diff --git a/app/src/main/java/com/gamedog/vididin/features/zero/ZeroBuyActivity.kt b/app/src/main/java/com/gamedog/vididin/features/zero/ZeroBuyActivity.kt
index f010ea1..8008b0f 100644
--- a/app/src/main/java/com/gamedog/vididin/features/zero/ZeroBuyActivity.kt
+++ b/app/src/main/java/com/gamedog/vididin/features/zero/ZeroBuyActivity.kt
@@ -223,12 +223,16 @@ class ZeroBuyActivity : AppViewsEmptyViewModelActivity<ViewBinding>() {
     }
 
     private fun updateItemUI(joinedItem: ZeroBuyItem?) {
-        val currentList = mAdapter.currentList.toMutableList()
-        val indexToUpdate = currentList.indexOfFirst { it.id == joinedItem?.id }
-        if (indexToUpdate != -1) {
-            currentList.removeAt(indexToUpdate)
-            currentList.add(indexToUpdate, joinedItem)
-            mAdapter.submitList(currentList)
+        if (joinedItem == null) {
+            mAdapter.notifyDataSetChanged()
+        } else {
+            val currentList = mAdapter.currentList.toMutableList()
+            val indexToUpdate = currentList.indexOfFirst { it.id == joinedItem?.id }
+            if (indexToUpdate != -1) {
+                currentList.removeAt(indexToUpdate)
+                currentList.add(indexToUpdate, joinedItem)
+                mAdapter.submitList(currentList)
+            }
         }
     }
 
diff --git a/app/src/main/java/com/gamedog/vididin/features/zero/ZeroBuyViewModel.kt b/app/src/main/java/com/gamedog/vididin/features/zero/ZeroBuyViewModel.kt
index e3708e0..1ced775 100644
--- a/app/src/main/java/com/gamedog/vididin/features/zero/ZeroBuyViewModel.kt
+++ b/app/src/main/java/com/gamedog/vididin/features/zero/ZeroBuyViewModel.kt
@@ -20,7 +20,10 @@ import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.launch
 
+
+
 class ZeroBuyViewModel : ViewModel() {
+    private val CODE_HAS_JOINED_BEFORE: Int = 10003
     private val _ZeroBuyListData = MutableStateFlow<Result<ZeroBuyResp>>(Result.Loading)
     val ZeroBuyListData: StateFlow<Result<ZeroBuyResp>> = _ZeroBuyListData.asStateFlow()
 
@@ -51,18 +54,22 @@ class ZeroBuyViewModel : ViewModel() {
                     val respObj = AndroidUtil.json2Object<ZeroBuyResp>(result.data.string())
 
 
-                    respObj?.contentObj?.let {
-                        val itemId = respObj.contentObj?.id
-                        if ((respObj.code == 0 || respObj.code == 10003) && itemId != null && itemId > 0) {
-                            val mutableJoinedIdList = if(joinZeroBuyItemIds == null) mutableListOf<Int>() else joinZeroBuyItemIds.toMutableList()
-                            mutableJoinedIdList.add(itemId)
-                            SpUtil.instance().putList(SpUtil.KEY_ZEROBUY_JOINED_ACTIVITY_IDS, mutableJoinedIdList)
+                    respObj?.let {
+                        if (it.code == CODE_HAS_JOINED_BEFORE || it.code == 0) {
+                            // save
+                            val joinedActivityList = if(joinZeroBuyItemIds == null) mutableListOf<Int>() else joinZeroBuyItemIds.toMutableList()
+                            if (!joinedActivityList.contains(itemId)) {
+                                joinedActivityList.add(itemId)
+                                SpUtil.instance().putList(SpUtil.KEY_ZEROBUY_JOINED_ACTIVITY_IDS, joinedActivityList)
+                            }
 
-                            _ZeroBuyJoinResult.value = Result.Success(respObj?.contentObj)
+                            // flow set
+                            _ZeroBuyJoinResult.value = Result.Success(it.current_purchases[0])
+
+                            // return
                             return@launch
                         }
                     }
-
                     _ZeroBuyJoinResult.value = Result.Error(Throwable("empty response"))
                 }
                 is Result.Error -> {