diff --git a/packages/velog-server/src/common/plugins/global/authPlugin.ts b/packages/velog-server/src/common/plugins/global/authPlugin.ts
index da76d1f8..8ca590df 100644
--- a/packages/velog-server/src/common/plugins/global/authPlugin.ts
+++ b/packages/velog-server/src/common/plugins/global/authPlugin.ts
@@ -35,13 +35,12 @@ const authPlugin: FastifyPluginAsync = async (fastify) => {
           await userService.restoreToken({ request, reply })
         }
 
-        // const user = await userService.findById(accessTokenData.user_id)
-
-        // if (!user) {
-        //   cookie.clearCookie(reply, 'access_token')
-        //   cookie.clearCookie(reply, 'refresh_token')
-        //   throw new Error('User not found')
-        // }
+        const user = await userService.checkExistsUser(accessTokenData.user_id)
+        if (!user) {
+          cookie.clearCookie(reply, 'access_token')
+          cookie.clearCookie(reply, 'refresh_token')
+          throw new Error('User not found')
+        }
 
         request.user = { id: accessTokenData.user_id }
         return
diff --git a/packages/velog-server/src/graphql/resolvers/postResolvers.ts b/packages/velog-server/src/graphql/resolvers/postResolvers.ts
index e2a391bf..97d9b114 100644
--- a/packages/velog-server/src/graphql/resolvers/postResolvers.ts
+++ b/packages/velog-server/src/graphql/resolvers/postResolvers.ts
@@ -18,8 +18,19 @@ const postResolvers: Resolvers = {
   Post: {
     user: async (parent: PostIncludeUser) => {
       if (!parent.user) {
-        const userService = container.resolve(UserService)
-        return await userService.getCurrentUser(parent.fk_user_id)
+        if (parent?.fk_user_id) {
+          const userService = container.resolve(UserService)
+          return await userService.getCurrentUser(parent.fk_user_id)
+        }
+
+        if (parent.id) {
+          const postService = container.resolve(PostService)
+          const userService = container.resolve(UserService)
+          const post = await postService.findById(parent.id)
+          return await userService.getCurrentUser(post?.fk_user_id)
+        }
+
+        return null
       }
       return parent?.user
     },
diff --git a/packages/velog-server/src/lib/elasticSearch/ElasticSearchService.ts b/packages/velog-server/src/lib/elasticSearch/ElasticSearchService.ts
index 901b0cf4..c3b2a7d3 100644
--- a/packages/velog-server/src/lib/elasticSearch/ElasticSearchService.ts
+++ b/packages/velog-server/src/lib/elasticSearch/ElasticSearchService.ts
@@ -4,6 +4,7 @@ import { injectable, singleton } from 'tsyringe'
 import { BuildQueryService } from './BuildQueryService.js'
 import { PostIncludeTags } from '@services/PostService/PostServiceInterface.js'
 import { Post } from '@prisma/client'
+import { UserService } from '@services/UserService/index.js'
 
 interface Service {
   get client(): Client
@@ -13,7 +14,10 @@ interface Service {
 @injectable()
 @singleton()
 export class ElasticSearchService implements Service {
-  constructor(private readonly buildQueryService: BuildQueryService) {}
+  constructor(
+    private readonly userService: UserService,
+    private readonly buildQueryService: BuildQueryService,
+  ) {}
   public get client(): Client {
     return new Client({ node: ENV.esHost })
   }
@@ -147,14 +151,26 @@ export class ElasticSearchService implements Service {
       },
     })
 
-    const posts = result.body.hits.hits.map((hit: any) => hit._source)
-    posts.forEach((p: any) => {
-      p.released_at = new Date(p.released_at)
+    const sources = result.body.hits.hits
+      .map((hit: any) => hit._source)
+      .map((p: any) => ({ ...p, released_at: new Date(p.released_at) }))
+
+    const promises = sources.map(async (post: any) => {
+      try {
+        const result = await this.userService.checkExistsUser(post?.user?.id)
+        return { id: post.id, result }
+      } catch (error) {
+        console.error('Error checking user:', error)
+        return { id: post.id, result: false }
+      }
     })
 
+    const promiseResult = await Promise.all(promises)
+    const existsUserPosts = promiseResult.filter(({ result }) => result).map(({ id }) => id)
+
     const data = {
       count: result.body.hits.total.value,
-      posts: result.body.hits.hits.map((hit: any) => hit._source),
+      posts: sources.filter((post: any) => existsUserPosts.includes(post.id)),
     }
 
     return data
diff --git a/packages/velog-server/src/lib/redis/RedisService.ts b/packages/velog-server/src/lib/redis/RedisService.ts
index ffd6e1dc..72626fec 100644
--- a/packages/velog-server/src/lib/redis/RedisService.ts
+++ b/packages/velog-server/src/lib/redis/RedisService.ts
@@ -33,6 +33,7 @@ export class RedisService extends Redis implements Service {
         `ssr:/@${username}/series/${seriesUrlSlug}`,
       changeEmail: (code: string) => `changeEmailCode:${code}`,
       trendingWriters: () => `trending:writers`,
+      existsUser: (userId: string) => `exists:user:${userId}`,
     }
   }
 
@@ -61,6 +62,7 @@ type GenerateRedisKey = {
   postSeries: (username: string, seriesUrlSlug: string) => string
   changeEmail: (code: string) => string
   trendingWriters: () => string
+  existsUser: (userId: string) => string
 }
 
 type QueueName = 'createFeed' | 'checkPostSpam'
diff --git a/packages/velog-server/src/services/UserService/index.ts b/packages/velog-server/src/services/UserService/index.ts
index a036c413..6bd1fa4b 100644
--- a/packages/velog-server/src/services/UserService/index.ts
+++ b/packages/velog-server/src/services/UserService/index.ts
@@ -41,6 +41,7 @@ interface Service {
   initiateChangeEmail(email: string, signedUserId?: string): Promise<void>
   confirmChangeEmail(code: string, signedUserId?: string): Promise<void>
   checkTrust(userId: string): Promise<boolean>
+  checkExistsUser(userId: string): Promise<boolean>
 }
 
 @injectable()
@@ -316,6 +317,19 @@ export class UserService implements Service {
     const diffDays = differenceInDays(today, joinDay)
     return diffDays > 20
   }
+  public async checkExistsUser(userId?: string): Promise<boolean> {
+    if (!userId) return false
+
+    const key = this.redis.generateKey.existsUser(userId)
+    const value = await this.redis.get(key)
+    if (value === 'true') return true
+    if (value === 'false') return false
+
+    const user = await this.findById(userId)
+    const save = user ? 'true' : 'false'
+    await this.redis.set(key, save, 'EX', Time.ONE_MINUTE_IN_S * 10)
+    return !!user
+  }
 }
 
 type FindByIdOrUsernameArgs = {