diff --git a/app/src/main/java/com/example/login_v3/data/api/Main_API_Service.kt b/app/src/main/java/com/example/login_v3/data/api/Main_API_Service.kt
index e47b8d6..da4272c 100644
--- a/app/src/main/java/com/example/login_v3/data/api/Main_API_Service.kt
+++ b/app/src/main/java/com/example/login_v3/data/api/Main_API_Service.kt
@@ -14,7 +14,7 @@ interface TecnologiaApi {
 
     // 註冊：建議路徑 api/auth/register
     @POST("api/auth/register")
-    suspend fun register(@Body body: RegisterRequest): Response<ApiResponse>
+    suspend fun register(@Body body: RegisterRequest): Response<RegisterResponse>
 
     // 登入：將回傳值包裹在 Response 中
     @POST("api/auth/login")
diff --git a/app/src/main/java/com/example/login_v3/data/api/api_class/AuthRequest_Response.kt b/app/src/main/java/com/example/login_v3/data/api/api_class/AuthRequest_Response.kt
index 1c9a286..de3feec 100644
--- a/app/src/main/java/com/example/login_v3/data/api/api_class/AuthRequest_Response.kt
+++ b/app/src/main/java/com/example/login_v3/data/api/api_class/AuthRequest_Response.kt
@@ -15,7 +15,7 @@ data class LoginResponse(
 
 @JsonClass(generateAdapter = true)
 data class RegisterRequest(
-    @Json(name = "display_name") val displayName: String, // 將 JSON 的底線對應到 Kotlin 的駝峰
+    @field:Json(name = "display_name") val displayName: String,
     val email: String,
     val password: String,
     val username: String
diff --git a/app/src/main/java/com/example/login_v3/data/repository/basic/Auth_Repository.kt b/app/src/main/java/com/example/login_v3/data/repository/basic/Auth_Repository.kt
index adb4a16..7592bb3 100644
--- a/app/src/main/java/com/example/login_v3/data/repository/basic/Auth_Repository.kt
+++ b/app/src/main/java/com/example/login_v3/data/repository/basic/Auth_Repository.kt
@@ -2,7 +2,10 @@ package com.example.login_v3.data.repository.basic
 
 import com.example.login_v3.data.api.TecnologiaApi
 import com.example.login_v3.data.api.api_class.ApiResponse
+import com.example.login_v3.data.api.api_class.LoginRequest
+import com.example.login_v3.data.api.api_class.LoginResponse
 import com.example.login_v3.data.api.api_class.RegisterRequest
+import com.example.login_v3.data.api.api_class.RegisterResponse
 import retrofit2.Response
 import javax.inject.Inject
 
@@ -13,10 +16,12 @@ class AuthRepository @Inject constructor(
      * 處理用戶註冊
      * 回傳 Response<ApiResponse>，讓 ViewModel 可以根據 isSuccessful 判斷結果
      */
-    suspend fun register(request: RegisterRequest): Response<ApiResponse> {
+    suspend fun register(request: RegisterRequest): Response<RegisterResponse> {
         return api.register(request)
     }
 
-    // 你也可以在這裡加入其他的 Auth 相關功能，例如登入
-    // suspend fun login(request: LoginRequest) = api.login(request)
+    // 登入功能預留
+    suspend fun login(request: LoginRequest): Response<LoginResponse> {
+        return api.login(request)
+    }
 }
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