diff --git a/.env b/.env
new file mode 100644
index 0000000..cf32153
--- /dev/null
+++ b/.env
@@ -0,0 +1,2 @@
+# Google OAuth 설정
+GOOGLE_ID=bot.imnya.ng@gmail.com
diff --git a/.env.example b/.env.example
new file mode 100644
index 0000000..cf32153
--- /dev/null
+++ b/.env.example
@@ -0,0 +1,2 @@
+# Google OAuth 설정
+GOOGLE_ID=bot.imnya.ng@gmail.com
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 32a975c..09915cc 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,6 +26,10 @@ jobs:
 
       - name: Install dependencies
         run: uv sync
+      
+      - name: Set up environment variables
+        run: |
+          echo "GOOGLE_ID=bot.imnya.ng@gmail.com" > .env
 
       - name: Start application and run proxy test
         run: |
@@ -37,7 +41,12 @@ jobs:
             sleep 5
             
             # Test proxy functionality
-            curl -x http://localhost:11080 http://example.com
+            sudo cp ~/.mitmproxy/mitmproxy-ca-cert.pem /usr/local/share/ca-certificates/mitmproxy-ca-cert.crt
+            sudo update-ca-certificates
+
+            mkdir data
+            echo https://github.com > ./data/target.dump
+            curl -k -x https://localhost:11080 "https://github.com/login/oauth/authorize?client_id=Ov23lixietSCQOHxPvcr&redirect_uri=http://localhost:8787&scope=read:user+user:email&response_type=code&code_challenge=abc123&code_challenge_method=S256"
             
             # Clean up
             kill $APP_PID
diff --git a/addon/GoogleLoginHint.py b/addon/GoogleLoginHint.py
new file mode 100644
index 0000000..6d80669
--- /dev/null
+++ b/addon/GoogleLoginHint.py
@@ -0,0 +1,71 @@
+import lib.target as target
+from lib.report import save_report
+import os
+from urllib.parse import urlparse, parse_qs, urlencode, urlunparse
+from dotenv import load_dotenv
+
+# .env 파일 로드
+load_dotenv(override=True)
+
+class GoogleLoginHint:
+    def __init__(self):
+        self.google_id = os.getenv('GOOGLE_ID', '')
+        if not self.google_id:
+            print("⚠️  Warning: GOOGLE_ID not found in .env file")
+    
+    async def request(self, flow):
+        """Google OAuth 요청을 가로채서 login_hint를 추가하거나 수정"""
+        req = flow.request
+        method = req.method
+        url = req.pretty_url
+        
+        # Google OAuth 인증 URL인지 확인
+        if self._is_google_oauth_url(url):
+            print(f"🔍 Google OAuth URL detected: {url}")
+            
+            # URL 파싱
+            parsed_url = urlparse(url)
+            query_params = parse_qs(parsed_url.query)
+            
+            # login_hint 추가 또는 수정
+            if self.google_id:
+                query_params['login_hint'] = [self.google_id]
+                print(f"✅ Added/Updated login_hint: {self.google_id}")
+                
+                # 새로운 쿼리 스트링 생성
+                new_query = urlencode(query_params, doseq=True)
+                
+                # 새로운 URL 생성
+                new_url = urlunparse((
+                    parsed_url.scheme,
+                    parsed_url.netloc,
+                    parsed_url.path,
+                    parsed_url.params,
+                    new_query,
+                    parsed_url.fragment
+                ))
+                
+                # 요청 URL 수정
+                flow.request.pretty_url = new_url
+                print(f"🔄 Modified URL: {new_url}")
+                
+    
+    def _is_google_oauth_url(self, url):
+        """Google OAuth URL인지 확인"""
+        google_oauth_domains = [
+            'accounts.google.com',
+            'oauth2.googleapis.com'
+        ]
+        
+        parsed_url = urlparse(url)
+        domain = parsed_url.netloc.lower()
+        
+        # Google OAuth 도메인 확인
+        for google_domain in google_oauth_domains:
+            if google_domain in domain:
+                # OAuth 관련 경로 확인
+                path = parsed_url.path.lower()
+                if any(oauth_path in path for oauth_path in ['/oauth2', '/auth', '/login']):
+                    return True
+        
+        return False
\ No newline at end of file
diff --git a/addon/init.py b/addon/init.py
index 78e616a..c54a7fc 100644
--- a/addon/init.py
+++ b/addon/init.py
@@ -6,6 +6,11 @@ from csrf_check import CsrfChecker
 from nonce_check import NonceChecker
 from redirect_uri_check import RedirectBypassChecker
 from access_token import AccessTokenScanner
+from GoogleLoginHint import GoogleLoginHint
+import os
+from dotenv import load_dotenv
+
+load_dotenv(override=True)
 
 class PKCEAddon:
     def __init__(self):
@@ -87,4 +92,19 @@ class RedirectBypassAddon:
         except Exception as e:
             print(f"[ERROR] RedirectBypass Addon failed: {e}")
 
-addons = [PKCEAddon(), ScopeAddon(), CsrfAddon(), NonceAddon(), AccessTokenAddon(), RedirectBypassAddon()]
+class GoogleLoginHintAddon():
+    def __init__(self) -> None:
+        if os.getenv('GOOGLE_ID'):
+            self.checker = GoogleLoginHint()
+        else:
+            self.checker = None
+    
+    async def request(self, flow: http.HTTPFlow):
+        if self.checker is None:
+            return
+        try:
+            await self.checker.request(flow)
+        except Exception as e:
+            print(f"[ERROR] GoogleLoginHint Addon failed: {e}")
+
+addons = [PKCEAddon(), ScopeAddon(), CsrfAddon(), NonceAddon(), AccessTokenAddon(), RedirectBypassAddon(), GoogleLoginHintAddon()]