diff --git a/src/main/java/com/example/demo/app/domain/model/LoginModel.java b/src/main/java/com/example/demo/app/domain/model/LoginModel.java
new file mode 100644
index 0000000..f9c2e93
--- /dev/null
+++ b/src/main/java/com/example/demo/app/domain/model/LoginModel.java
@@ -0,0 +1,10 @@
+package com.example.demo.app.domain.model;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter
+@AllArgsConstructor
+public class LoginModel {
+	private Long userId;
+}
diff --git a/src/main/java/com/example/demo/app/domain/service/LoginService.java b/src/main/java/com/example/demo/app/domain/service/LoginService.java
index 4908194..547a5d7 100644
--- a/src/main/java/com/example/demo/app/domain/service/LoginService.java
+++ b/src/main/java/com/example/demo/app/domain/service/LoginService.java
@@ -1,9 +1,9 @@
 package com.example.demo.app.domain.service;
 
-import com.example.demo.app.infra.entity.UserEntity;
+import com.example.demo.app.domain.model.LoginModel;
 
 public interface LoginService {
 
-	UserEntity login(String mailAddress, String password);
+	LoginModel login(String mailAddress, String password);
 }
 
diff --git a/src/main/java/com/example/demo/app/domain/service/AnalysisServiceImpl.java b/src/main/java/com/example/demo/app/domain/service/impl/AnalysisServiceImpl.java
similarity index 89%
rename from src/main/java/com/example/demo/app/domain/service/AnalysisServiceImpl.java
rename to src/main/java/com/example/demo/app/domain/service/impl/AnalysisServiceImpl.java
index a75a085..66f4bbc 100644
--- a/src/main/java/com/example/demo/app/domain/service/AnalysisServiceImpl.java
+++ b/src/main/java/com/example/demo/app/domain/service/impl/AnalysisServiceImpl.java
@@ -1,8 +1,9 @@
-package com.example.demo.app.domain.service;
+package com.example.demo.app.domain.service.impl;
 
 import org.springframework.stereotype.Service;
 
 import com.example.demo.app.domain.model.AnalysisModel;
+import com.example.demo.app.domain.service.AnalysisService;
 
 import lombok.RequiredArgsConstructor;
 
diff --git a/src/main/java/com/example/demo/app/domain/service/impl/LoginServiceImpl.java b/src/main/java/com/example/demo/app/domain/service/impl/LoginServiceImpl.java
index ac41c21..9e1563a 100644
--- a/src/main/java/com/example/demo/app/domain/service/impl/LoginServiceImpl.java
+++ b/src/main/java/com/example/demo/app/domain/service/impl/LoginServiceImpl.java
@@ -2,6 +2,7 @@ package com.example.demo.app.domain.service.impl;
 
 import org.springframework.stereotype.Service;
 
+import com.example.demo.app.domain.model.LoginModel;
 import com.example.demo.app.domain.service.LoginService;
 import com.example.demo.app.infra.entity.UserEntity;
 import com.example.demo.app.infra.repository.UserRepository;
@@ -15,11 +16,16 @@ public class LoginServiceImpl implements LoginService {
     private final UserRepository userRepository;
 
     @Override
-    public UserEntity login(String mailAddress, String password) {
+    public LoginModel login(String mailAddress, String password) {
 
-        return userRepository.findByMailAddressAndPassword(
+        UserEntity userEntity = userRepository.findByMailAddressAndPassword(
                 mailAddress,
                 password).orElse(null);
+
+        if (userEntity == null) {
+            return null;
+        }
+
+        return new LoginModel(userEntity.getUserId());
     }
 }
-
diff --git a/src/main/java/com/example/demo/app/infra/repository/TransactionRepository.java b/src/main/java/com/example/demo/app/infra/repository/TransactionRepository.java
index 933aa4f..c747917 100644
--- a/src/main/java/com/example/demo/app/infra/repository/TransactionRepository.java
+++ b/src/main/java/com/example/demo/app/infra/repository/TransactionRepository.java
@@ -21,5 +21,7 @@ public interface TransactionRepository extends JpaRepository<TransactionEntity,
 
 	@Query("select sum(t.amount) from TransactionEntity t inner join CategoryEntity c on t.categoryId = c.categoryId where (t.userId = :userId and t.transactionDate between :startDate and :endDate) and c.transactionType = 1")
 	public Integer findTotalIncome(LocalDate startDate, LocalDate endDate, Long userId);
-
+	
+	@Query("select sum(t.amount) from TransactionEntity t where t.userEntity.userId = :userId and t.categoryEntity.categoryId = :categoryId and t.transactionDate between :startDate and :endDate")
+	public Integer findCategoryExpense(LocalDate startDate, LocalDate endDate, Long userId, Long categoryId);
 }
diff --git a/src/main/java/com/example/demo/app/presentation/controller/LoginController.java b/src/main/java/com/example/demo/app/presentation/controller/LoginController.java
index 2e1439f..20ac8c5 100644
--- a/src/main/java/com/example/demo/app/presentation/controller/LoginController.java
+++ b/src/main/java/com/example/demo/app/presentation/controller/LoginController.java
@@ -8,8 +8,8 @@ import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.ModelAttribute;
 import org.springframework.web.bind.annotation.PostMapping;
 
+import com.example.demo.app.domain.model.LoginModel;
 import com.example.demo.app.domain.service.LoginService;
-import com.example.demo.app.infra.entity.UserEntity;
 import com.example.demo.app.presentation.form.LoginForm;
 
 import lombok.RequiredArgsConstructor;
@@ -33,13 +33,14 @@ public class LoginController {
     @PostMapping("/login")
     public String login(
             @ModelAttribute LoginForm loginForm,
-            Model model, HttpSession session) {
+            Model model,
+            HttpSession session) {
 
-        UserEntity loginUser = loginService.login(
+        LoginModel loginModel = loginService.login(
                 loginForm.getMailAddress(),
                 loginForm.getPassword());
 
-        if (loginUser == null) {
+        if (loginModel == null) {
             model.addAttribute(
                     "errorMessage",
                     "Email address or password is incorrect.");
@@ -47,9 +48,8 @@ public class LoginController {
             return "login";
         }
 
-        session.setAttribute("loginUser", loginUser);
+        session.setAttribute("loginUser", loginModel);
 
         return "menu";
     }
 }
-