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 a256e92..bd1317e 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
@@ -110,4 +110,12 @@ interface TecnologiaApi {
         @Path("room_id") roomId: String,
         @Part file: MultipartBody.Part
     ): Response<Message>
+
+    //get emoji reaction
+    @GET("api/dm/{room_id}/messages/{msg_id}/reactions/{emoji}")
+    suspend fun getMessageReactionUsers(
+        @Path("room_id") roomId: String,
+        @Path("msg_id") msgId: String,
+        @Path("emoji") emoji: String
+    ): Response<MessageReactionUsersResponse>
 }
\ No newline at end of file
diff --git a/app/src/main/java/com/example/login_v3/data/api/api_class/DM_Basic.kt b/app/src/main/java/com/example/login_v3/data/api/api_class/DM_Basic.kt
index f2559a3..0c1d650 100644
--- a/app/src/main/java/com/example/login_v3/data/api/api_class/DM_Basic.kt
+++ b/app/src/main/java/com/example/login_v3/data/api/api_class/DM_Basic.kt
@@ -51,18 +51,6 @@ data class LastMessage(
     @Json(name = "forwarded_from_id") val forwardedFromId: String?,
     @Json(name = "forwarded_from_room_id") val forwardedFromRoomId: String?
 )
-@JsonClass(generateAdapter = true)
-data class Attachment(
-    @Json(name = "filename") val filename: String,
-    @Json(name = "mime_type") val mimeType: String,
-    @Json(name = "size") val size: Long
-)
-@JsonClass(generateAdapter = true)
-data class Reaction(
-    @Json(name = "emoji") val emoji: String = "",
-    @Json(name = "count") val count: Int = 0,
-    @Json(name = "me_reacted") val meReacted: Boolean = false
-)
 
 val Partner.fullContactAvatarUrl: Any
     get() = if (avatarUrl.isNullOrBlank()) {
@@ -76,6 +64,22 @@ val Partner.fullContactAvatarUrl: Any
 
 
 //Message DM
+// 抽到最外層，讓 ChatRoom、LastMessage、Message 共同使用
+@JsonClass(generateAdapter = true)
+data class Attachment(
+    @Json(name = "filename") val filename: String,
+    @Json(name = "mime_type") val mimeType: String,
+    @Json(name = "size") val size: Long
+)
+
+@JsonClass(generateAdapter = true)
+data class Reaction(
+    @Json(name = "emoji") val emoji: String = "",
+    @Json(name = "count") val count: Int = 0,
+    @Json(name = "me_reacted") val meReacted: Boolean = false
+)
+
+// --- Message DM 相關 ---
 @JsonClass(generateAdapter = true)
 data class MessageResponse(
     @Json(name = "has_more") val hasMore: Boolean,
@@ -97,27 +101,14 @@ data class Message(
     @Json(name = "is_edited") val isEdited: Boolean,
     @Json(name = "is_deleted") val isDeleted: Boolean,
     @Json(name = "reply_to_id") val replyToId: String? = null,
-    @kotlin.jvm.Transient // 讓某些序列化工具忽略，Moshi 預設也會忽略沒有 @Json 的 var
+    @kotlin.jvm.Transient
     var repliedMessage: Message? = null,
 
     @Json(name = "forwarded_from_id") val forwardedFromId: String? = null,
     @Json(name = "forwarded_from_room_id") val forwardedFromRoomId: String? = null,
-    @Json(name = "attachment") val attachment: Attachment? = null,
-    @Json(name = "reactions") val reactions: List<Reaction>? = emptyList()
-){
-    @JsonClass(generateAdapter = true)
-    data class Attachment(
-        @Json(name = "filename") val filename: String,
-        @Json(name = "mime_type") val mimeType: String,
-        @Json(name = "size") val size: Long
-    )
-    @JsonClass(generateAdapter = true)
-    data class Reaction(
-        @Json(name = "emoji") val emoji: String,
-        @Json(name = "count") val count: Int,
-        @Json(name = "me_reacted") val meReacted: Boolean
-    )
-}
+    @Json(name = "attachment") val attachment: Attachment? = null, // 直接使用外層的 Attachment
+    @Json(name = "reactions") val reactions: List<Reaction>? = emptyList() // 直接使用外層的 Reaction
+)
 
 //send message
 @JsonClass(generateAdapter = true)
diff --git a/app/src/main/java/com/example/login_v3/data/repository/dm/DM_Basic_Repository.kt b/app/src/main/java/com/example/login_v3/data/repository/dm/DM_Basic_Repository.kt
index 24d1b93..431340d 100644
--- a/app/src/main/java/com/example/login_v3/data/repository/dm/DM_Basic_Repository.kt
+++ b/app/src/main/java/com/example/login_v3/data/repository/dm/DM_Basic_Repository.kt
@@ -8,6 +8,7 @@ import android.provider.OpenableColumns
 import com.example.login_v3.data.api.TecnologiaApi
 import com.example.login_v3.data.api.api_class.ChatRoom
 import com.example.login_v3.data.api.api_class.Message
+import com.example.login_v3.data.api.api_class.MessageReactionUsersResponse
 import com.example.login_v3.data.api.api_class.MessageResponse
 import com.example.login_v3.data.api.api_class.RoomListResponse
 import com.example.login_v3.data.api.api_class.SendMessageRequest
@@ -219,4 +220,31 @@ class ChatRoomsRepository @Inject constructor(
             Result.failure(e)
         }
     }
+
+    // 取得點擊特定訊息中某個 Emoji 的使用者清單
+    suspend fun getMessageReactionUsers(
+        roomId: String,
+        messageId: String,
+        emoji: String
+    ): Result<MessageReactionUsersResponse> {
+        return try {
+            // 呼叫 API
+            val response = api.getMessageReactionUsers(roomId, messageId, emoji)
+
+            if (response.isSuccessful) {
+                val body = response.body()
+                if (body != null) {
+                    Result.success(body)
+                } else {
+                    Result.failure(Exception("回應成功但回應身體為空 (Empty response body)"))
+                }
+            } else {
+                val errorMsg = response.errorBody()?.string() ?: "未知錯誤"
+                Result.failure(Exception("取得反應使用者失敗，錯誤碼: ${response.code()}, 訊息: $errorMsg"))
+            }
+        } catch (e: Exception) {
+            // 捕捉網路斷線等異常狀況
+            Result.failure(e)
+        }
+    }
 }
\ No newline at end of file