diff --git a/src/spaceone/identity/service/workspace_group_service.py b/src/spaceone/identity/service/workspace_group_service.py
index 8a0b5e5..0ecb8ac 100644
--- a/src/spaceone/identity/service/workspace_group_service.py
+++ b/src/spaceone/identity/service/workspace_group_service.py
@@ -205,7 +205,7 @@ def add_users(
         params.users = old_users_in_workspace_group + new_users_in_workspace_group
 
         workspace_group_vo = self.workspace_group_mgr.update_workspace_group_by_vo(
-            params.dict(exclude_unset=True), workspace_group_vo
+            params.dict(exclude_unset=False), workspace_group_vo
         )
 
         workspace_group_info = self.add_user_name_and_state_to_users(