diff --git a/src/spaceone/identity/manager/role_binding_manager.py b/src/spaceone/identity/manager/role_binding_manager.py
index 57446eb..7d0073e 100644
--- a/src/spaceone/identity/manager/role_binding_manager.py
+++ b/src/spaceone/identity/manager/role_binding_manager.py
@@ -17,10 +17,7 @@ def __init__(self, *args, **kwargs):
 
     def create_role_binding(self, params: dict) -> RoleBinding:
         def _rollback(vo: RoleBinding):
-            _LOGGER.info(
-                f"[create_role_binding._rollback] "
-                f"Delete trusted service account: {vo.role_binding_id}"
-            )
+            _LOGGER.info(f"[create_role_binding._rollback]: {vo.role_binding_id}")
             vo.delete()
 
         role_binding_vo = self.role_binding_model.create(params)
diff --git a/src/spaceone/identity/model/workspace_group/database.py b/src/spaceone/identity/model/workspace_group/database.py
index 24f0021..ea3d59c 100644
--- a/src/spaceone/identity/model/workspace_group/database.py
+++ b/src/spaceone/identity/model/workspace_group/database.py
@@ -48,6 +48,6 @@ class WorkspaceGroup(MongoModel):
         "change_query_keys": {},
         "ordering": ["name"],
         "indexes": [
-            "workspace_group_id",
+            "name",
         ],
     }
diff --git a/src/spaceone/identity/service/workspace_group_service.py b/src/spaceone/identity/service/workspace_group_service.py
index 0ecb8ac..8a0b5e5 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=False), workspace_group_vo
+            params.dict(exclude_unset=True), workspace_group_vo
         )
 
         workspace_group_info = self.add_user_name_and_state_to_users(