diff --git a/src/main/java/com/example/nto/service/impl/UserDetailsServiceImpl.java b/src/main/java/com/example/nto/service/impl/UserDetailsServiceImpl.java
index cf8cdb3..511a8d9 100644
--- a/src/main/java/com/example/nto/service/impl/UserDetailsServiceImpl.java
+++ b/src/main/java/com/example/nto/service/impl/UserDetailsServiceImpl.java
@@ -1,14 +1,24 @@
 package com.example.nto.service.impl;
 
+import com.example.nto.domain.entity.Employee;
+import com.example.nto.repository.EmployeeRepository;
+import lombok.AllArgsConstructor;
 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;
 
+import java.util.Optional;
+
 @Service
+@AllArgsConstructor
 public class UserDetailsServiceImpl implements UserDetailsService {
+    private final EmployeeRepository employeeRepository;
+
     @Override
-    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
-        return null;
+    public UserDetails loadUserByUsername(String email) throws UsernameNotFoundException {
+        Optional<Employee> employee = employeeRepository.findByEmail(email);
+        if (employee.isEmpty()) throw new UsernameNotFoundException("Employee not found!");
+        return employee.get();
     }
 }