diff --git a/src/spaceone/identity/manager/role_binding_manager.py b/src/spaceone/identity/manager/role_binding_manager.py
index 7d0073ea..7d5a5ad5 100644
--- a/src/spaceone/identity/manager/role_binding_manager.py
+++ b/src/spaceone/identity/manager/role_binding_manager.py
@@ -5,12 +5,12 @@
 from spaceone.core.manager import BaseManager
 
 from spaceone.identity.model.role_binding.database import RoleBinding
+from spaceone.identity.manager.user_group_manager import UserGroupManager
 
 _LOGGER = logging.getLogger(__name__)
 
 
 class RoleBindingManager(BaseManager):
-
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
         self.role_binding_model = RoleBinding
@@ -46,6 +46,19 @@ def delete_role_binding_by_vo(role_binding_vo: RoleBinding) -> None:
         )
         role_binding_vo.delete()
 
+        if role_binding_vo.workspace_id:
+            # Delete user from user groups
+            user_group_mgr = UserGroupManager()
+            user_group_vos = user_group_mgr.filter_user_groups(
+                users=role_binding_vo.user_id, domain_id=role_binding_vo.domain_id
+            )
+            for user_group_vo in user_group_vos:
+                users = user_group_vo.users
+                users.remove(role_binding_vo.user_id)
+                user_group_mgr.update_user_group_by_vo(
+                    {"users": users}, user_group_vo=user_group_vo
+                )
+
     def get_role_binding(
         self, role_binding_id: str, domain_id: str, workspace_id: str = None
     ) -> RoleBinding:
diff --git a/src/spaceone/identity/service/role_binding_service.py b/src/spaceone/identity/service/role_binding_service.py
index 778971c6..1f4282b4 100644
--- a/src/spaceone/identity/service/role_binding_service.py
+++ b/src/spaceone/identity/service/role_binding_service.py
@@ -10,8 +10,6 @@
 from spaceone.identity.manager.role_manager import RoleManager
 from spaceone.identity.manager.user_manager import UserManager
 from spaceone.identity.manager.workspace_manager import WorkspaceManager
-from spaceone.identity.manager.user_group_manager import UserGroupManager
-from spaceone.identity.model import RoleBinding
 from spaceone.identity.model.role_binding.request import *
 from spaceone.identity.model.role_binding.response import *
 
@@ -263,7 +261,11 @@ def delete(self, params: RoleBindingDeleteRequest) -> None:
         user_vo = self.user_mgr.get_user(rb_vo.user_id, rb_vo.domain_id)
 
         self.user_mgr.update_user_by_vo(user_role_info, user_vo)
-        self.delete_role_binding_by_vo(rb_vo)
+
+        if rb_vo.workspace_id:
+            self.update_workspace_user_count(rb_vo.domain_id, rb_vo.workspace_id)
+
+        self.role_binding_manager.delete_role_binding_by_vo(rb_vo)
 
     @transaction(
         permission="identity:RoleBinding.read",
@@ -461,25 +463,6 @@ def update_workspace_user_count(self, domain_id: str, workspace_id: str) -> None
                 {"user_count": user_rb_total_count}, workspace_vo
             )
 
-    def delete_role_binding_by_vo(self, rb_vo: RoleBinding) -> None:
-        self.role_binding_manager.delete_role_binding_by_vo(rb_vo)
-
-        if rb_vo.workspace_id:
-            # Delete user from user groups
-            user_group_mgr = UserGroupManager()
-            user_group_vos = user_group_mgr.filter_user_groups(
-                users=rb_vo.user_id, domain_id=rb_vo.domain_id
-            )
-            for user_group_vo in user_group_vos:
-                users = user_group_vo.users
-                users.remove(rb_vo.user_id)
-                user_group_mgr.update_user_group_by_vo(
-                    {"users": users}, user_group_vo=user_group_vo
-                )
-
-            # Update workspace user count
-            self.update_workspace_user_count(rb_vo.domain_id, rb_vo.workspace_id)
-
     def _get_workspace_user_count(self, domain_id: str, workspace_id: str) -> int:
         user_rb_ids = self.role_binding_manager.stat_role_bindings(
             query={