diff --git a/src/external/dto/res/externalInfoRes.dto.ts b/src/external/dto/res/externalInfoRes.dto.ts
index db37cec..f8b6bd2 100644
--- a/src/external/dto/res/externalInfoRes.dto.ts
+++ b/src/external/dto/res/externalInfoRes.dto.ts
@@ -1,6 +1,6 @@
 import { ApiProperty } from '@nestjs/swagger';
 import { Authority, Role, RoleExternalAuthority } from '@prisma/client';
-import { Exclude } from 'class-transformer';
+import { Exclude, Expose } from 'class-transformer';
 import { GroupWithRole } from 'src/group/types/groupWithRole';
 
 class RoleExternalAuthorityResDto implements RoleExternalAuthority {
@@ -32,11 +32,23 @@ class RoleResDto implements Role {
   })
   authorities: Authority[];
 
-  @ApiProperty({ type: RoleExternalAuthorityResDto, isArray: true })
+  @ApiProperty()
+  @Expose()
+  get externalAuthority(): string[] {
+    return this.RoleExternalAuthority.map(
+      (roleExternalAuthority) => roleExternalAuthority.authority,
+    );
+  }
+
+  @Exclude()
   RoleExternalAuthority: RoleExternalAuthorityResDto[];
+
+  constructor(partial: Partial<Role>) {
+    Object.assign(this, partial);
+  }
 }
 
-class GroupWithRoleResDto implements GroupWithRole {
+export class GroupWithRoleResDto implements GroupWithRole {
   @ApiProperty()
   uuid: string;
 
@@ -66,6 +78,10 @@ class GroupWithRoleResDto implements GroupWithRole {
 
   @Exclude()
   deletedAt: Date | null;
+
+  constructor(partial: Partial<GroupWithRole>) {
+    Object.assign(this, partial);
+  }
 }
 
 export class ExternalInfoResDto {
diff --git a/src/external/external.service.ts b/src/external/external.service.ts
index 6d5f3e1..76f3d0d 100644
--- a/src/external/external.service.ts
+++ b/src/external/external.service.ts
@@ -6,7 +6,10 @@ import { UserService } from 'src/user/user.service';
 import { GroupService } from 'src/group/group.service';
 import { ExternalTokenResDto } from './dto/res/externalTokenRes.dto';
 import { ExternalPayload } from './types/certPayload';
-import { ExternalInfoResDto } from './dto/res/externalInfoRes.dto';
+import {
+  ExternalInfoResDto,
+  GroupWithRoleResDto,
+} from './dto/res/externalInfoRes.dto';
 
 @Injectable()
 export class ExternalService {
@@ -35,6 +38,10 @@ export class ExternalService {
   }
 
   async getExternalInfo(payload: ExternalPayload): Promise<ExternalInfoResDto> {
-    return this.groupService.getGroupListWithRole(payload.sub, payload.aud);
+    return {
+      list: (
+        await this.groupService.getGroupListWithRole(payload.sub, payload.aud)
+      ).map((groupWithRole) => new GroupWithRoleResDto(groupWithRole)),
+    };
   }
 }
diff --git a/src/group/group.service.ts b/src/group/group.service.ts
index 4ce74a9..a05a8e7 100644
--- a/src/group/group.service.ts
+++ b/src/group/group.service.ts
@@ -221,15 +221,8 @@ export class GroupService {
   async getGroupListWithRole(
     userUuid: string,
     clientUuid: string,
-  ): Promise<{
-    list: GroupWithRole[];
-  }> {
+  ): Promise<GroupWithRole[]> {
     this.logger.log(`getGroupListWithRole`);
-    return {
-      list: await this.groupRepository.getGroupListWithRole(
-        userUuid,
-        clientUuid,
-      ),
-    };
+    return this.groupRepository.getGroupListWithRole(userUuid, clientUuid);
   }
 }