ..services.friendship_service import FriendshipService
+#
+#         friendship_service = FriendshipService()
+#         return await friendship_service.check_friendship(user_id, photo_owner_id)
+#
+#     async def add_comment(
+#         self, photo_id: int, user_id: int, comment_data: CommentCreate
+#     ) -> PhotoComment:
+#         if not await self.check_friendship(user_id, photo_id):
+#             raise ValueError("Cannot add comment before being friends")
+#         created_at = datetime.now()
+#
+#         query = PhotoQueries.INSERT_COMMENT
+#
+#         await execute(query, (photo_id, user_id, comment_data.content, created_at))
+#
+#         row = await fetch_one(
+#             PhotoQueries.SELECT_LATEST_COMMENT,
+#             (photo_id, user_id),
+#         )
+#
+#         return PhotoComment(**row)
+#
+#     async def get_photo_comments(self, photo_id: int) -> List[CommentResponse]:
+#         query = PhotoQueries.SELECT_PHOTO_COMMENTS
+#
+#         rows = await fetch_all(query, (photo_id,))
+#
+#         return [CommentResponse(**row) for row in rows]
+#
+#     async def apply_filter(
+#         self,
+#         photo_id: int,
+#         filter_type: str,
+#         user_id: int,
+#         cover: bool = False,
+#         title: str = None,
+#     ) -> str:
+#         photo_query = PhotoQueries.SELECT_PHOTO_BY_ID
+#         row = await fetch_one(photo_query, (photo_id, user_id))
+#
+#         if not row:
+#             raise ValueError("Photo not found")
+#
+#         original_path = row["image_path"]
+#         filtered_path = await self.image_processor.apply_filter(
+#             original_path, filter_type
+#         )
+#
+#         if cover:
+#             photo_update_query = PhotoQueries.UPDATE_PHOTO_PATH
+#             await execute(photo_update_query, (filtered_path, photo_id, user_id))
+#         else:
+#             row = await fetch_one(
+#                 PhotoQueries.SELECT_PHOTO_ALBUM_NAME, (photo_id, user_id)
+#             )
+#             photo_create_query = PhotoQueries.INSERT_PHOTO
+#             await execute(
+#                 photo_create_query,
+#                 (user_id, row["album_name"], filtered_path, title, datetime.now()),
+#             )
+#
+#         return filtered_path
+#
+#     async def delete_photo(self, photo_id: int, user_id: int) -> bool:
+#         try:
+#             query = PhotoQueries.DELETE_PHOTO
+#             await execute(query, (photo_id, user_id))
+#             return True
+#         except Exception:
+#             return False
diff --git a/Backend/services/room_service.py b/Backend/services/room_service.py
new file mode 100644
index 0000000..122e4ba
--- /dev/null
+++ b/Backend/services/room_service.py
@@ -0,0 +1,149 @@
+from fastapi import HTTPException
+from typing import List
+from Backend.utils.queries.room import RoomQueries
+from Backend.schemas.room import (
+    FurnitureItem,
+    RoomFurniturePlacement,
+    FurniturePlacementRequest,
+    Room,
+    RoomTypes,
+    RoomTypeResponse,
+    room_path,
+    Furniture,
+    furniture_path,
+    RoomFurnitureResponse,
+    FurniturePlacementResponse,
+    RoomResponse,
+)
+from Backend.utils.db import fetch_all, fetch_one, execute
+
+
+class RoomService:
+
+    @staticmethod
+    async def init_db():
+        await execute(RoomQueries.CREATE_TABLE)
+        await execute(RoomQueries.CREATE_TABLE_ROOM_FURNITURE)
+        await execute(RoomQueries.CREATE_TABLE_USER_FURNITURE)
+
+    async def get_or_create_room(self, user_id: int) -> int:
+        row = await fetch_one(RoomQueries.SELECT_ROOM_ID_BY_USER_ID, (user_id,))
+        if row:
+            return row["id"]
+
+        await execute(RoomQueries.INSERT_ROOM, (user_id, "My Room", "room_1"))
+        new_row = await fetch_one(RoomQueries.SELECT_ROOM_ID_BY_USER_ID, (user_id,))
+
+        return new_row["id"]
+
+    async def get_room_by_id(self, id: int) -> Room:
+        row = await fetch_one(RoomQueries.SELECT_ROOM_BY_ID, (id,))
+        if row is None:
+            raise HTTPException(status_code=404, detail="Room not found")
+
+        return Room(**row)
+    
+    async def get_room_by_userId(self, id: int) -> Room:
+        row = await fetch_one(RoomQueries.SELECT_ROOM_BY_USER_ID, (id,))
+        if row is None:
+            raise HTTPException(status_code=404, detail="Room not found")
+
+        return Room(**row)
+
+    async def get_room_types(self) -> List[RoomTypeResponse]:
+        return [
+            RoomTypeResponse(type=rt.value, image_path=room_path[rt.value])
+            for rt in RoomTypes
+        ]
+
+    async def update_room_name(self, room_id: int, new_name: str):
+        await execute(RoomQueries.UPDATE_ROOM_NAME, (new_name, room_id))
+
+    async def update_room_type(self, room_id: int, new_type: RoomTypes):
+        query = RoomQueries.UPDATE_ROOM_TYPE
+        await execute(query, (new_type.value, room_id))
+
+        row = await fetch_one(RoomQueries.SELECT_ROOM_BY_ID, (room_id,))
+        return Room(**row)
+
+    # furniture
+    async def get_furniture_catalog(self) -> List[FurnitureItem]:
+        furniture_list = []
+        for f in list(Furniture):
+            furniture_list.append(
+                FurnitureItem(
+                    name=f,
+                    image_path=furniture_path[f],
+                    width=int(f[-1]),
+                )
+            )
+
+        return furniture_list
+
+    async def get_room_furnitures(self, room_id: int) -> RoomFurnitureResponse:
+        rows = await fetch_all(RoomQueries.SELECT_ROOM_FURNITURE, (room_id,))
+        furniture_placement_response = []
+        for row in rows:
+            furniture_placement_response.append(
+                FurniturePlacementResponse(
+                    furniture_name=row["furniture_name"],
+                    x=row["x"],
+                    y=row["y"],
+                    image_path=furniture_path[row["furniture_name"]],
+                )
+            )
+        row = await fetch_one(RoomQueries.SELECT_ROOM_BY_ID, (room_id,))
+        return RoomFurnitureResponse(
+            furniture=furniture_placement_response,
+            room=RoomResponse(
+                id=row["id"],
+                user_id=row["user_id"],
+                room_name=row["room_name"],
+                room_type=row["room_type"],
+                room_image_path=room_path[row["room_type"]],
+            ),
+        )
+
+    async def place_furniture(self, room_id: int, request: FurniturePlacementRequest):
+        is_oneone = furniture_path.get(request.furniture_name + "1") is not None
+
+        placed_furnitures = await fetch_all(
+            RoomQueries.SELECT_ROOM_FURNITURE, (room_id,)
+        )
+
+        for f in placed_furnitures:
+            if f["x"] == request.x and f["y"] == request.y:
+                raise HTTPException(status_code=409, detail="Furniture already placed")
+
+        await execute(
+            RoomQueries.INSERT_ROOM_FURNITURE,
+            (room_id, request.furniture_name, request.x, request.y),
+        )
+        if not is_oneone:
+            await execute(
+                RoomQueries.INSERT_ROOM_FURNITURE,
+                (room_id, "1", request.x - 1, request.y),
+            )
+
+    async def remove_furniture(self, room_id: int, x: int, y: int, furniture_name: str):
+        is_oneone = furniture_path.get(furniture_name + "1") is not None
+        await execute(RoomQueries.DELETE_FURNITURE, (room_id, x, y))
+        if not is_oneone:
+            await execute(RoomQueries.DELETE_FURNITURE, (room_id, x - 1, y))
+
+    async def add_furniture(self, user_id: int, furniture_name: str):
+        await execute(RoomQueries.INSERT_USER_FURNITURE, (user_id, furniture_name))
+
+    async def get_user_furniture(self, user_id: int):
+        rows = await fetch_all(RoomQueries.SELECT_USER_FURNITURE, (user_id,))
+        furniture_list = []
+        for row in rows:
+            furniture_list.append(
+                FurnitureItem(
+                    name=row["furniture_name"],
+                    image_path=furniture_path[row["furniture_name"]],
+                    width=int(row["furniture_name"][-1]),
+                )
+            )
+
+        return furniture_list
\ No newline at end of file
diff --git a/Backend/services/store_service.py b/Backend/services/store_service.py
new file mode 100644
index 0000000..d393875
--- /dev/null
+++ b/Backend/services/store_service.py
@@ -0,0 +1,33 @@
+import httpx
+
+
+class StoreService:
+    def __init__(self):
+        self.SERVER_URL = "https://dotory.ana.st"
+
+    async def get_dotory_by_id(self, user_id: int):
+        async with httpx.AsyncClient() as client:
+            response = await client.get(f"{self.SERVER_URL}/")
+            response_json = response.json()
+            return 
+
+    async def register_user(self, user_id: int):
+        async with httpx.AsyncClient() as client:
+            response = await client.post(
+                f"{self.SERVER_URL}/", json={"user_id": user_id}
+            )
+            return 
+
+    async def buy_product(self, product_id: int, user_id: int):
+        async with httpx.AsyncClient() as client:
+            response = await client.post(
+                f"{self.SERVER_URL}/", json={"user_id": user_id}
+            )
+            return 
+
+    async def update_user_dotory(self, user_id: int, dotoryNum: int):
+        async with httpx.AsyncClient() as client:
+            response = await client.put(
+                f"{self.SERVER_URL}/", json={"num": dotoryNum}
+            )
+            return 
\ No newline at end of file
diff --git a/Backend/services/user_service.py b/Backend/services/user_service.py
new file mode 100644
index 0000000..d85800e
--- /dev/null
+++ b/Backend/services/user_service.py
@@ -0,0 +1,176 @@
+from datetime import datetime, timezone, timedelta
+from typing import Optional, List
+import os
+from fastapi import UploadFile
+from Backend.utils.db import execute, fetch_one, fetch_all
+from Backend.utils.image_processor import ImageProcessor
+from Backend.utils.queries.user import UserQueries
+from Backend.schemas.user import User, UserCreate, UserResponse, UserUpdate
+from Backend.services.store_service import StoreService
+
+store_service = StoreService()
+
+class UserService:
+    def __init__(self):
+        self.image_processor = ImageProcessor()
+        self.upload_dir = "uploads/profile"
+        os.makedirs(self.upload_dir, exist_ok=True)
+
+    @staticmethod
+    async def init_db():
+        await execute(UserQueries.CREATE_TABLE)
+
+    async def create_user(
+        self, user_data: UserCreate, profile_file: UploadFile = None
+    ) -> User:
+        password_hash, salt = 
+
+        if profile_file is not None:
+            await self.image_processor.validate_image_file(
+                
+            )
+            image_path = 
+            query = UserQueries.INSERT_USER_WITH_PROFILE
+            params = (
+                user_data.username,
+                user_data.email,
+                password_hash,
+                salt,
+                image_path,
+            )
+        else:
+            query = UserQueries.INSERT_USER_WITHOUT_PROFILE
+            params = (user_data.username, user_data.email, password_hash, salt)
+
+        await execute(
+            query,
+            params,
+        )
+
+        row = await fetch_one(
+            UserQueries.SELECT_BY_USERNAME,
+            (user_data.username,),
+        )
+
+        if row is None:
+            raise Exception("User creation failed")
+
+        row = dict(row)
+
+        if isinstance(row["created_at"], str):
+            datetime.fromisoformat(row["created_at"].replace("Z", "+09:00"))
+
+        row["is_active"] = bool(row["is_active"])
+
+        await store_service.register_user(row["id"])
+
+
+        return User(**row)
+
+    async def get_user_by_username(self, username: str) -> Optional[User]:
+        row = await fetch_one(
+            UserQueries.SELECT_BY_USERNAME,
+            (username,),
+        )
+
+        if row is None:
+            return None
+
+        row = dict(row)
+
+        if isinstance(row["created_at"], str):
+            datetime.fromisoformat(row["created_at"].replace("Z", "+09:00"))
+
+        row["is_active"] = bool(row["is_active"])
+
+        return User(**row)
+
+    async def get_user_by_email(self, email: str) -> Optional[User]:
+        row = await fetch_one(
+            UserQueries.SELECT_BY_EMAIL,
+            (email,),
+        )
+
+        if row is None:
+            return None
+
+        row = dict(row)
+
+        if isinstance(row["created_at"], str):
+            datetime.fromisoformat(row["created_at"].replace("Z", "+09:00"))
+
+        row["is_active"] = bool(row["is_active"])
+
+        return User(**row)
+
+    async def authenticate_user(self, username: str, password: str) -> Optional[User]:
+        user = 
+        if user and :
+            return user
+        return None
+
+    async def delete_user(self, username: str) -> bool:
+        try:
+            query = UserQueries.DELETE_USER_BY_USERNAME
+            await execute(query, (username,))
+            return True
+        except Exception:
+            return False
+
+    async def find_user(self, username: str) -> List[UserResponse]:
+        query = UserQueries.SELECT_BY_USERNAME_LIKE
+        rows = await fetch_all(
+            query,
+            ("%" + username + "%",),
+        )
+
+        return [User(**row).to_response() for row in rows]
+
+    async def get_user_by_id(self, user_id: int) -> Optional[User]:
+        row = await fetch_one(UserQueries.SELECT_BY_ID, (user_id,))
+        if row is None:
+            return None
+        row = dict(row)
+        if isinstance(row["created_at"], str):
+            datetime.fromisoformat(row["created_at"].replace("Z", "+09:00"))
+        row["is_active"] = bool(row["is_active"])
+        return User(**row)
+
+    async def update_user(
+        self, user: User, user_data: UserUpdate, profile_file: UploadFile = None
+    ) -> User:
+        update_fields = {}
+        if user_data.email:
+            existing_user = await fetch_one(
+                UserQueries.SELECT_USER_BY_EMAIL_AND_NOT_ID,
+                (user_data.email, user.id),
+            )
+            if existing_user:
+                raise ValueError("Email already registered")
+            update_fields["email"] = user_data.email
+
+        if user_data.password:
+            password_hash, salt = User.hash_password(user_data.password)
+            update_fields["password_hash"] = password_hash
+            update_fields["salt"] = salt
+
+        if profile_file:
+            await self.image_processor.validate_image_file(
+                profile_file.filename, profile_file.size
+            )
+            image_path = await self.image_processor.write_file_and_get_image_path(
+                profile_file, upload_dir=self.upload_dir
+            )
+            update_fields["profile_image_path"] = image_path
+
+        if not update_fields:
+            return user
+
+        set_clause = ", ".join(f"{key} = ?" for key in update_fields.keys())
+        query = UserQueries.UPDATE_USER_BY_ID.format(set_clause)
+        params = list(update_fields.values())
+        params.append(user.id)
+
+        await execute(query, tuple(params))
+
+        return await self.get_user_by_id(user.id)
diff --git a/Backend/tests/__init__.py b/Backend/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/Backend/tests/conftest.py b/Backend/tests/conftest.py
new file mode 100644
index 0000000..312f139
--- /dev/null
+++ b/Backend/tests/conftest.py
@@ -0,0 +1,81 @@
+import pytest
+from fastapi.testclient import TestClient
+import sys
+import os
+
+# Add Backend to path
+sys.path.append(os.path.join(os.path.dirname(__file__), ".."))
+
+from Backend import app
+
+
+@pytest.fixture(scope="module")
+def client():
+    with TestClient(app) as c:
+        yield c
+
+
+@pytest.fixture
+def authenticated_user(client):
+    user_data = {
+        "username": "testuser_authenticated",
+        "email": "test_auth@example.com",
+        "password": "testpassword123",
+    }
+    # Register user
+    response = client.post("/api/user/register", data=user_data)
+
+    # Login to get token
+    login_data = {"username": user_data["username"], "password": user_data["password"]}
+    response = client.post("/api/user/login", json=login_data)
+    token = response.json()["access_token"]
+
+    yield {"token": token, "user_data": user_data}
+
+    # Cleanup: delete user via API
+    headers = {"Authorization": f"Bearer {token}"}
+    client.delete(f"/api/user/{user_data['username']}", headers=headers)
+
+
+@pytest.fixture
+def two_authenticated_users(client):
+    user1_data = {
+        "username": "testuser1",
+        "email": "test1@example.com",
+        "password": "testpassword123",
+    }
+    user2_data = {
+        "username": "testuser2",
+        "email": "test2@example.com",
+        "password": "testpassword123",
+    }
+
+    # Register users
+    client.post("/api/user/register", data=user1_data)
+    client.post("/api/user/register", data=user2_data)
+
+    # Login users
+    login1_data = {
+        "username": user1_data["username"],
+        "password": user1_data["password"],
+    }
+    response1 = client.post("/api/user/login", json=login1_data)
+    token1 = response1.json()["access_token"]
+
+    login2_data = {
+        "username": user2_data["username"],
+        "password": user2_data["password"],
+    }
+    response2 = client.post("/api/user/login", json=login2_data)
+    token2 = response2.json()["access_token"]
+
+    yield {
+        "user1": {"token": token1, "username": user1_data["username"]},
+        "user2": {"token": token2, "username": user2_data["username"]},
+    }
+
+    # Cleanup
+    headers1 = {"Authorization": f"Bearer {token1}"}
+    headers2 = {"Authorization": f"Bearer {token2}"}
+    client.delete(f"/api/user/{user1_data['username']}", headers=headers1)
+    client.delete(f"/api/user/{user2_data['username']}", headers=headers2)
diff --git a/Backend/tests/test_avatar.py b/Backend/tests/test_avatar.py
new file mode 100644
index 0000000..13d41d8
--- /dev/null
+++ b/Backend/tests/test_avatar.py
@@ -0,0 +1,71 @@
+from fastapi.testclient import TestClient
+from Backend.schemas.avatar import (
+    AvatarUpdate,
+    AvatarType,
+    TopClothesType,
+    BottomClothesType,
+)
+
+
+def test_get_my_avatar(client: TestClient, authenticated_user):
+    headers = {"Authorization": f"Bearer {authenticated_user['token']}"}
+    response = client.get("/api/avatar", headers=headers)
+    assert response.status_code == 200
+    avatar_data = response.json()
+    assert "id" in avatar_data
+    assert "user_id" in avatar_data
+    assert avatar_data["avatar_type"]["name"] == AvatarType.MALE.value
+
+
+def test_update_my_avatar(client: TestClient, authenticated_user):
+    headers = {"Authorization": f"Bearer {authenticated_user['token']}"}
+
+    response = client.get("/api/avatar", headers=headers)
+    assert response.status_code == 200
+    update_data = AvatarUpdate(
+        avatar_type=AvatarType.FEMALE,
+        top_clothe_type=TopClothesType.SCHOOL_CLOTHES,
+        bottom_clothe_type=BottomClothesType.SCHOOL_CLOTHES_2,
+    )
+    response = client.put(
+        "/api/avatar", json=update_data.model_dump(mode="json"), headers=headers
+    )
+
+    assert response.status_code == 200
+    avatar_data = response.json()
+    assert avatar_data["avatar_type"]["name"] == update_data.avatar_type.value
+    assert avatar_data["top_clothe_type"]["name"] == update_data.top_clothe_type.value
+    assert (
+        avatar_data["bottom_clothe_type"]["name"]
+        == update_data.bottom_clothe_type.value
+    )
+
+
+def test_get_avatar_options(client: TestClient):
+    response = client.get("/api/avatar/options")
+    assert response.status_code == 200
+    options = response.json()
+    assert "avatar_types" in options
+    assert "top_clothe_types" in options
+    assert "bottom_clothe_types" in options
+    assert all(isinstance(item, str) for item in options["avatar_types"])
+    assert all(isinstance(item, str) for item in options["top_clothe_types"])
+    assert all(isinstance(item, str) for item in options["bottom_clothe_types"])
+
+
+def test_get_avatar_by_user_id(client: TestClient, authenticated_user):
+    headers = {"Authorization": f"Bearer {authenticated_user['token']}"}
+    response = client.get("/api/avatar", headers=headers)
+    assert response.status_code == 200
+    user_id = response.json()["user_id"]
+
+    response = client.get(f"/api/avatar/{user_id}", headers=headers)
+    assert response.status_code == 200
+    avatar_data = response.json()
+    assert "id" in avatar_data
+    assert avatar_data["user_id"] == user_id
+    assert avatar_data["avatar_type"]["name"] == AvatarType.MALE.value
+
+    # Test for a non-existent user
+    response = client.get("/api/avatar/9999", headers=headers)
+    assert response.status_code == 404
\ No newline at end of file
diff --git a/Backend/tests/test_diary.py b/Backend/tests/test_diary.py
new file mode 100644
index 0000000..f5bd904
--- /dev/null
+++ b/Backend/tests/test_diary.py
@@ -0,0 +1,52 @@
+from io import BytesIO
+
+
+def test_diary_operations(client, authenticated_user):
+    token = authenticated_user["token"]
+    headers = {"Authorization": f"Bearer {token}"}
+
+    # Create Diary
+    diary_data = {
+        "title": "test title",
+        "content": "test content",
+        "category": "test category",
+    }
+    response = client.post(
+        "/api/diary",
+        data=diary_data,
+        files={"file": ("a.jpg", BytesIO(b"aaa"), "image/jpeg")},
+        headers=headers,
+    )
+    assert response.status_code == 200
+    diary_id = response.json()["id"]
+    assert response.json()["title"] == "test title"
+
+    # Get Diary
+    response = client.get(f"/api/diary/{diary_id}", headers=headers)
+    assert response.status_code == 200
+    assert response.json()["id"] == diary_id
+
+    # List Diaries
+    response = client.get("/api/diary", headers=headers)
+    assert response.status_code == 200
+    assert len(response.json()) > 0
+
+    # Update Diary
+    updated_diary_data = {"title": "updated title", "content": "updated content"}
+    response = client.put(
+        f"/api/diary/{diary_id}",
+        data=updated_diary_data,
+        files={"file": ("b.jpg", BytesIO(b"bbb"), "image/jpeg")},
+        headers=headers,
+    )
+    assert response.status_code == 200
+    assert response.json()["title"] == "updated title"
+
+    # Delete Diary
+    response = client.delete(f"/api/diary/{diary_id}", headers=headers)
+    assert response.status_code == 200
+    assert response.json()["message"] == "Diary deleted successfully"
+
+    # Verify Deletion
+    response = client.get(f"/api/diary/{diary_id}", headers=headers)
+    assert response.status_code == 400
diff --git a/Backend/tests/test_friendship.py b/Backend/tests/test_friendship.py
new file mode 100644
index 0000000..781fc4a
--- /dev/null
+++ b/Backend/tests/test_friendship.py
@@ -0,0 +1,45 @@
+def test_friendship_flow(client, two_authenticated_users):
+    user1 = two_authenticated_users["user1"]
+    user2 = two_authenticated_users["user2"]
+
+    headers1 = {"Authorization": f"Bearer {user1['token']}"}
+    headers2 = {"Authorization": f"Bearer {user2['token']}"}
+
+    # User 1 sends friendship request to User 2
+    response = client.post(
+        "/api/friendship/request",
+        json={"friend_username": user2["username"]},
+        headers=headers1,
+    )
+    assert response.status_code == 200
+    friendship_id = response.json()["id"]
+    assert response.json()["status"] == "pending"
+
+    # User 2 accepts friendship request
+    response = client.put(f"/api/friendship/{friendship_id}/accept", headers=headers2)
+    assert response.status_code == 200
+    assert response.json()["status"] == "accepted"
+
+    # User 1 lists friends
+    response = client.get("/api/friendship", headers=headers1)
+    assert response.status_code == 200
+    assert any(f["id"] == friendship_id for f in response.json())
+
+    # User 2 lists friends
+    response = client.get("/api/friendship", headers=headers2)
+    assert response.status_code == 200
+    assert any(f["id"] == friendship_id for f in response.json())
+
+    # User 1 deletes friendship
+    response = client.delete(f"/api/friendship/{friendship_id}", headers=headers1)
+    assert response.status_code == 200
+    assert response.json()["message"] == "Friendship deleted successfully"
+
+    # Verify deletion for both users
+    response = client.get("/api/friendship", headers=headers1)
+    assert response.status_code == 200
+    assert not any(f["id"] == friendship_id for f in response.json())
+
+    response = client.get("/api/friendship", headers=headers2)
+    assert response.status_code == 200
+    assert not any(f["id"] == friendship_id for f in response.json())
diff --git a/Backend/tests/test_guestbook.py b/Backend/tests/test_guestbook.py
new file mode 100644
index 0000000..c256f97
--- /dev/null
+++ b/Backend/tests/test_guestbook.py
@@ -0,0 +1,38 @@
+def test_guest_book(client, authenticated_user):
+    token = authenticated_user["token"]
+    headers = {"Authorization": f"Bearer {token}"}
+
+    user_data = {
+        "username": "testtarget",
+        "email": "test@example.com",
+        "password": "testpassword123",
+    }
+    response = client.post("/api/user/register", data=user_data)
+    assert response.status_code == 201
+    user_id = response.json()["id"]
+    username = response.json()["username"]
+
+    response = client.post(
+        "/api/guestbook",
+        json={"target_user_id": user_id, "content": "test"},
+        headers=headers,
+    )
+    assert response.status_code == 201
+    assert response.json()["content"] == "test"
+    id = response.json()["id"]
+
+    response = client.get(f"/api/guestbook/{user_id}", headers=headers)
+    assert response.status_code == 200
+    assert response.json()[0]["content"] == "test"
+
+    response = client.put(
+        f"/api/guestbook/{id}", json={"content": "test2"}, headers=headers
+    )
+    assert response.status_code == 200
+    assert response.json()["content"] == "test2"
+
+    response = client.delete(f"/api/guestbook/{id}", headers=headers)
+    assert response.status_code == 200
+
+    client.delete(f"/api/user/{username}", headers=headers)
+    assert response.status_code == 200
diff --git a/Backend/tests/test_letter.py b/Backend/tests/test_letter.py
new file mode 100644
index 0000000..014db38
--- /dev/null
+++ b/Backend/tests/test_letter.py
@@ -0,0 +1,32 @@
+# def test_letter_operations(client, authenticated_user):
+#     token = authenticated_user["token"]
+#     headers = {"Authorization": f"Bearer {token}"}
+#
+#     # Create Letter
+#     letter_data = {"content": "test content"}
+#     response = client.post("/api/letter", json=letter_data, headers=headers)
+#     assert response.status_code == 200
+#     letter_id = response.json()["id"]
+#     assert response.json()["content"] == "test content"
+#
+#     # Get Letter
+#     response = client.get(f"/api/letter/{letter_id}", headers=headers)
+#     assert response.status_code == 200
+#     assert response.json()["id"] == letter_id
+#
+#     # Update Letter
+#     updated_letter_data = {"content": "updated content"}
+#     response = client.put(
+#         f"/api/letter/{letter_id}", json=updated_letter_data, headers=headers
+#     )
+#     assert response.status_code == 200
+#     assert response.json()["content"] == "updated content"
+#
+#     # Delete Letter
+#     response = client.delete(f"/api/letter/{letter_id}", headers=headers)
+#     assert response.status_code == 200
+#     assert response.json()["detail"] == "Letter deleted"
+#
+#     # Verify Deletion
+#     response = client.get(f"/api/letter/{letter_id}", headers=headers)
+#     assert response.status_code == 400
diff --git a/Backend/tests/test_photo.py b/Backend/tests/test_photo.py
new file mode 100644
index 0000000..932b771
--- /dev/null
+++ b/Backend/tests/test_photo.py
@@ -0,0 +1,94 @@
+# from io import BytesIO
+# import json
+#
+#
+# def test_photo_upload_and_delete(client, authenticated_user):
+#     token = authenticated_user["token"]
+#     headers = {"Authorization": f"Bearer {token}"}
+#
+#     # Upload Photo
+#     photo_data = {"album_name": "test_album", "title": "test_title"}
+#     photo_data_json = json.dumps(photo_data).encode("utf-8")
+#
+#     response = client.post(
+#         "/api/photo/upload",
+#         files={
+#             "photo_data": (
+#                 "photo_data.json",
+#                 BytesIO(photo_data_json),
+#                 "application/json",
+#             ),
+#             "file": ("a.jpg", BytesIO(b"aaa"), "image/jpeg"),
+#         },
+#         headers=headers,
+#     )
+#     assert response.status_code == 200
+#     photo_id = response.json()["id"]
+#     assert response.json()["album_name"] == "test_album"
+#
+#     # Delete Photo
+#     response = client.delete(f"/api/photo/{photo_id}", headers=headers)
+#     assert response.status_code == 200
+#     assert response.json()["message"] == "Photo deleted successfully"
+#
+#
+# def test_photo_commenting(client, two_authenticated_users):
+#     user1 = two_authenticated_users["user1"]
+#     user2 = two_authenticated_users["user2"]
+#
+#     headers1 = {"Authorization": f"Bearer {user1['token']}"}
+#     headers2 = {"Authorization": f"Bearer {user2['token']}"}
+#
+#     # User 1 uploads a photo
+#     photo_data = {"album_name": "test_album", "title": "test_title"}
+#     photo_data_json = json.dumps(photo_data).encode("utf-8")
+#     response = client.post(
+#         "/api/photo/upload",
+#         files={
+#             "photo_data": (
+#                 "photo_data.json",
+#                 BytesIO(photo_data_json),
+#                 "application/json",
+#             ),
+#             "file": ("a.jpg", BytesIO(b"aaa"), "image/jpeg"),
+#         },
+#         headers=headers1,
+#     )
+#     assert response.status_code == 200
+#     photo_id = response.json()["id"]
+#
+#     # User 2 cannot comment before being friends
+#     response = client.post(
+#         f"/api/photo/{photo_id}/comment",
+#         json={"content": "test comment"},
+#         headers=headers2,
+#     )
+#     assert response.status_code == 400
+#
+#     # User 1 sends friendship request to User 2
+#     response = client.post(
+#         "/api/friendship/request",
+#         json={"friend_username": user2["username"]},
+#         headers=headers1,
+#     )
+#     assert response.status_code == 200
+#     friendship_id = response.json()["id"]
+#
+#     # User 2 accepts friendship request
+#     response = client.put(f"/api/friendship/{friendship_id}/accept", headers=headers2)
+#     assert response.status_code == 200
+#
+#     # User 2 can now comment
+#     response = client.post(
+#         f"/api/photo/{photo_id}/comment",
+#         json={"content": "test comment"},
+#         headers=headers2,
+#     )
+#     assert response.status_code == 200
+#     assert response.json()["content"] == "test comment"
+#
+#     # User 1 can see the comment
+#     response = client.get(f"/api/photo/{photo_id}/comments", headers=headers1)
+#     assert response.status_code == 200
+#     assert len(response.json()) > 0
+#     assert response.json()[0]["content"] == "test comment"
diff --git a/Backend/tests/test_room.py b/Backend/tests/test_room.py
new file mode 100644
index 0000000..509fafd
--- /dev/null
+++ b/Backend/tests/test_room.py
@@ -0,0 +1,161 @@
+from fastapi.testclient import TestClient
+from Backend.schemas.room import Furniture, RoomTypes
+
+
+def test_get_furniture_catalog(client: TestClient):
+    response = client.get("/api/room/catalog")
+    assert response.status_code == 200
+    catalog = response.json()
+    assert isinstance(catalog, list)
+    assert len(catalog) > 0
+    for item in catalog:
+        assert "name" in item
+        assert "image_path" in item
+        assert "width" in item
+
+
+def test_get_room_types(client: TestClient):
+    response = client.get("/api/room/types")
+    assert response.status_code == 200
+    types = response.json()
+    assert isinstance(types, list)
+    assert len(types) > 0
+    for room_type in types:
+        assert "type" in room_type
+        assert "image_path" in room_type
+
+
+def test_get_my_room(client: TestClient, authenticated_user):
+    headers = {"Authorization": f"Bearer {authenticated_user['token']}"}
+    response = client.get("/api/room/", headers=headers)
+    assert response.status_code == 200
+    room_data = response.json()
+    assert "id" in room_data
+    assert "room_name" in room_data
+    assert "room_type" in room_data
+    assert "room_image_path" in room_data
+
+
+def test_update_room_name(client: TestClient, authenticated_user):
+    headers = {"Authorization": f"Bearer {authenticated_user['token']}"}
+    response = client.get("/api/room/", headers=headers)
+    new_name = "My Awesome Room"
+    response = client.put("/api/room/", json={"new_name": new_name}, headers=headers)
+
+    assert response.status_code == 200
+    assert response.json() == {"message": "Room name updated successfully"}
+
+    # Verify the change
+    response = client.get("/api/room/", headers=headers)
+    assert response.status_code == 200
+    assert response.json()["room_name"] == new_name
+
+
+def test_update_room_type(client: TestClient, authenticated_user):
+    headers = {"Authorization": f"Bearer {authenticated_user['token']}"}
+    response = client.get("/api/room/", headers=headers)
+    new_type = RoomTypes.ROOM_2.value
+
+    response = client.patch("/api/room/", json={"type": new_type}, headers=headers)
+    assert response.status_code == 200
+    updated_room = response.json()
+    assert updated_room["room_type"] == new_type
+
+
+def test_get_my_room_layout(client: TestClient, authenticated_user):
+    headers = {"Authorization": f"Bearer {authenticated_user['token']}"}
+    response = client.get("/api/room/layout", headers=headers)
+    assert response.status_code == 200
+    layout_data = response.json()
+    assert "room" in layout_data
+    assert "furniture" in layout_data
+    assert isinstance(layout_data["furniture"], list)
+
+
+def test_place_furniture(client: TestClient, authenticated_user):
+    headers = {"Authorization": f"Bearer {authenticated_user['token']}"}
+    placement_data = {
+        "furniture_name": Furniture.SOFA_0.value,
+        "x": 5,
+        "y": 5,
+    }
+    response = client.post("/api/room/furniture", json=placement_data, headers=headers)
+    assert response.status_code == 200
+    assert response.json() == {"message": "Furniture placed successfully"}
+
+    # Verify placement
+    layout_response = client.get("/api/room/layout", headers=headers)
+    assert layout_response.status_code == 200
+    new_layout = layout_response.json()
+    assert any(
+        item["furniture_name"] == placement_data["furniture_name"]
+        and item["x"] == placement_data["x"]
+        and item["y"] == placement_data["y"]
+        for item in new_layout["furniture"]
+    )
+
+    # Cleanup
+    client.delete(
+        f"/api/room/furniture?x={placement_data['x']}&y={placement_data['y']}&furniture_name={placement_data['furniture_name']}",
+        headers=headers,
+    )
+
+
+def test_remove_furniture(client: TestClient, authenticated_user):
+    headers = {"Authorization": f"Bearer {authenticated_user['token']}"}
+    placement_data = {
+        "furniture_name": Furniture.CHAIR_0.value,
+        "x": 1,
+        "y": 1,
+    }
+    # Place furniture first
+    client.post("/api/room/furniture", json=placement_data, headers=headers)
+
+    # Remove furniture
+    response = client.delete(
+        f"/api/room/furniture?x={placement_data['x']}&y={placement_data['y']}&furniture_name={placement_data['furniture_name']}",
+        headers=headers,
+    )
+    assert response.status_code == 200
+    assert response.json() == {"message": "Furniture removed successfully"}
+
+    # Verify removal
+    final_layout_response = client.get("/api/room/layout", headers=headers)
+    assert final_layout_response.status_code == 200
+    final_layout = final_layout_response.json()
+    assert not any(
+        item["furniture_name"] == placement_data["furniture_name"]
+        and item["x"] == placement_data["x"]
+        and item["y"] == placement_data["y"]
+        for item in final_layout["furniture"]
+    )
+
+
+def test_invalid_furniture_placement(client: TestClient, authenticated_user):
+    headers = {"Authorization": f"Bearer {authenticated_user['token']}"}
+
+    # Test with invalid coordinates (out of bounds)
+    invalid_coords_data = {
+        "furniture_name": Furniture.CHAIR_0.value,
+        "x": 11,
+        "y": -1,
+    }
+    response = client.post(
+        "/api/room/furniture", json=invalid_coords_data, headers=headers
+    )
+    assert response.status_code == 422  # Pydantic validation error
+
+    # Test collision
+    placement_data = {"furniture_name": Furniture.CHAIR_0.value, "x": 1, "y": 1}
+    # Place once
+    client.post("/api/room/furniture", json=placement_data, headers=headers)
+    # Try to place again in the same spot
+    response = client.post("/api/room/furniture", json=placement_data, headers=headers)
+    assert response.status_code == 400
+    assert "already placed" in response.json()["detail"]
+
+    # Cleanup
+    client.delete(
+        f"/api/room/furniture?x={placement_data['x']}&y={placement_data['y']}&furniture_name={placement_data['furniture_name']}",
+        headers=headers,
+    )
diff --git a/Backend/tests/test_user.py b/Backend/tests/test_user.py
new file mode 100644
index 0000000..48394c9
--- /dev/null
+++ b/Backend/tests/test_user.py
@@ -0,0 +1,68 @@
+from io import BytesIO
+
+
+def test_user_registration_and_login(client):
+    # Registration
+    user_data = {
+        "username": "testuser999",
+        "email": "test@example.com",
+        "password": "testpassword123",
+    }
+    response = client.post(
+        "/api/user/register",
+        data=user_data,
+        files={"file": ("a.jpg", BytesIO(b"aaa"), "image/jpeg")},
+    )
+
+    assert response.status_code == 201
+    assert response.json()["username"] == "testuser999"
+
+    # Duplicate registration
+    response = client.post(
+        "/api/user/register",
+        data=user_data,
+        files={"file": ("a.jpg", BytesIO(b"aaa"), "image/jpeg")},
+    )
+    assert response.status_code == 400
+    assert response.json()["detail"] == "Username already registered"
+
+    # Login
+    login_data = {
+        "username": "testuser999",
+        "password": "testpassword123",
+    }
+    response = client.post("/api/user/login", json=login_data)
+    assert response.status_code == 200
+    assert "access_token" in response.json()
+
+    # Login with wrong password
+    login_data["password"] = "wrongpassword"
+    response = client.post("/api/user/login", json=login_data)
+    assert response.status_code == 401
+    assert response.json()["detail"] == "Invalid username or password"
+
+    # delete
+    response = client.delete(f"/api/user/{user_data['username']}")
+    assert response.status_code == 200
+
+
+def test_get_user_profile(client, authenticated_user):
+    token = authenticated_user["token"]
+    username = authenticated_user["user_data"]["username"]
+    headers = {"Authorization": f"Bearer {token}"}
+
+    response = client.get(f"/api/user/profile/{username}", headers=headers)
+
+    assert response.status_code == 200
+    assert response.json()["username"] == username
+
+
+def test_user_delete(client, authenticated_user):
+    token = authenticated_user["token"]
+    username = authenticated_user["user_data"]["username"]
+    headers = {"Authorization": f"Bearer {token}"}
+
+    response = client.delete(f"/api/user/{username}", headers=headers)
+
+    assert response.status_code == 200
+    assert response.json()["detail"] == "User deleted"
diff --git a/Backend/utils/__init__.py b/Backend/utils/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/Backend/utils/db.py b/Backend/utils/db.py
new file mode 100644
index 0000000..863a9a7
--- /dev/null
+++ b/Backend/utils/db.py
@@ -0,0 +1,53 @@
+import aiosqlite
+from typing import Any, List, Tuple, Optional, Dict, Union
+
+DB_PATH = "database.sqlite3"
+
+# Generated by Github Copilot
+# db 사용을 편하게 하기 위한 함수
+
+
+async def get_db_connection(db_path: str = DB_PATH) -> aiosqlite.Connection:
+    return await aiosqlite.connect(db_path)
+
+
+async def execute(
+    query: str,
+    params: Union[Tuple[Any, ...], Dict[str, Any]] = (),
+    db_path: str = DB_PATH,
+) -> None:
+    async with aiosqlite.connect(db_path) as db:
+        await db.execute(query, params)
+        await db.commit()
+
+
+async def fetch_one(
+    query: str,
+    params: Union[Tuple[Any, ...], Dict[str, Any]] = (),
+    db_path: str = DB_PATH,
+) -> Optional[aiosqlite.Row]:
+    async with aiosqlite.connect(db_path) as db:
+        db.row_factory = aiosqlite.Row
+        async with db.execute(query, params) as cursor:
+            return await cursor.fetchone()
+
+
+async def fetch_all(
+    query: str,
+    params: Union[Tuple[Any, ...], Dict[str, Any]] = (),
+    db_path: str = DB_PATH,
+) -> List[aiosqlite.Row]:
+    async with aiosqlite.connect(db_path) as db:
+        db.row_factory = aiosqlite.Row
+        async with db.execute(query, params) as cursor:
+            return await cursor.fetchall()
+
+
+async def executemany(
+    query: str,
+    seq_of_params: List[Union[Tuple[Any, ...], Dict[str, Any]]],
+    db_path: str = DB_PATH,
+) -> None:
+    async with aiosqlite.connect(db_path) as db:
+        await db.executemany(query, seq_of_params)
+        await db.commit()
diff --git a/Backend/utils/default_queries.py b/Backend/utils/default_queries.py
new file mode 100644
index 0000000..e070ba7
--- /dev/null
+++ b/Backend/utils/default_queries.py
@@ -0,0 +1,168 @@
+class PhotoQueries:
+    CREATE_TABLE = """
+        CREATE TABLE IF NOT EXISTS photos (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            user_id INTEGER NOT NULL,
+            album_name TEXT NOT NULL,
+            image_path TEXT NOT NULL,
+            title TEXT,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
+        )
+    """
+
+    CREATE_COMMENTS_TABLE = """
+        CREATE TABLE IF NOT EXISTS photo_comments (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            photo_id INTEGER NOT NULL,
+            user_id INTEGER NOT NULL,
+            content TEXT NOT NULL,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            FOREIGN KEY (photo_id) REFERENCES photos (id) ON DELETE CASCADE,
+            FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
+        )
+    """
+
+    INSERT_PHOTO = """
+        INSERT INTO photos (user_id, album_name, image_path, title, created_at)
+        VALUES (?, ?, ?, ?, ?)
+    """
+
+    SELECT_USER_PHOTOS = """
+        SELECT * FROM photos 
+        WHERE user_id = ?
+        ORDER BY created_at DESC 
+        LIMIT ? OFFSET ?
+    """
+
+    SELECT_USER_PHOTOS_BY_ALBUM = """
+        SELECT * FROM photos 
+        WHERE user_id = ? AND album_name = ?
+        ORDER BY created_at DESC 
+        LIMIT ? OFFSET ?
+    """
+
+    SELECT_LATEST_USER_PHOTO = """
+        SELECT * FROM photos WHERE user_id = ? ORDER BY id DESC LIMIT 1
+    """
+
+    SELECT_PHOTO_OWNER = """
+        SELECT user_id FROM photos WHERE id = ?
+    """
+
+    SELECT_PHOTO_ALBUM_NAME = """
+        SELECT album_name FROM photos WHERE id = ? AND user_id = ?
+    """
+
+    INSERT_COMMENT = """
+        INSERT INTO photo_comments (photo_id, user_id, content, created_at)
+        VALUES (?, ?, ?, ?)
+    """
+
+    SELECT_LATEST_COMMENT = """
+        SELECT * FROM photo_comments WHERE photo_id = ? AND user_id = ? ORDER BY id DESC LIMIT 1
+    """
+
+    SELECT_PHOTO_COMMENTS = """
+        SELECT pc.*, u.username 
+        FROM photo_comments pc
+        JOIN users u ON pc.user_id = u.id
+        WHERE pc.photo_id = ?
+        ORDER BY pc.created_at ASC
+    """
+
+    SELECT_PHOTO_BY_ID = """
+        SELECT * FROM photos WHERE id = ? AND user_id = ?
+    """
+
+    DELETE_PHOTO = """
+        DELETE FROM photos WHERE id = ? AND user_id = ?
+    """
+
+    UPDATE_PHOTO_PATH = """
+        UPDATE photos SET image_path = ? WHERE id = ? AND user_id = ?
+    """
+
+
+class LetterQueries:
+    CREATE_TABLE = """
+        CREATE TABLE IF NOT EXISTS letters (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            sender_id INTEGER NOT NULL,
+            content TEXT NOT NULL,
+            FOREIGN KEY (sender_id) REFERENCES users (id) ON DELETE CASCADE
+        )
+    """
+
+    INSERT_LETTER = """
+        INSERT INTO letters (sender_id, content)
+        VALUES (?, ?)
+    """
+
+    SELECT_USER_LETTERS = """
+        SELECT * FROM letters 
+        WHERE sender_id = ?
+    """
+
+    SELECT_LATEST_USER_LETTER = """
+        SELECT * FROM letters WHERE sender_id = ? LIMIT 1
+    """
+
+    SELECT_LETTER_BY_ID = """
+        SELECT * FROM letters WHERE id = ? AND sender_id = ?
+    """
+
+    SELECT_LETTER_FOR_DELIVERY = """
+        SELECT * FROM letters WHERE id = ?
+    """
+
+    SELECT_SENDER_USERNAME = """
+        SELECT username FROM users WHERE id = ?
+    """
+
+    UPDATE_LETTER = """
+        UPDATE letters SET content = ? WHERE id = ? AND sender_id = ?
+    """
+
+    DELETE_LETTER = """
+        DELETE FROM letters WHERE id = ? AND sender_id = ?
+    """
+
+
+class DatabaseIndexes:
+    USER_INDEXES = [
+        "CREATE INDEX IF NOT EXISTS idx_users_username ON users(username)",
+        "CREATE INDEX IF NOT EXISTS idx_users_email ON users(email)",
+    ]
+
+    DIARY_INDEXES = [
+        "CREATE INDEX IF NOT EXISTS idx_diaries_user_id ON diaries(user_id)",
+        "CREATE INDEX IF NOT EXISTS idx_diaries_category ON diaries(category)",
+        "CREATE INDEX IF NOT EXISTS idx_diaries_created_at ON diaries(created_at)",
+    ]
+
+    PHOTO_INDEXES = [
+        "CREATE INDEX IF NOT EXISTS idx_photos_user_id ON photos(user_id)",
+        "CREATE INDEX IF NOT EXISTS idx_photos_album ON photos(album_name)",
+        "CREATE INDEX IF NOT EXISTS idx_photo_comments_photo_id ON photo_comments(photo_id)",
+    ]
+
+    FRIENDSHIP_INDEXES = [
+        "CREATE INDEX IF NOT EXISTS idx_friendships_user_id ON friendships(user_id)",
+        "CREATE INDEX IF NOT EXISTS idx_friendships_friend_id ON friendships(friend_id)",
+        "CREATE INDEX IF NOT EXISTS idx_friendships_status ON friendships(status)",
+    ]
+
+    LETTER_INDEXES = [
+        "CREATE INDEX IF NOT EXISTS idx_letters_sender_id ON letters(sender_id)",
+        "CREATE INDEX IF NOT EXISTS idx_letters_sent_date ON letters(sent_date)",
+    ]
+
+    AVATAR_INDEXES = [
+        "CREATE INDEX IF NOT EXISTS idx_avatars_user_id ON avatars(user_id)",
+    ]
+
+    GUEST_BOOK_INDEXES = [
+        "CREATE INDEX IF NOT EXISTS idx_guest_books_user_id ON guest_books(user_id)",
+        "CREATE INDEX IF NOT EXISTS idx_guest_books_created_at ON guest_books(created_at)",
+    ]
diff --git a/Backend/utils/email_processor.py b/Backend/utils/email_processor.py
new file mode 100644
index 0000000..4d6c5c7
--- /dev/null
+++ b/Backend/utils/email_processor.py
@@ -0,0 +1,75 @@
+import aiosmtplib
+from email.message import EmailMessage
+from typing import Optional
+import os
+from pydantic import EmailStr
+import ssl
+
+# aiosmtplib을 사용한 비동기 이메일 전송
+# EmailStr 사용
+
+
+class EmailProcessor:
+    def __init__(self):
+        self.smtp_server = os.getenv("SMTP_SERVER", "smtp.gmail.com")
+        self.smtp_port = int(os.getenv("SMTP_PORT", "587"))
+        self.sender_email = os.getenv("SENDER_EMAIL")
+        self.sender_password = os.getenv("SENDER_PASSWORD")
+        self.receiver_email = ""
+
+    async def send_email(
+        self,
+        subject: str,
+        content: str,
+        sender_email: EmailStr,
+        sender_password: str,
+        html_content: Optional[str] = None,
+    ) -> bool:
+        if not self.sender_email or not self.sender_password:
+            print("Email credentials not configured, cannot send email.")
+            return False
+
+        if not sender_email or not sender_password:
+            print(
+                "Warning: Email credentials (SENDER_EMAIL, SENDER_PASSWORD) "
+                "are not configured in environment variables."
+            )
+            return False
+
+        message = EmailMessage()
+        message["Subject"] = subject
+        message["From"] = sender_email
+        message["To"] = self.receiver_email
+        message.set_content(content)
+
+        # HTML 내용이 있는 경우, 대체 콘텐츠로 추가
+        if html_content:
+            message.add_alternative(html_content, subtype="html")
+
+        try:
+            # 포트 465는 SMTPS (implicit TLS)를 사용하고, 포트 587은 STARTTLS를 사용합니다.
+            use_tls = self.smtp_port == 465
+            context = ssl.create_default_context() if use_tls else None
+
+            await aiosmtplib.send(
+                message,
+                hostname=self.smtp_server,
+                port=self.smtp_port,
+                username=sender_email,
+                password=sender_password,
+                use_tls=use_tls,
+                ssl_context=context,
+                timeout=10,
+            )
+
+            print(f"Email sent successfully to {self.receiver_email}")
+            return True
+
+        except aiosmtplib.SMTPException as e:
+            print(f"SMTP error occurred while sending to {self.receiver_email}: {e}")
+            return False
+        except Exception as e:
+            print(
+                f"An unexpected error occurred while sending email to {self.receiver_email}: {e}"
+            )
+            return False
diff --git a/Backend/utils/image_processor.py b/Backend/utils/image_processor.py
new file mode 100644
index 0000000..e694725
--- /dev/null
+++ b/Backend/utils/image_processor.py
@@ -0,0 +1,179 @@
+import os
+import aiofiles
+from PIL import Image, ImageFilter, ImageEnhance
+from datetime import datetime
+from starlette.datastructures import UploadFile
+
+
+class ImageProcessor:
+    def __init__(self):
+        self.filter_dir = "uploads/filtered"
+        os.makedirs(self.filter_dir, exist_ok=True)
+
+    async def apply_filter(self, image_path: str, filter_type: str) -> str:
+        """Apply filter to image and return the path to filtered image"""
+
+        # Remove leading slash if exists for local file access
+        local_path = image_path.lstrip("/")
+
+        if not os.path.exists(local_path):
+            raise ValueError(f"Image file not found: {local_path}")
+
+        try:
+            with Image.open(local_path) as img:
+                # Convert to RGB if necessary
+                if img.mode != "RGB":
+                    img = img.convert("RGB")
+
+                filtered_img = self._apply_filter_effect(img, filter_type)
+
+                # Generate filtered image filename
+                base_name = os.path.basename(image_path)
+                name, ext = os.path.splitext(base_name)
+                filtered_filename = f"{name}_{filter_type}{ext}"
+                filtered_path = os.path.join(self.filter_dir, filtered_filename)
+
+                # Save filtered image
+                filtered_img.save(filtered_path, quality=85, optimize=True)
+
+                return f"/uploads/filtered/{filtered_filename}"
+
+        except Exception as e:
+            raise ValueError(f"Failed to apply filter: {str(e)}")
+
+    def _apply_filter_effect(self, img: Image.Image, filter_type: str) -> Image.Image:
+        """Apply specific filter effect to image"""
+        if filter_type == "none":
+            return img
+        elif filter_type == "vintage":
+            return self._apply_vintage_filter(img)
+        elif filter_type == "black_white":
+            return self._apply_black_white_filter(img)
+        elif filter_type == "sepia":
+            return self._apply_sepia_filter(img)
+        elif filter_type == "blur":
+            return self._apply_blur_filter(img)
+        elif filter_type == "sharpen":
+            return self._apply_sharpen_filter(img)
+        elif filter_type == "bright":
+            return self._apply_brightness_filter(img)
+        elif filter_type == "contrast":
+            return self._apply_contrast_filter(img)
+        else:
+            raise ValueError(f"Unknown filter type: {filter_type}")
+
+    def _apply_vintage_filter(self, img: Image.Image) -> Image.Image:
+        # Reduce saturation
+        enhancer = ImageEnhance.Color(img)
+        img = enhancer.enhance(0.7)
+
+        # Add slight warm tint
+        r, g, b = img.split()
+        r = ImageEnhance.Brightness(r).enhance(1.1)
+        g = ImageEnhance.Brightness(g).enhance(1.05)
+        b = ImageEnhance.Brightness(b).enhance(0.9)
+
+        return Image.merge("RGB", (r, g, b))
+
+    def _apply_black_white_filter(self, img: Image.Image) -> Image.Image:
+        return img.convert("L").convert("RGB")
+
+    def _apply_sepia_filter(self, img: Image.Image) -> Image.Image:
+        pixels = img.load()
+        width, height = img.size
+
+        for py in range(height):
+            for px in range(width):
+                r, g, b = pixels[px, py]
+
+                tr = int(0.393 * r + 0.769 * g + 0.189 * b)
+                tg = int(0.349 * r + 0.686 * g + 0.168 * b)
+                tb = int(0.272 * r + 0.534 * g + 0.131 * b)
+
+                pixels[px, py] = (min(255, tr), min(255, tg), min(255, tb))
+
+        return img
+
+    def _apply_blur_filter(self, img: Image.Image) -> Image.Image:
+        return img.filter(ImageFilter.GaussianBlur(radius=2))
+
+    def _apply_sharpen_filter(self, img: Image.Image) -> Image.Image:
+        return img.filter(ImageFilter.SHARPEN)
+
+    def _apply_brightness_filter(self, img: Image.Image) -> Image.Image:
+        enhancer = ImageEnhance.Brightness(img)
+        return enhancer.enhance(1.3)
+
+    def _apply_contrast_filter(self, img: Image.Image) -> Image.Image:
+        enhancer = ImageEnhance.Contrast(img)
+        return enhancer.enhance(1.2)
+
+    async def resize_image(
+        self, image_path: str, max_width: int = 800, max_height: int = 800
+    ) -> str:
+        """Resize image while maintaining aspect ratio"""
+
+        local_path = image_path.lstrip("/")
+
+        if not os.path.exists(local_path):
+            raise ValueError(f"Image file not found: {local_path}")
+
+        try:
+            with Image.open(local_path) as img:
+                # Calculate new size maintaining aspect ratio
+                img.thumbnail((max_width, max_height), Image.Resampling.LANCZOS)
+
+                # Generate resized image filename
+                base_name = os.path.basename(image_path)
+                name, ext = os.path.splitext(base_name)
+                resized_filename = f"{name}_resized{ext}"
+                resized_path = os.path.join(
+                    os.path.dirname(local_path), resized_filename
+                )
+
+                # Save resized image
+                img.save(resized_path, quality=85, optimize=True)
+
+                return f"/{resized_path}"
+
+        except Exception as e:
+            raise ValueError(f"Failed to resize image: {str(e)}")
+
+    async def validate_image_file(self, filename: str, file_size: int):
+        """Validate image file type and size"""
+
+        allowed_extensions = {".jpg", ".jpeg", ".png", ".gif", ".bmp", ".webp"}
+
+        # Check file extension
+        _, ext = os.path.splitext(filename.lower())
+        if ext not in allowed_extensions:
+            raise ValueError("Unsupported file type")
+
+        if file_size > 20 * 1024 * 1024:  # 20MB limit
+            raise ValueError("File size must be less than 20MB")
+
+    def get_safe_filename(self, filename: str) -> str:
+        """Generate safe filename by removing dangerous characters"""
+
+        import re
+
+        # Keep only alphanumeric characters, dots, and hyphens
+        safe_name = re.sub(r"[^a-zA-Z0-9._-]", "_", filename)
+
+        # Add timestamp to avoid collisions
+        name, ext = os.path.splitext(safe_name)
+        timestamp = int(datetime.now().timestamp())
+
+        return f"{name}_{timestamp}{ext}"
+
+    async def write_file_and_get_image_path(
+        self, file: UploadFile, upload_dir: str
+    ) -> str:
+        filename = self.get_safe_filename(file.filename)
+        file_path = os.path.join(upload_dir, filename)
+
+        async with aiofiles.open(file_path, "wb") as f:
+            content = await file.read()
+            await f.write(content)
+
+        return file_path
diff --git a/Backend/utils/queries/__init__.py b/Backend/utils/queries/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/Backend/utils/queries/avatar.py b/Backend/utils/queries/avatar.py
new file mode 100644
index 0000000..c6ebd95
--- /dev/null
+++ b/Backend/utils/queries/avatar.py
@@ -0,0 +1,25 @@
+class AvatarQueries:
+
+    CREATE_TABLE = """
+        CREATE TABLE IF NOT EXISTS avatars (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            user_id INTEGER UNIQUE NOT NULL,
+            avatar_type TEXT NOT NULL,
+            top_clothe_type TEXT,
+            bottom_clothe_type TEXT,
+            FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
+        )
+    """
+
+    SELECT_USER_AVATAR = """
+        SELECT * FROM avatars WHERE user_id = ?
+    """
+
+    INSERT_AVATAR = """
+        INSERT INTO avatars (user_id, avatar_type, top_clothe_type, bottom_clothe_type)
+        VALUES (?, ?, ?, ?)
+    """
+
+    UPDATE_AVATAR = """
+        UPDATE avatars SET {fields} WHERE user_id = ?
+    """
\ No newline at end of file
diff --git a/Backend/utils/queries/diary.py b/Backend/utils/queries/diary.py
new file mode 100644
index 0000000..04a38d1
--- /dev/null
+++ b/Backend/utils/queries/diary.py
@@ -0,0 +1,71 @@
+class DiaryQueries:
+
+    CREATE_TABLE = """
+        CREATE TABLE IF NOT EXISTS diaries (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            user_id INTEGER NOT NULL,
+            title TEXT NOT NULL,
+            content TEXT NOT NULL,
+            images TEXT,
+            category TEXT NOT NULL,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            is_submitted BOOLEAN DEFAULT FALSE,
+            email_sent BOOLEAN DEFAULT FALSE,
+            FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
+        )
+    """
+
+    INSERT_DIARY = """
+        INSERT INTO diaries (user_id, title, content, images, category, created_at, is_submitted, email_sent)
+        VALUES (?, ?, ?, ?, ?, ?, ?, ?)
+    """
+
+    SELECT_USER_DIARIES = """
+        SELECT * FROM diaries 
+        WHERE user_id = ?
+        ORDER BY created_at DESC 
+        LIMIT ? OFFSET ?
+    """
+
+    SELECT_USER_DIARIES_BY_CATEGORY = """
+        SELECT * FROM diaries 
+        WHERE user_id = ? AND category = ?
+        ORDER BY created_at DESC 
+        LIMIT ? OFFSET ?
+    """
+
+    SELECT_BY_ID = """
+        SELECT * FROM diaries WHERE id = ?
+    """
+
+    SELECT_BY_ID_WITH_USER_ID = """
+        SELECT * FROM diaries WHERE id = ? AND user_id = ? 
+    """
+
+    SELECT_LATEST_USER_DIARY = """
+        SELECT * FROM diaries WHERE user_id = ? ORDER BY id DESC LIMIT 1
+    """
+
+    SELECT_IMAGES_BY_ID = """
+        SELECT images FROM diaries WHERE id = ?
+    """
+
+    UPDATE_DIARY = """
+        UPDATE diaries SET {fields} WHERE id = ? AND user_id = ?
+    """
+
+    DELETE_DIARY = """
+        DELETE FROM diaries WHERE id = ? AND user_id = ?
+    """
+
+    UPDATE_SUBMISSION_STATUS = """
+        UPDATE diaries SET is_submitted = ? WHERE id = ? AND user_id = ?
+    """
+
+    UPDATE_EMAIL_SENT = """
+        UPDATE diaries SET email_sent = ? WHERE id = ?
+    """
+
+    UPDATE_DIARY_IMAGE_BY_ID = """
+        UPDATE diaries SET images = ? WHERE id = ?
+    """
diff --git a/Backend/utils/queries/friendship.py b/Backend/utils/queries/friendship.py
new file mode 100644
index 0000000..f019f2a
--- /dev/null
+++ b/Backend/utils/queries/friendship.py
@@ -0,0 +1,89 @@
+class FriendshipQueries:
+    """친구 관계 관련 쿼리"""
+
+    CREATE_TABLE = """
+        CREATE TABLE IF NOT EXISTS friendships (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            user_id INTEGER NOT NULL,
+            friend_id INTEGER NOT NULL,
+            status TEXT NOT NULL DEFAULT 'pending',
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE,
+            FOREIGN KEY (friend_id) REFERENCES users (id) ON DELETE CASCADE,
+            UNIQUE(user_id, friend_id)
+        )
+    """
+
+    SELECT_USER_BY_USERNAME = """
+        SELECT id FROM users WHERE username = ?
+    """
+
+    SELECT_EXISTING_FRIENDSHIP = """
+        SELECT * FROM friendships 
+        WHERE (user_id = ? AND friend_id = ?) OR (user_id = ? AND friend_id = ?)
+    """
+
+    INSERT_FRIENDSHIP = """
+        INSERT INTO friendships (user_id, friend_id, status, created_at)
+        VALUES (?, ?, ?, ?)
+    """
+
+    SELECT_FRIENDSHIP_BY_IDS = """
+        SELECT * FROM friendships WHERE user_id = ? AND friend_id = ?
+    """
+
+    SELECT_FRIENDSHIP_FOR_ACCEPT = """
+        SELECT f.*, u.username 
+        FROM friendships f
+        JOIN users u ON f.user_id = u.id
+        WHERE f.id = ? AND f.friend_id = ? AND f.status = ?
+    """
+
+    UPDATE_FRIENDSHIP_STATUS = """
+        UPDATE friendships SET status = ? WHERE id = ?
+    """
+
+    SELECT_USER_FRIENDSHIPS = """
+        SELECT f.*, u.username 
+        FROM friendships f
+        JOIN users u ON (
+            CASE 
+                WHEN f.user_id = ? THEN f.friend_id = u.id
+                ELSE f.user_id = u.id
+            END
+        )
+        WHERE (f.user_id = ? OR f.friend_id = ?) AND f.status = ?
+        ORDER BY f.created_at DESC
+    """
+
+    SELECT_USER_FRIENDSHIPS_BY_STATUS = """
+        SELECT f.*, u.username 
+        FROM friendships f
+        JOIN users u ON (
+            CASE 
+                WHEN f.user_id = ? THEN f.friend_id = u.id
+                ELSE f.user_id = u.id
+            END
+        )
+        WHERE (f.user_id = ? OR f.friend_id = ?) AND f.status = ?
+        ORDER BY f.created_at DESC
+    """
+
+    DELETE_FRIENDSHIP = """
+        DELETE FROM friendships 
+        WHERE id = ? AND (user_id = ? OR friend_id = ?)
+    """
+
+    SELECT_PENDING_REQUESTS = """
+        SELECT f.*, u.username 
+        FROM friendships f
+        JOIN users u ON f.user_id = u.id
+        WHERE f.friend_id = ? AND f.status = ?
+        ORDER BY f.created_at DESC
+    """
+
+    CHECK_FRIENDSHIP_STATUS = """
+        SELECT * FROM friendships 
+        WHERE ((user_id = ? AND friend_id = ?) OR (user_id = ? AND friend_id = ?))
+        AND status = 'accepted'
+    """
diff --git a/Backend/utils/queries/guestbook.py b/Backend/utils/queries/guestbook.py
new file mode 100644
index 0000000..33e7d13
--- /dev/null
+++ b/Backend/utils/queries/guestbook.py
@@ -0,0 +1,40 @@
+class GuestBookQueries:
+    CREATE_TABLE = """
+        CREATE TABLE IF NOT EXISTS guest_books (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            target_user_id INTEGER NOT NULL,
+            user_id INTEGER NOT NULL,
+            content TEXT NOT NULL,
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            FOREIGN KEY (user_id) REFERENCES users (id) ON DELETE CASCADE
+        )
+    """
+
+    INSERT_GUEST_BOOK = """
+        INSERT INTO guest_books (target_user_id, user_id, content, created_at)
+        VALUES (?, ?, ?, ?)
+    """
+
+    SELECT_TARGET_USER_GUEST_BOOKS = """
+        SELECT * FROM guest_books 
+        WHERE target_user_id = ?
+        ORDER BY created_at DESC 
+        LIMIT ? OFFSET ?
+    """
+
+    SELECT_GUEST_BOOK_BY_ID = """
+        SELECT * FROM guest_books WHERE id = ?
+    """
+
+    SELECT_GUEST_BOOK_BY_USER_ID = """
+        SELECT * FROM guest_books WHERE user_id = ? ORDER BY created_at DESC LIMIT 1
+    """
+
+    UPDATE_GUEST_BOOK_BY_ID = """
+        UPDATE guest_books SET content = ?, updated_at=CURRENT_TIMESTAMP WHERE id = ?
+    """
+
+    DELETE_GUEST_BOOK = """
+        DELETE FROM guest_books WHERE id = ? AND user_id = ?
+    """
diff --git a/Backend/utils/queries/room.py b/Backend/utils/queries/room.py
new file mode 100644
index 0000000..8c0f07b
--- /dev/null
+++ b/Backend/utils/queries/room.py
@@ -0,0 +1,81 @@
+class RoomQueries:
+    """마이 룸 관련 쿼리"""
+
+    CREATE_TABLE = """
+    CREATE TABLE IF NOT EXISTS rooms (
+        id INTEGER PRIMARY KEY,
+        user_id INTEGER UNIQUE,
+        room_name TEXT,
+        room_type TEXT
+    )
+    """
+    CREATE_TABLE_ROOM_FURNITURE = """
+        CREATE TABLE IF NOT EXISTS room_furnitures (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            room_id INTEGER NOT NULL,
+            furniture_name TEXT NOT NULL,
+            x INTEGER NOT NULL,
+            y INTEGER NOT NULL,
+            FOREIGN KEY (room_id) REFERENCES rooms(id) ON DELETE CASCADE
+        )
+    """
+
+    CREATE_TABLE_USER_FURNITURE = """
+        CREATE TABLE IF NOT EXISTS user_furnitures (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            user_id INTEGER NOT NULL,
+            furniture_name TEXT NOT NULL
+        )
+    """
+
+    INSERT_USER_FURNITURE = """
+        INSERT INTO user_furnitures (user_id, furniture_name) VALUES (?, ?)
+    """
+
+    INSERT_ROOM = """
+        INSERT INTO rooms (user_id, room_name, room_type) VALUES (?, ?, ?)
+    """
+
+    INSERT_ROOM_FURNITURE = """
+        INSERT INTO room_furnitures (room_id, furniture_name, x, y) VALUES (?, ?, ?, ?)
+    """
+
+    SELECT_ROOM_ID_BY_USER_ID = """
+        SELECT id FROM rooms WHERE user_id = ?
+    """
+
+    SELECT_ROOM_BY_ID = """
+        SELECT * FROM rooms WHERE id = ?
+    """
+
+    SELECT_FURNITURE = """
+        SELECT * FROM furnitures
+    """
+
+    SELECT_ROOM_FURNITURE = """
+        SELECT id, furniture_name, x, y FROM room_furnitures WHERE room_id = ?
+    """
+
+    SELECT_FURNITURE_ID_BY_X_Y = """
+        SELECT id FROM room_furnitures WHERE room_id = ? AND x = ? AND y = ?
+    """
+
+    SELECT_USER_FURNITURE = """
+        SELECT * FROM user_furnitures WHERE user_id = ?
+    """
+
+    UPDATE_ROOM_NAME = """
+        UPDATE rooms SET room_name = ? WHERE id = ?
+    """
+
+    UPDATE_ROOM_TYPE = """
+        UPDATE rooms SET room_type = ? WHERE id = ?
+    """
+
+    DELETE_FURNITURE = """
+        DELETE FROM room_furnitures WHERE room_id = ? AND x = ? AND y = ?
+    """
+
+    SELECT_ROOM_BY_USER_ID = """
+        SELECT * FROM rooms WHERE user_id = ?
+    """
diff --git a/Backend/utils/queries/user.py b/Backend/utils/queries/user.py
new file mode 100644
index 0000000..96dbe04
--- /dev/null
+++ b/Backend/utils/queries/user.py
@@ -0,0 +1,61 @@
+class UserQueries:
+    """사용자 관련 쿼리"""
+
+    CREATE_TABLE = """
+        CREATE TABLE IF NOT EXISTS users (
+            id INTEGER PRIMARY KEY AUTOINCREMENT,
+            username TEXT UNIQUE NOT NULL,
+            email TEXT UNIQUE NOT NULL,
+            password_hash TEXT NOT NULL,
+            salt TEXT NOT NULL,
+            profile_image_path TEXT DEFAULT 'upload/profile/default.jpg',
+            created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+            is_active BOOLEAN DEFAULT TRUE
+        )
+    """
+
+    INSERT_USER_WITHOUT_PROFILE = """
+        INSERT INTO users (username, email, password_hash, salt)
+        VALUES (?, ?, ?, ?)
+    """
+
+    INSERT_USER_WITH_PROFILE = """
+        INSERT INTO users (username, email, password_hash, salt, profile_image_path)
+        VALUES (?, ?, ?, ?, ?)
+    """
+
+    SELECT_BY_USERNAME = """
+        SELECT * FROM users WHERE username = ?
+    """
+
+    SELECT_BY_EMAIL = """
+        SELECT * FROM users WHERE email = ?
+    """
+
+    SELECT_BY_ID = """
+        SELECT * FROM users WHERE id = ?
+    """
+
+    SELECT_BY_USERNAME_LIKE = """
+        SELECT * FROM users WHERE username LIKE ?
+    """
+
+    DELETE_USER_BY_USERNAME = """
+        DELETE FROM users WHERE username = ?
+    """
+
+    UPDATE_PROFILE_IMAGE_PATH_BY_USERNAME = """
+        UPDATE users SET profile_image_path = ? WHERE username = ?
+    """
+
+    UPDATE_PROFILE_IMAGE_PATH_BY_ID = """
+        UPDATE users SET profile_image_path = ? WHERE id = ?
+    """
+
+    UPDATE_USER_BY_ID = """
+        UPDATE users SET {} WHERE id = ?
+    """
+
+    SELECT_USER_BY_EMAIL_AND_NOT_ID = """
+        SELECT * FROM users WHERE email = ? AND id != ?
+    """
diff --git a/Backend/utils/run_server.py b/Backend/utils/run_server.py
new file mode 100644
index 0000000..a42b550
--- /dev/null
+++ b/Backend/utils/run_server.py
@@ -0,0 +1,64 @@
+import sys
+import os
+from pathlib import Path
+from fastapi import FastAPI
+from fastapi.staticfiles import StaticFiles
+from fastapi.middleware.cors import CORSMiddleware
+
+# 프로젝트 루트를 Python 경로에 추가
+project_root = Path(__file__).parent
+sys.path.insert(0, str(project_root))
+
+
+app = FastAPI(
+    title="싸이월드 - 추억 속으로",
+    description="2000년대 감성의 소셜 네트워크 서비스",
+    version="1.0.0",
+)
+
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+app.mount("/uploads", StaticFiles(directory="uploads"), name="uploads")
+app.mount("/public", StaticFiles(directory="public"), name="public")
+
+
+# 정적 파일 서빙
+async def init_folders(app: FastAPI):
+    app.mount("/uploads", StaticFiles(directory="uploads"), name="uploads")
+
+
+async def init_db():
+
+    for service in os.listdir("Backend/services"):
+        try:
+            if service.endswith(".py"):
+                module_name = "Backend.services." + service[:-3]
+                module = __import__(module_name, fromlist=[""])
+                service_class_name = service[:-3].split("_")[0] + "Service"
+                service_class_name = service_class_name.replace(
+                    service_class_name[0], service_class_name[0].upper(), 1
+                )
+                service_class = getattr(module, service_class_name)
+
+                await service_class.init_db()
+                print(f"{service_class_name} : init_db")
+
+        except Exception as e:
+            print(f"failed to init_db {service}")
+            print(e)
+
+
+async def startup_event():
+    await init_folders(app)
+    await init_db()
+
+
+def init_FastAPI() -> FastAPI:
+    app.add_event_handler("startup", startup_event)
+    return app
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..dbe88ba
--- /dev/null
+++ b/README.md
@@ -0,0 +1,49 @@
+## 2025 AnA SSF - 나만의 싸이월드 만들기
+
+### 소개
+2000년대 감성을 담은 소셜 네트워크 서비스 '싸이월드'를 직접 구현해보는 프로젝트입니다.
+사진 업로드, 미니홈피, 도토리, 방명록 등 주요 기능들을 구현했습니다.
+
+### 기술 스택
+ - 프론트엔드 : Qwik-city, Tailwind CSS
+ - 백엔드 : FastAPI
+ - 데이터베이스 : SQLite
+ - 배포 : git
+
+### 주요 기능
+ - 회원가입 / 로그인
+ - 프로필 사진 업로드 및 방 꾸미기
+ - 방명록 작성
+ - 도토리 상점
+
+### 프로젝트 구조 
+2025-SSF-Internal\
+├── Backend\
+│   ├── __init__.py\
+│   ├── models\
+│   ├── routes\
+│   └── ...\
+└── README.md
+
+### 실행 방법
+1. 프론트엔드\
+git clone https://github.com/sunrin-ana/2025-SSF-Frontend.git \
+npm install\
+npm run
+
+2. 백엔드\
+git clone https://github.com/sunrin-ana/2025-SSF.git \
+pip install -r requirements.txt\
+uvicorn Backed:app --reload
+
+### 개발 기간
+2025-05-30 ~ 2025-09-12
+
+### 팀원
+장한울 - diary, ~~photo~~, ~~letter~~, store\
+고윤 - avatar, room\
+김건우 - user, friendship\
+김주영 - dotory-manage server, frontend
+
+### 참고자료
+싸이월드 미니홈피 소개
diff --git a/api.json b/api.json
new file mode 100644
index 0000000..9cda915
--- /dev/null
+++ b/api.json
@@ -0,0 +1 @@
+{"openapi":"3.1.0","info":{"title":"FastAPI","version":"0.1.0"},"paths":{"/register":{"post":{"tags":["user"],"summary":"Register User","operationId":"register_user_register_post","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/UserCreate"}}},"required":true},"responses":{"201":{"description":"Successful Response","content":{"application/json":{"schema":{"$ref":"#/components/schemas/UserResponse"}}}},"422":{"description":"Validation Error","content":{"application/json":{"schema":{"$ref":"#/components/schemas/HTTPValidationError"}}}}}}},"/login":{"post":{"tags":["user"],"summary":"Login User","operationId":"login_user_login_post","requestBody":{"content":{"application/json":{"schema":{"$ref":"#/components/schemas/UserLogin"}}},"required":true},"responses":{"200":{"description":"Successful Response","content":{"application/json":{"schema":{}}}},"422":{"description":"Validation 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