diff --git a/src/client.ts b/src/client.ts
index 729f8dc..709dc8b 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -62,9 +62,9 @@ export default class Comcigan {
     const now = data[`자료${dayCode}`] as number[][][][]
 
     const getSubject = (code?: number) =>
-      code ? subjects[(code / 10 ** (teachersLen + 1)) | 0] : '없음'
+      code ? subjects[(code / 10 ** (teachersLen + 1)) | 0] : ''
     const getTeacher = (code?: number) =>
-      code ? teachers[code % 10 ** teachersLen] : '없음'
+      code ? teachers[code % 10 ** teachersLen] : ''
 
     return mergeMap(now.slice(1), original.slice(1), (gNow, gOrigin) =>
       mergeMap(gNow.slice(1), gOrigin.slice(1), (cNow, cOrigin) =>