diff --git a/src/spaceone/identity/interface/grpc/workspace_group_user.py b/src/spaceone/identity/interface/grpc/workspace_group_user.py
index 2830d9f..f5b24a9 100644
--- a/src/spaceone/identity/interface/grpc/workspace_group_user.py
+++ b/src/spaceone/identity/interface/grpc/workspace_group_user.py
@@ -1,4 +1,6 @@
+from google.protobuf.json_format import ParseDict
 from spaceone.api.identity.v2 import (
+    workspace_group_pb2,
     workspace_group_user_pb2,
     workspace_group_user_pb2_grpc,
 )
@@ -19,19 +21,19 @@ def add(self, request, context):
         params, metadata = self.parse_request(request, context)
         workspace_group_user_svc = WorkspaceGroupUserService(metadata)
         response: dict = workspace_group_user_svc.add(params)
-        return self.dict_to_message(response)
+        return ParseDict(response, workspace_group_pb2.WorkspaceGroupInfo())
 
     def remove(self, request, context):
         params, metadata = self.parse_request(request, context)
         workspace_group_user_svc = WorkspaceGroupUserService(metadata)
         response: dict = workspace_group_user_svc.remove(params)
-        return self.dict_to_message(response)
+        return ParseDict(response, workspace_group_pb2.WorkspaceGroupInfo())
 
     def update_role(self, request, context):
         params, metadata = self.parse_request(request, context)
         workspace_group_user_svc = WorkspaceGroupUserService(metadata)
         response: dict = workspace_group_user_svc.update_role(params)
-        return self.dict_to_message(response)
+        return ParseDict(response, workspace_group_pb2.WorkspaceGroupInfo())
 
     def find(self, request, context):
         params, metadata = self.parse_request(request, context)
@@ -43,13 +45,13 @@ def get(self, request, context):
         params, metadata = self.parse_request(request, context)
         workspace_group_user_svc = WorkspaceGroupUserService(metadata)
         response: dict = workspace_group_user_svc.get(params)
-        return self.dict_to_message(response)
+        return ParseDict(response, workspace_group_pb2.WorkspaceGroupInfo())
 
     def list(self, request, context):
         params, metadata = self.parse_request(request, context)
         workspace_group_user_svc = WorkspaceGroupUserService(metadata)
         response: dict = workspace_group_user_svc.list(params)
-        return self.dict_to_message(response)
+        return ParseDict(response, workspace_group_pb2.WorkspaceGroupsInfo())
 
     def stat(self, request, context):
         params, metadata = self.parse_request(request, context)