diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 0cb68650..e4dfc19f 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -37,6 +37,7 @@ jobs:
           USER_APIKEY=${{ secrets.USER_APIKEY }}
           SSL_PASSWORD=${{ secrets.SSL_PASSWORD }}
           EC2_PORT=${{ secrets.EC2_PORT }}
+          APP_ADMIN_EMAIL=${{ secrets.APP_ADMIN_EMAIL }}
           ENV_EOF
 
       - name: Build with Gradle
@@ -107,7 +108,7 @@ jobs:
 
           # 5️⃣ Start Spring Boot on HTTPS port
           echo "=== Launching Spring Boot on port $EC2_PORT ==="
-          nohup sudo java -jar -Dspring.profiles.active=prod $JAR_PATH > /home/ubuntu/app.log 2>&1 &
+          nohup sudo -E java -jar -Dspring.profiles.active=prod $JAR_PATH > /dev/null 2>> /home/ubuntu/error.log &
 
           sleep 5
 
diff --git a/src/main/java/oneclass/oneclass/domain/member/entity/Member.java b/src/main/java/oneclass/oneclass/domain/member/entity/Member.java
index 536faf4d..1fe0a275 100644
--- a/src/main/java/oneclass/oneclass/domain/member/entity/Member.java
+++ b/src/main/java/oneclass/oneclass/domain/member/entity/Member.java
@@ -30,8 +30,7 @@ public class Member {
     @NotBlank
     private String username;
 
-    @Column(nullable = false, length = 100)
-    @NotBlank
+    @Column(length = 100)
     private String email;
 
     @JsonIgnore
diff --git a/src/main/java/oneclass/oneclass/global/exception/CommonError.java b/src/main/java/oneclass/oneclass/global/exception/CommonError.java
index f7fd3888..844361d8 100644
--- a/src/main/java/oneclass/oneclass/global/exception/CommonError.java
+++ b/src/main/java/oneclass/oneclass/global/exception/CommonError.java
@@ -6,7 +6,7 @@
 @Getter
 @RequiredArgsConstructor
 public enum CommonError implements CustomError {
-    INVALID_INPUT_VALUE(400, "유효하지 않은 입력입니다.");
+    INVALID_INPUT_VALUE(400, "유효하지 않은 입력입니다. %s");
 
     private final int status;
     private final String message;
diff --git a/src/main/java/oneclass/oneclass/global/exception/GlobalExceptionHandler.java b/src/main/java/oneclass/oneclass/global/exception/GlobalExceptionHandler.java
index cbdc528d..622d1d7c 100644
--- a/src/main/java/oneclass/oneclass/global/exception/GlobalExceptionHandler.java
+++ b/src/main/java/oneclass/oneclass/global/exception/GlobalExceptionHandler.java
@@ -1,5 +1,6 @@
 package oneclass.oneclass.global.exception;
 
+import lombok.extern.slf4j.Slf4j;
 import oneclass.oneclass.domain.attendance.entity.AttendanceStatus;
 import oneclass.oneclass.domain.attendance.error.AttendanceError;
 import oneclass.oneclass.global.dto.ApiResponse;
@@ -13,12 +14,14 @@
 
 import java.util.stream.Collectors;
 
+@Slf4j
 @RestControllerAdvice
 public class GlobalExceptionHandler {
 
     // CustomException 처리
     @ExceptionHandler(CustomException.class)
     public ResponseEntity<ApiResponse<Void>> handleCustomException(CustomException e) {
+        log.warn("CustomException: {} - {}", e.getStatus(), e.getMessage());
         return ResponseEntity.status(e.getStatus())
                 .body(ApiResponse.error(e));
     }
@@ -32,6 +35,8 @@ public ResponseEntity<ApiResponse<Void>> handleValidationExceptions(MethodArgume
                 .map(FieldError::getDefaultMessage)
                 .collect(Collectors.joining(", "));
 
+        log.info("Validation Error: {}", errors); // 간단한 정보 로그
+
         CustomException customException =
                 new CustomException(CommonError.INVALID_INPUT_VALUE, errors);
 
@@ -43,6 +48,7 @@ public ResponseEntity<ApiResponse<Void>> handleValidationExceptions(MethodArgume
     // Enum 타입 불일치 등 @RequestParam / @PathVariable 타입 오류 처리
     @ExceptionHandler(MethodArgumentTypeMismatchException.class)
     public ResponseEntity<ApiResponse<Void>> handleTypeMismatch(MethodArgumentTypeMismatchException ex) {
+        log.info("Type Mismatch: {}", ex.getValue()); // 정보 로그
         if (ex.getRequiredType() == AttendanceStatus.class) {
             CustomException customException =
                     new CustomException(AttendanceError.INVALID_STATUS, ex.getValue() + "는 올바른 출석 상태가 아닙니다.");
@@ -64,6 +70,7 @@ public ResponseEntity<ApiResponse<Void>> handleTypeMismatch(MethodArgumentTypeMi
     // 그 외 모든 예외 처리
     @ExceptionHandler(Exception.class)
     public ResponseEntity<ApiResponse<Void>> handleException(Exception e) {
+        log.error("🚨🚨🚨🚨🚨🚨🚨🚨🚨🚨 Unhandled Exception occurred: ", e);
         ErrorResponse errorResponse = new ErrorResponse(
                 "INTERNAL_SERVER_ERROR",
                 HttpStatus.INTERNAL_SERVER_ERROR.value(),
diff --git a/src/main/resources/application-dev.yml b/src/main/resources/application-dev.yml
index e29924ef..337c8b84 100644
--- a/src/main/resources/application-dev.yml
+++ b/src/main/resources/application-dev.yml
@@ -31,11 +31,6 @@ spring:
           starttls.enable: true
           ssl.trust: smtp.gmail.com
 
-
-  app:
-    admin:
-      email: ${app.admin.email}
-
 server:
   port: 8080
 
diff --git a/src/main/resources/logback-spring.xml b/src/main/resources/logback-spring.xml
new file mode 100644
index 00000000..24b81908
--- /dev/null
+++ b/src/main/resources/logback-spring.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <property name="LOG_PATH" value="/home/ubuntu/logs"/>
+    <property name="LOG_FILE_NAME" value="application"/>
+
+    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
+        <file>${LOG_PATH}/${LOG_FILE_NAME}.log</file>
+        <encoder>
+            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS, Asia/Seoul} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
+            <fileNamePattern>${LOG_PATH}/${LOG_FILE_NAME}-%d{yyyy-MM-dd}.log</fileNamePattern>
+            <maxHistory>30</maxHistory>
+        </rollingPolicy>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="FILE" />
+    </root>
+</configuration>
\ No newline at end of file