diff --git a/spring-security/src/main/java/com/spring/security1/config/SecurityConfig.java b/spring-security/src/main/java/com/spring/security1/config/SecurityConfig.java
index 5fba44af..bbfb4a22 100644
--- a/spring-security/src/main/java/com/spring/security1/config/SecurityConfig.java
+++ b/spring-security/src/main/java/com/spring/security1/config/SecurityConfig.java
@@ -21,13 +21,15 @@ public class SecurityConfig extends WebSecurityConfigurerAdapter {
     protected void configure(HttpSecurity http) throws Exception {
         http.csrf().disable();
         http.authorizeRequests()
-                .antMatchers("/user/**").authenticated()
+                .antMatchers("/user/**").authenticated() // 인증만 되면 들어갈 수 있다.
                 .antMatchers("/manager/**").access("hasRole('ROLE_ADMIN') or hasRole('ROLE_MANAGER')")
                 .antMatchers("/admin/**").access("hasRole('ROLE_ADMIN')")
                 .anyRequest().permitAll()
                 .and()
                 .formLogin()
-                .loginPage("/loginForm");
+                .loginPage("/loginForm")
+                .loginProcessingUrl("/login") //  /login 주소가 호출이 되면 시큐리티가 대신 로그인을 진행해 준다.
+                .defaultSuccessUrl("/");
     }
 
 }
diff --git a/spring-security/src/main/java/com/spring/security1/config/auth/PrincipalDetails.java b/spring-security/src/main/java/com/spring/security1/config/auth/PrincipalDetails.java
new file mode 100644
index 00000000..fdb760d4
--- /dev/null
+++ b/spring-security/src/main/java/com/spring/security1/config/auth/PrincipalDetails.java
@@ -0,0 +1,71 @@
+package com.spring.security1.config.auth;
+
+// 시큐리티가 /login 주소 요청이 오면 대신 로그인을 진행시킨다.
+// 로그인이 완료가 되면 시큐리티 session을 만들어 준다. (Security ContextHolder)
+// 오브젝트 타입 => Authentication 타입 객체
+// Authentication 안에 User 정보가 있어야 한다.
+// User오브젝트 타입 => UserDetails 타입 객체
+
+// Security Session => Authentication => UserDetails
+
+import com.spring.security1.model.User;
+import org.springframework.security.core.GrantedAuthority;
+import org.springframework.security.core.userdetails.UserDetails;
+
+import java.util.ArrayList;
+import java.util.Collection;
+
+public class PrincipalDetails implements UserDetails {
+
+    private User user;
+
+    public PrincipalDetails(User user) {
+        this.user = user;
+    }
+
+    // 해당 User의 권한을 리턴하는 곳
+    @Override
+    public Collection<? extends GrantedAuthority> getAuthorities() {
+        Collection<GrantedAuthority> collection = new ArrayList<>();
+        collection.add(new GrantedAuthority() {
+            @Override
+            public String getAuthority() {
+                return user.getRole();
+            }
+        });
+        return collection;
+    }
+
+    @Override
+    public String getPassword() {
+        return user.getPassword();
+    }
+
+    @Override
+    public String getUsername() {
+        return user.getUsername();
+    }
+
+    @Override
+    public boolean isAccountNonExpired() {
+        return true;
+    }
+
+    @Override
+    public boolean isAccountNonLocked() {
+        return true;
+    }
+
+    @Override
+    public boolean isCredentialsNonExpired() {
+        return true;
+    }
+
+    @Override
+    public boolean isEnabled() {
+
+        // ex) 1년동안 회원이 로그인을 안하면 휴면계정으로 하기로 했다면?
+        // 현재시간 - 로그인 시간 => 1년을 초과하면 false 리턴
+        return true;
+    }
+}
diff --git a/spring-security/src/main/java/com/spring/security1/config/auth/PrincipalDetailsService.java b/spring-security/src/main/java/com/spring/security1/config/auth/PrincipalDetailsService.java
new file mode 100644
index 00000000..f08ddba9
--- /dev/null
+++ b/spring-security/src/main/java/com/spring/security1/config/auth/PrincipalDetailsService.java
@@ -0,0 +1,30 @@
+package com.spring.security1.config.auth;
+
+import com.spring.security1.model.User;
+import com.spring.security1.repository.UserRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+import org.springframework.stereotype.Service;
+
+// 시큐리티 설정에서 loginProcessingUrl("/login);
+// /login 요청이 들어오면 자동으로 UserDetailsService 타입으로 IoC되어 있는
+// loadUserByUsername 함수가 실행 된다.
+@Service
+@RequiredArgsConstructor
+public class PrincipalDetailsService implements UserDetailsService {
+
+    private final UserRepository userRepository;
+
+
+    @Override
+    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
+        User userEntity = userRepository.findByUsername(username);
+        System.out.println(username);
+        if(userEntity != null) {
+            return new PrincipalDetails(userEntity); // 시큐리티 session 내부에 Authentication 내부에 UserDetail 이 들어간다.
+        }
+        return null;
+    }
+}
diff --git a/spring-security/src/main/java/com/spring/security1/repository/UserRepository.java b/spring-security/src/main/java/com/spring/security1/repository/UserRepository.java
index f81928f2..f1c1f882 100644
--- a/spring-security/src/main/java/com/spring/security1/repository/UserRepository.java
+++ b/spring-security/src/main/java/com/spring/security1/repository/UserRepository.java
@@ -8,4 +8,7 @@ import org.springframework.stereotype.Repository;
 // JpaRepository를 상속 했기 때문에 @Repository 어노테이션이 없어도 IoC된다.
 @Repository
 public interface UserRepository extends JpaRepository<User, Integer> {
+    // findBy규칙 ->Username 문법
+    // select * from user where username='?';
+    User findByUsername(String username);
 }
diff --git a/spring-security/src/main/resources/application.yml b/spring-security/src/main/resources/application.yml
index 3aa441f1..574d6baa 100644
--- a/spring-security/src/main/resources/application.yml
+++ b/spring-security/src/main/resources/application.yml
@@ -16,7 +16,7 @@ spring:
 
   jpa:
     hibernate:
-      ddl-auto: create #create update none
+      ddl-auto: update #create update none
       naming:
         physical-strategy: org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl
     show-sql: true
\ No newline at end of file
diff --git a/spring-security/src/main/resources/templates/loginForm.html b/spring-security/src/main/resources/templates/loginForm.html
index 5af3ae35..a013732f 100644
--- a/spring-security/src/main/resources/templates/loginForm.html
+++ b/spring-security/src/main/resources/templates/loginForm.html
@@ -7,7 +7,7 @@
 <body>
     <h1>로그인 페이지</h1>
     <hr/>
-    <form>
+    <form action="/login" method="post">
         <input type="text" name="username" placeholder="Username"/> <br/>
         <input type="password" name="password" placeholder="Password"/> <br/>
         <button>로그인</button>