diff --git a/.gradle/8.8/fileHashes/fileHashes.lock b/.gradle/8.8/fileHashes/fileHashes.lock
index a5d7a5e..bd5d00d 100644
Binary files a/.gradle/8.8/fileHashes/fileHashes.lock and b/.gradle/8.8/fileHashes/fileHashes.lock differ
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index a747e8e..f9163b4 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -1,11 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
-        <option name="gradleJvm" value="openjdk-22" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />
diff --git a/.idea/misc.xml b/.idea/misc.xml
index d5aab80..4687115 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -4,5 +4,7 @@
   <component name="FrameworkDetectionExcludesConfiguration">
     <file type="web" url="file://$PROJECT_DIR$" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" project-jdk-name="openjdk-22" project-jdk-type="JavaSDK" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" project-jdk-name="openjdk-22" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
 </project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
deleted file mode 100644
index 8ac3d48..0000000
--- a/.idea/modules.xml
+++ /dev/null
@@ -1,10 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectModuleManager">
-    <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/modules/chapterTwo.iml" filepath="$PROJECT_DIR$/.idea/modules/chapterTwo.iml" />
-      <module fileurl="file://$PROJECT_DIR$/.idea/modules/chapterTwo.main.iml" filepath="$PROJECT_DIR$/.idea/modules/chapterTwo.main.iml" />
-      <module fileurl="file://$PROJECT_DIR$/.idea/modules/chapterTwo.test.iml" filepath="$PROJECT_DIR$/.idea/modules/chapterTwo.test.iml" />
-    </modules>
-  </component>
-</project>
\ No newline at end of file
diff --git a/src/main/kotlin/com/byebye/chapterTwo/domain/member/application/service/UserDetailsServiceImpl.kt b/src/main/kotlin/com/byebye/chapterTwo/domain/member/application/service/UserDetailsServiceImpl.kt
new file mode 100644
index 0000000..8a5f91c
--- /dev/null
+++ b/src/main/kotlin/com/byebye/chapterTwo/domain/member/application/service/UserDetailsServiceImpl.kt
@@ -0,0 +1,29 @@
+package com.byebye.chapterTwo.domain.member.application.service
+
+import com.byebye.chapterTwo.domain.member.adapter.out.mapper.MemberMapper
+import com.byebye.chapterTwo.domain.member.adapter.out.repository.MemberRepository
+import com.byebye.chapterTwo.domain.member.application.exception.MemberErrorCode
+import com.byebye.chapterTwo.global.auth.exception.CustomException
+import com.byebye.chapterTwo.global.auth.jwt.JwtUserDetails
+import org.springframework.data.repository.findByIdOrNull
+import org.springframework.security.core.userdetails.UserDetails
+import org.springframework.security.core.userdetails.UserDetailsService
+import org.springframework.stereotype.Service
+
+@Service
+class UserDetailsServiceImpl(
+    private val memberRepository : MemberRepository,
+    private val memberMapper: MemberMapper
+): UserDetailsService {
+    override fun loadUserByUsername(username: String?): UserDetails {
+        username?: throw CustomException(MemberErrorCode.MEMBER_NOT_FOUND)
+
+        val memberEntity = memberRepository
+            .findByName(username)
+            ?: throw CustomException(MemberErrorCode.MEMBER_NOT_FOUND)
+
+        val member = memberMapper.toDomain(memberEntity)
+
+        return JwtUserDetails(member)
+    }
+}
\ No newline at end of file