diff --git a/build.gradle b/build.gradle
index 4943187..88a261e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -19,6 +19,8 @@ repositories {
 }
 
 dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter-aop'
+	implementation 'org.springframework.boot:spring-boot-starter-validation'
 	implementation group: 'com.auth0', name: 'java-jwt', version: '4.3.0'
 	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
 	implementation 'org.springframework.boot:spring-boot-starter-web'
@@ -27,6 +29,7 @@ dependencies {
 	runtimeOnly 'com.h2database:h2'
 	annotationProcessor 'org.projectlombok:lombok'
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+
 }
 
 tasks.named('test') {
diff --git a/src/main/java/shop/mtcoding/metamall/MetamallApplication.java b/src/main/java/shop/mtcoding/metamall/MetamallApplication.java
index 487bb62..a7b8444 100644
--- a/src/main/java/shop/mtcoding/metamall/MetamallApplication.java
+++ b/src/main/java/shop/mtcoding/metamall/MetamallApplication.java
@@ -4,24 +4,24 @@
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.context.annotation.Bean;
-import shop.mtcoding.metamall.model.orderproduct.OrderProduct;
-import shop.mtcoding.metamall.model.orderproduct.OrderProductRepository;
-import shop.mtcoding.metamall.model.ordersheet.OrderSheet;
-import shop.mtcoding.metamall.model.ordersheet.OrderSheetRepository;
+import shop.mtcoding.metamall.model.order.product.OrderProductRepository;
+import shop.mtcoding.metamall.model.order.sheet.OrderSheetRepository;
 import shop.mtcoding.metamall.model.product.ProductRepository;
 import shop.mtcoding.metamall.model.user.User;
 import shop.mtcoding.metamall.model.user.UserRepository;
 
+import java.util.Arrays;
+
 @SpringBootApplication
 public class MetamallApplication {
 
 	@Bean
 	CommandLineRunner initData(UserRepository userRepository, ProductRepository productRepository, OrderProductRepository orderProductRepository, OrderSheetRepository orderSheetRepository){
 		return (args)->{
-			// 여기에서 save 하면 됨.
-			// bulk Collector는 saveAll 하면 됨.
-			User ssar = User.builder().username("ssar").password("1234").email("ssar@nate.com").role("USER").build();
-			userRepository.save(ssar);
+			User ssar = User.builder().username("ssar").password("1234").email("ssar@nate.com").role("USER").status(true).build();
+			User seller = User.builder().username("seller").password("1234").email("ssar@nate.com").role("SELLER").status(true).build();
+			User admin = User.builder().username("admin").password("1234").email("ssar@nate.com").role("ADMIN").status(true).build();
+			userRepository.saveAll(Arrays.asList(ssar,seller,admin));
 		};
 	}
 
diff --git a/src/main/java/shop/mtcoding/metamall/config/MyWebMvcConfig.java b/src/main/java/shop/mtcoding/metamall/config/MyWebMvcConfig.java
new file mode 100644
index 0000000..ca60977
--- /dev/null
+++ b/src/main/java/shop/mtcoding/metamall/config/MyWebMvcConfig.java
@@ -0,0 +1,49 @@
+package shop.mtcoding.metamall.config;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.method.support.HandlerMethodArgumentResolver;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+import shop.mtcoding.metamall.core.interceptor.MyAdminInterceptor;
+import shop.mtcoding.metamall.core.interceptor.MySellerInterceptor;
+import shop.mtcoding.metamall.core.resolver.MySessionArgumentResolver;
+
+import java.util.List;
+
+@RequiredArgsConstructor
+@Configuration
+public class WebMvcConfig implements WebMvcConfigurer {
+
+    private final MyAdminInterceptor adminInterceptor;
+    private final MySellerInterceptor sellerInterceptor;
+    private final MySessionArgumentResolver mySessionArgumentResolver;
+
+    @Override
+    public void addCorsMappings(CorsRegistry registry) {
+        registry.addMapping("/**")
+            .allowedHeaders("*")
+            .allowedMethods("*") // GET, POST, PUT, DELETE (Javascript 요청 허용)
+            .allowedOriginPatterns("*") // 모든 IP 주소 허용 (프론트 앤드 IP만 허용하게 변경해야함. * 안됨)
+            .allowCredentials(true)
+            .exposedHeaders("Authorization"); // 옛날에는 디폴트로 브라우저에 노출되어 있었는데 지금은 아님
+    }
+
+
+    // AOP는 매개변수 값 확인해서 권한 비교해야할 때 사용
+    // Interceptor는 세션 권한으로 체크할 때 사용
+    @Override
+    public void addInterceptors(InterceptorRegistry registry) {
+        registry.addInterceptor(adminInterceptor)
+            .addPathPatterns("/admin/**");
+
+        registry.addInterceptor(sellerInterceptor)
+            .addPathPatterns("/seller/**");
+    }
+
+    @Override
+    public void addArgumentResolvers(List<HandlerMethodArgumentResolver> resolvers) {
+        resolvers.add(mySessionArgumentResolver);
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/shop/mtcoding/metamall/config/WebMvcConfig.java b/src/main/java/shop/mtcoding/metamall/config/WebMvcConfig.java
deleted file mode 100644
index 64f5d9b..0000000
--- a/src/main/java/shop/mtcoding/metamall/config/WebMvcConfig.java
+++ /dev/null
@@ -1,18 +0,0 @@
-package shop.mtcoding.metamall.config;
-
-import org.springframework.context.annotation.Configuration;
-import org.springframework.web.servlet.config.annotation.CorsRegistry;
-import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
-
-@Configuration
-public class WebMvcConfig implements WebMvcConfigurer {
-    @Override
-    public void addCorsMappings(CorsRegistry registry) {
-        registry.addMapping("/**")
-                .allowedHeaders("*")
-                .allowedMethods("*") // GET, POST, PUT, DELETE (Javascript 요청 허용)
-                .allowedOriginPatterns("*") // 모든 IP 주소 허용 (프론트 앤드 IP만 허용하게 변경해야함. * 안됨)
-                .allowCredentials(true)
-                .exposedHeaders("Authorization"); // 옛날에는 디폴트로 브라우저에 노출되어 있었는데 지금은 아님
-    }
-}
diff --git a/src/main/java/shop/mtcoding/metamall/core/advice/MyErrorLogAdvice.java b/src/main/java/shop/mtcoding/metamall/core/advice/MyErrorLogAdvice.java
new file mode 100644
index 0000000..8fa7b67
--- /dev/null
+++ b/src/main/java/shop/mtcoding/metamall/core/advice/MyErrorLogAdvice.java
@@ -0,0 +1,2 @@
+package shop.mtcoding.metamall.core.advice;public class MyErrorLogAdvice {
+}
diff --git a/src/main/java/shop/mtcoding/metamall/core/advice/MySameUserIdAdvice.java b/src/main/java/shop/mtcoding/metamall/core/advice/MySameUserIdAdvice.java
new file mode 100644
index 0000000..16c73bf
--- /dev/null
+++ b/src/main/java/shop/mtcoding/metamall/core/advice/MySameUserIdAdvice.java
@@ -0,0 +1,2 @@
+package shop.mtcoding.metamall.core.advice;public class MySameUserIdAdvice {
+}
diff --git a/src/main/java/shop/mtcoding/metamall/core/advice/MyValidAdvice.java b/src/main/java/shop/mtcoding/metamall/core/advice/MyValidAdvice.java
new file mode 100644
index 0000000..fddc42f
--- /dev/null
+++ b/src/main/java/shop/mtcoding/metamall/core/advice/MyValidAdvice.java
@@ -0,0 +1,2 @@
+package shop.mtcoding.metamall.core.advice;public class MyValidAdvice {
+}
diff --git a/src/main/java/shop/mtcoding/metamall/core/annotation/MyErrorLogRecord.java b/src/main/java/shop/mtcoding/metamall/core/annotation/MyErrorLogRecord.java
new file mode 100644
index 0000000..d9b19fc
--- /dev/null
+++ b/src/main/java/shop/mtcoding/metamall/core/annotation/MyErrorLogRecord.java
@@ -0,0 +1,2 @@
+package shop.mtcoding.metamall.core.annotation;public class MyErrorLogRecord {
+}
diff --git a/src/main/java/shop/mtcoding/metamall/core/annotation/MySameUserIdCheck.java b/src/main/java/shop/mtcoding/metamall/core/annotation/MySameUserIdCheck.java
new file mode 100644
index 0000000..53785f0
--- /dev/null
+++ b/src/main/java/shop/mtcoding/metamall/core/annotation/MySameUserIdCheck.java
@@ -0,0 +1,2 @@
+package shop.mtcoding.metamall.core.annotation;public @interface MySameUserIdCheck {
+}
diff --git a/src/main/java/shop/mtcoding/metamall/core/annotation/MySessionStore.java b/src/main/java/shop/mtcoding/metamall/core/annotation/MySessionStore.java
new file mode 100644
index 0000000..14f0253
--- /dev/null
+++ b/src/main/java/shop/mtcoding/metamall/core/annotation/MySessionStore.java
@@ -0,0 +1,2 @@
+package shop.mtcoding.metamall.core.annotation;public @interface MySessionStore {
+}
diff --git a/src/main/java/shop/mtcoding/metamall/core/exception/Exception404.java b/src/main/java/shop/mtcoding/metamall/core/exception/Exception404.java
deleted file mode 100644
index c20b64f..0000000
--- a/src/main/java/shop/mtcoding/metamall/core/exception/Exception404.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package shop.mtcoding.metamall.core.exception;
-
-import lombok.Getter;
-import org.springframework.http.HttpStatus;
-import shop.mtcoding.metamall.dto.ResponseDto;
-
-
-// 리소스 없음
-@Getter
-public class Exception404 extends RuntimeException {
-    public Exception404(String message) {
-        super(message);
-    }
-
-    public ResponseDto<?> body(){
-        ResponseDto<String> responseDto = new ResponseDto<>();
-        responseDto.fail(HttpStatus.NOT_FOUND, "notFound", getMessage());
-        return responseDto;
-    }
-
-    public HttpStatus status(){
-        return HttpStatus.NOT_FOUND;
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/shop/mtcoding/metamall/core/exception/Exception500.java b/src/main/java/shop/mtcoding/metamall/core/exception/Exception500.java
deleted file mode 100644
index d3d4468..0000000
--- a/src/main/java/shop/mtcoding/metamall/core/exception/Exception500.java
+++ /dev/null
@@ -1,24 +0,0 @@
-package shop.mtcoding.metamall.core.exception;
-
-import lombok.Getter;
-import org.springframework.http.HttpStatus;
-import shop.mtcoding.metamall.dto.ResponseDto;
-
-
-// 서버 에러
-@Getter
-public class Exception500 extends RuntimeException {
-    public Exception500(String message) {
-        super(message);
-    }
-
-    public ResponseDto<?> body(){
-        ResponseDto<String> responseDto = new ResponseDto<>();
-        responseDto.fail(HttpStatus.INTERNAL_SERVER_ERROR, "serverError", getMessage());
-        return responseDto;
-    }
-
-    public HttpStatus status(){
-        return HttpStatus.INTERNAL_SERVER_ERROR;
-    }
-}
\ No newline at end of file
diff --git a/src/main/java/shop/mtcoding/metamall/core/interceptor/MyAdminInterceptor.java b/src/main/java/shop/mtcoding/metamall/core/interceptor/MyAdminInterceptor.java
new file mode 100644
index 0000000..142bb47
--- /dev/null
+++ b/src/main/java/shop/mtcoding/metamall/core/interceptor/MyAdminInterceptor.java
@@ -0,0 +1,2 @@
+package shop.mtcoding.metamall.core.interceptor;public class MyAdminInterceptor {
+}
diff --git a/src/main/java/shop/mtcoding/metamall/core/interceptor/MySellerInterceptor.java b/src/main/java/shop/mtcoding/metamall/core/interceptor/MySellerInterceptor.java
new file mode 100644
index 0000000..1ebbe82
--- /dev/null
+++ b/src/main/java/shop/mtcoding/metamall/core/interceptor/MySellerInterceptor.java
@@ -0,0 +1,2 @@
+package shop.mtcoding.metamall.core.interceptor;public class MySellerInterceptor {
+}
diff --git a/src/main/java/shop/mtcoding/metamall/core/resolver/MySessionArgumentResolver.java b/src/main/java/shop/mtcoding/metamall/core/resolver/MySessionArgumentResolver.java
new file mode 100644
index 0000000..885e07a
--- /dev/null
+++ b/src/main/java/shop/mtcoding/metamall/core/resolver/MySessionArgumentResolver.java
@@ -0,0 +1,2 @@
+package shop.mtcoding.metamall.core.resolver;public class MySessionArgumentResolver {
+}
diff --git a/src/main/java/shop/mtcoding/metamall/core/session/LoginUser.java b/src/main/java/shop/mtcoding/metamall/core/session/SessionUser.java
similarity index 100%
rename from src/main/java/shop/mtcoding/metamall/core/session/LoginUser.java
rename to src/main/java/shop/mtcoding/metamall/core/session/SessionUser.java
diff --git a/src/main/java/shop/mtcoding/metamall/util/MyDateUtil.java b/src/main/java/shop/mtcoding/metamall/core/util/MyDateUtil.java
similarity index 100%
rename from src/main/java/shop/mtcoding/metamall/util/MyDateUtil.java
rename to src/main/java/shop/mtcoding/metamall/core/util/MyDateUtil.java
diff --git a/src/main/java/shop/mtcoding/metamall/core/util/MyFilterResponseUtil.java b/src/main/java/shop/mtcoding/metamall/core/util/MyFilterResponseUtil.java
new file mode 100644
index 0000000..e2c345a
--- /dev/null
+++ b/src/main/java/shop/mtcoding/metamall/core/util/MyFilterResponseUtil.java
@@ -0,0 +1,2 @@
+package shop.mtcoding.metamall.core.util;public class MyFilterResponseUtil {
+}
diff --git a/src/main/java/shop/mtcoding/metamall/dto/ResponseDto.java b/src/main/java/shop/mtcoding/metamall/dto/ResponseDTO.java
similarity index 100%
rename from src/main/java/shop/mtcoding/metamall/dto/ResponseDto.java
rename to src/main/java/shop/mtcoding/metamall/dto/ResponseDTO.java
diff --git a/src/main/java/shop/mtcoding/metamall/dto/user/ValidDTO.java b/src/main/java/shop/mtcoding/metamall/dto/user/ValidDTO.java
new file mode 100644
index 0000000..8a7713f
--- /dev/null
+++ b/src/main/java/shop/mtcoding/metamall/dto/user/ValidDTO.java
@@ -0,0 +1,2 @@
+package shop.mtcoding.metamall.dto.user;public class ValidDTO {
+}
diff --git a/src/main/java/shop/mtcoding/metamall/model/log/error/ErrorLog.java b/src/main/java/shop/mtcoding/metamall/model/log/error/ErrorLog.java
index fbfe7e5..41dad1d 100644
--- a/src/main/java/shop/mtcoding/metamall/model/log/error/ErrorLog.java
+++ b/src/main/java/shop/mtcoding/metamall/model/log/error/ErrorLog.java
@@ -17,6 +17,7 @@ public class ErrorLog {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
+    @Column(nullable = false, length = 100000)
     private String msg;
     private Long userId;
 
diff --git a/src/main/java/shop/mtcoding/metamall/model/orderproduct/OrderProduct.java b/src/main/java/shop/mtcoding/metamall/model/order/product/OrderProduct.java
similarity index 78%
rename from src/main/java/shop/mtcoding/metamall/model/orderproduct/OrderProduct.java
rename to src/main/java/shop/mtcoding/metamall/model/order/product/OrderProduct.java
index 165905e..a369e37 100644
--- a/src/main/java/shop/mtcoding/metamall/model/orderproduct/OrderProduct.java
+++ b/src/main/java/shop/mtcoding/metamall/model/order/product/OrderProduct.java
@@ -1,10 +1,10 @@
-package shop.mtcoding.metamall.model.orderproduct;
+package shop.mtcoding.metamall.model.order.product;
 
 import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
-import shop.mtcoding.metamall.model.ordersheet.OrderSheet;
+import shop.mtcoding.metamall.model.order.sheet.OrderSheet;
 import shop.mtcoding.metamall.model.product.Product;
 
 import javax.persistence.*;
@@ -19,9 +19,13 @@ public class OrderProduct { // 주문 상품
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
+
+    //chekcpoint -> 무한 참조
     @ManyToOne
     private Product product;
+    @Column(nullable = false)
     private Integer count; // 상품 주문 개수
+    @Column(nullable = false)
     private Integer orderPrice; // 상품 주문 금액
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
@@ -29,6 +33,14 @@ public class OrderProduct { // 주문 상품
     @ManyToOne
     private OrderSheet orderSheet;
 
+
+     //checkpoint-> 편의 메서드 만드는 이유
+    public void syncOrderSheet(OrderSheet orderSheet){
+        this.orderSheet=orderSheet;
+
+    }
+
+
     @PrePersist
     protected void onCreate() {
         this.createdAt = LocalDateTime.now();
diff --git a/src/main/java/shop/mtcoding/metamall/model/orderproduct/OrderProductRepository.java b/src/main/java/shop/mtcoding/metamall/model/order/product/OrderProductRepository.java
similarity index 74%
rename from src/main/java/shop/mtcoding/metamall/model/orderproduct/OrderProductRepository.java
rename to src/main/java/shop/mtcoding/metamall/model/order/product/OrderProductRepository.java
index 6f1238c..1b686dc 100644
--- a/src/main/java/shop/mtcoding/metamall/model/orderproduct/OrderProductRepository.java
+++ b/src/main/java/shop/mtcoding/metamall/model/order/product/OrderProductRepository.java
@@ -1,4 +1,4 @@
-package shop.mtcoding.metamall.model.orderproduct;
+package shop.mtcoding.metamall.model.order.product;
 
 import org.springframework.data.jpa.repository.JpaRepository;
 
diff --git a/src/main/java/shop/mtcoding/metamall/model/ordersheet/OrderSheet.java b/src/main/java/shop/mtcoding/metamall/model/order/sheet/OrderSheet.java
similarity index 69%
rename from src/main/java/shop/mtcoding/metamall/model/ordersheet/OrderSheet.java
rename to src/main/java/shop/mtcoding/metamall/model/order/sheet/OrderSheet.java
index 7638710..febf261 100644
--- a/src/main/java/shop/mtcoding/metamall/model/ordersheet/OrderSheet.java
+++ b/src/main/java/shop/mtcoding/metamall/model/order/sheet/OrderSheet.java
@@ -1,11 +1,10 @@
-package shop.mtcoding.metamall.model.ordersheet;
+package shop.mtcoding.metamall.model.order.sheet;
 
 import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
-import shop.mtcoding.metamall.model.orderproduct.OrderProduct;
-import shop.mtcoding.metamall.model.product.Product;
+import shop.mtcoding.metamall.model.order.product.OrderProduct;
 import shop.mtcoding.metamall.model.user.User;
 
 import javax.persistence.*;
@@ -24,12 +23,26 @@ public class OrderSheet { // 주문서
     private Long id;
     @ManyToOne
     private User user; // 주문자
-    @OneToMany(mappedBy = "orderSheet")
+
+    //checkpoint -> 무한참조
+    @OneToMany(mappedBy = "orderSheet", cascade = CascadeType.ALL, orphanRemoval = true)
     private List<OrderProduct> orderProductList = new ArrayList<>(); // 총 주문 상품 리스트
+
+    @Column(nullable = false)
     private Integer totalPrice; // 총 주문 금액 (총 주문 상품 리스트의 orderPrice 합)
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
 
+    public void addOrderProduct(OrderProduct orderProduct){
+        orderProductList.add(orderProduct);
+        orderProduct.syncOrderSheet(this);
+    }
+    public void removeOrderProduct(OrderProduct orderProduct){
+        orderProductList.remove(orderProduct);
+        orderProduct.syncOrderSheet(null);
+    }
+
+
     @PrePersist
     protected void onCreate() {
         this.createdAt = LocalDateTime.now();
@@ -42,6 +55,14 @@ protected void onUpdate() {
     
     // 연관관계 메서드 구현 필요
 
+
+
+
+
+
+
+
+
     @Builder
     public OrderSheet(Long id, User user, Integer totalPrice, LocalDateTime createdAt, LocalDateTime updatedAt) {
         this.id = id;
diff --git a/src/main/java/shop/mtcoding/metamall/model/order/sheet/OrderSheetRepository.java b/src/main/java/shop/mtcoding/metamall/model/order/sheet/OrderSheetRepository.java
new file mode 100644
index 0000000..853dfa2
--- /dev/null
+++ b/src/main/java/shop/mtcoding/metamall/model/order/sheet/OrderSheetRepository.java
@@ -0,0 +1,15 @@
+package shop.mtcoding.metamall.model.order.sheet;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.Query;
+import org.springframework.data.repository.query.Param;
+
+import java.util.List;
+
+public interface OrderSheetRepository extends JpaRepository<OrderSheet, Long> {
+
+  //내가 주문한 목록보기
+  @Query("select os from OrderSheet os where os.user.id= :userId")
+  List<OrderSheet> findByUserId(@Param("userId") Long userId);
+
+}
diff --git a/src/main/java/shop/mtcoding/metamall/model/ordersheet/OrderSheetRepository.java b/src/main/java/shop/mtcoding/metamall/model/ordersheet/OrderSheetRepository.java
deleted file mode 100644
index 5d59249..0000000
--- a/src/main/java/shop/mtcoding/metamall/model/ordersheet/OrderSheetRepository.java
+++ /dev/null
@@ -1,6 +0,0 @@
-package shop.mtcoding.metamall.model.ordersheet;
-
-import org.springframework.data.jpa.repository.JpaRepository;
-
-public interface OrderSheetRepository extends JpaRepository<OrderSheet, Long> {
-}
diff --git a/src/main/java/shop/mtcoding/metamall/model/product/Product.java b/src/main/java/shop/mtcoding/metamall/model/product/Product.java
index bc8c618..013db95 100644
--- a/src/main/java/shop/mtcoding/metamall/model/product/Product.java
+++ b/src/main/java/shop/mtcoding/metamall/model/product/Product.java
@@ -4,6 +4,7 @@
 import lombok.Getter;
 import lombok.NoArgsConstructor;
 import lombok.Setter;
+import shop.mtcoding.metamall.model.user.User;
 
 import javax.persistence.*;
 import java.time.LocalDateTime;
@@ -17,12 +18,41 @@ public class Product {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
+
+    @ManyToOne
+    private User seller;  //seller_id -> DB에 표시될 이름
+
+    @Column(nullable = false, length = 50)
     private String name; // 상품 이름
+    @Column(nullable = false)
     private Integer price; // 상품 가격
+    @Column(nullable = false)
     private Integer qty; // 상품 재고
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
 
+
+   //판매자 상품 변경 (판매자 입장)
+   public void update(String name, Integer price, Integer qty){
+       this.name=name;
+       this.price=price;
+       this.qty=qty;
+   }
+
+   //주문시 재고 변경 (구매자 입장)
+   public void updateQty(Integer orderCount){
+       if (this.qty<orderCount){
+           //checkpoint 주문수량이 재고 수량을 초과하였습니다.
+       }
+       this.qty= this.qty- orderCount;
+   }
+   //주문 취소 재고 변경 ( 구매자, 판매자)
+
+    public void rollback(Integer orderCount){
+       this.qty= this.qty+orderCount;
+    }
+
+
     @PrePersist
     protected void onCreate() {
         this.createdAt = LocalDateTime.now();
@@ -34,8 +64,9 @@ protected void onUpdate() {
     }
 
     @Builder
-    public Product(Long id, String name, Integer price, Integer qty, LocalDateTime createdAt, LocalDateTime updatedAt) {
+    public Product(Long id, User seller, String name, Integer price, Integer qty, LocalDateTime createdAt, LocalDateTime updatedAt) {
         this.id = id;
+        this.seller = seller;
         this.name = name;
         this.price = price;
         this.qty = qty;
diff --git a/src/main/java/shop/mtcoding/metamall/model/user/User.java b/src/main/java/shop/mtcoding/metamall/model/user/User.java
index c929ce5..c228dcb 100644
--- a/src/main/java/shop/mtcoding/metamall/model/user/User.java
+++ b/src/main/java/shop/mtcoding/metamall/model/user/User.java
@@ -1,5 +1,6 @@
 package shop.mtcoding.metamall.model.user;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import lombok.Builder;
 import lombok.Getter;
 import lombok.NoArgsConstructor;
@@ -17,13 +18,41 @@ public class User {
     @Id
     @GeneratedValue(strategy = GenerationType.IDENTITY)
     private Long id;
+    @Column(unique = true, nullable = false, length = 20)
     private String username;
+    @JsonIgnore
+    @Column(nullable = false,length = 60) //1234 -> 단방향 암호화 60Byte
     private String password;
+    @Column(nullable = false,length = 50)
     private String email;
+    @Column(nullable = false,length = 10)
     private String role; // USER(고객), SELLER(판매자), ADMIN(관리자)
+
+    @Column(nullable = false, length = 10)
+    private Boolean status; // true 활성게정 , false 비활성게정
+
+
+    @Column(nullable = false)
     private LocalDateTime createdAt;
     private LocalDateTime updatedAt;
 
+
+    //권한 변경(관리자)
+    public void updateRole(String role){
+        if (this.role.equals(role)){
+            //checkpoint 동일한 권한으로 변경할 수 없습니다.
+        }
+        this.role=role;
+    }
+    //회원 탈퇴
+    public void delete(){
+        this.status=false;
+    }
+
+
+
+
+
     @PrePersist
     protected void onCreate() {
         this.createdAt = LocalDateTime.now();
@@ -35,12 +64,14 @@ protected void onUpdate() {
     }
 
     @Builder
-    public User(Long id, String username, String password, String email, String role, LocalDateTime createdAt) {
+    public User(Long id, String username, String password, String email, String role, Boolean status, LocalDateTime createdAt, LocalDateTime updatedAt) {
         this.id = id;
         this.username = username;
         this.password = password;
         this.email = email;
         this.role = role;
+        this.status = status;
         this.createdAt = createdAt;
+        this.updatedAt = updatedAt;
     }
 }
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 1d9bd50..dccdf4c 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -22,6 +22,18 @@ spring:
         format_sql: true
       default_batch_fetch_size: 100 # in query 자동 작성
 
+      # 404 처리하는 법
+
+ mvc:
+   throw-exception-if-no-handler-found: true
+   web:
+     resources:
+       add-mappings: false
+
+# hibernateLazyInitializer 오류 해결법
+# jackson:
+
+
 logging:
   level:
     '[shop.mtcoding.metamall]': DEBUG # DEBUG 레벨부터 에러 확인할 수 있게 설정하기