diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..8af972c
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,3 @@
+/gradlew text eol=lf
+*.bat text eol=crlf
+*.jar binary
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c2065bc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,37 @@
+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
diff --git a/README.md b/README.md
index ebeffaf..1a706e0 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,192 @@
 # spring-tutorial-21st
 CEOS back-end 21st spring tutorial project
+
+# 1주차
+
+## POJO
+
+: 특정 프레임워크나 라이브러리에 의존하지 않는 순수 자바 코드
+
+---
+
+## Spring
+
+: 자바 기반 객체지향적으로 서버 설계를 편리하게 도와주는 프레임워크. 주로 빈을 통해 객체를 관리하는 컨테이너 역할
+
+- **객체지향 5원칙**
+    - **S**: Single Responsibility ⇒ 책임분리(AOP, 관점지향 프로그래밍)
+    - **O**: Open closed principle ⇒ 인터페이스에 의존하고 구현체에 의존하지 않는다(PSA, 서비스 추상화)
+    - **L**: 리스코프 치환법칙 ⇒ 상속할 때 주의해라. (자식은 부모의 기능을 온전히 수행 가능해야함)
+
+      **ex1)** 잘못된 상속: Rectangle로 Square 인스턴스를 받아도 밑변과 높이를 서로 다르게 설정이 불가능함  
+      Rectangle ← Square
+
+      // 코드  
+      Rectange rec = new Square();  
+      rec.setHeight(10);  
+      rec.setWidth(15); // !!!!!!!!!!!!오류 발생. width, height 모두 15로 설정됨.
+
+      **ex2)** 잘한 상속:  
+      List ← ArrayList  
+      ← LinkedList
+
+    - **I**: Inversion of Control ⇒ 스프링 컨테이너가 객체 관리
+    - **D**: Dependency Injection ⇒ 관리 중인 객체를 삽입
+
+---
+
+**Q. 스프링이 POJO 프레임워크라고 함은 무슨 의미?**
+
+⇒ 개발자의 선택에 따라 스프링에 의존할지 안할지 결정 가능 (POJO 객체를 쓸지 말지 선택 가능)
+
+/** POJO 코드
+* 스프링 없어도 돌아감
+  */
+
+@Service  
+public class MemberService {  
+private MemberRepository memberRepository;  
+//...  
+}
+
+//NOT POJO  
+@Controller  
+public class MemberController {  
+@GetMapping("/members")  
+public String getMembers() {}  
+}
+
+---
+
+## AOP (Aspect Oriented Programming, 관점 지향 프로그래밍)
+
+: 비즈니스 로직과 관리 로직 관심사를 분리
+
+**ex)** Service 계층에서 (비즈니스 로직, 트랜잭션 관리 코드)를 분리
+
+---
+
+## PSA (Portable Service Abstraction)
+
+: 특정 기술에 종속적이지 않은 설계 = 인터페이스에 의존하고 구현체에 의존 X
+
+**ex)** 데이터 접근 기술 중 JPA, JDBC 로 변경하여도 코드의 변경은 최소화된다.  
+`PlatformTransactionManager`
+- JpaTransactionManager (JPA)
+- DataSourceTransactionManager (JDBC)
+
+---
+
+## Spring Boot
+
+- 내장 톰캣
+- 의존성 관리
+- 설정 자동화
+- 모니터링 (성능 측정, 메트릭 확인)
+
+---
+
+## 1. 스프링 빈
+
+- **의미:** 스프링 컨테이너에서 생성과 소멸을 관리하는 **싱글톤 객체**  
+  싱글톤 객체: 동일한 인스턴스로 같은 메모리 점유
+
+- **생명주기:**  
+  객체 생성 → 의존성 주입 → 초기화 → 사용 중 → 소멸
+
+**Q. @PostConstruct가 적용되는 시점은?**  
+⇒ 초기화 단계의 **마지막**에 호출된다.  
+객체가 생성(메모리 힙에 할당), 의존성이 주입되고 필요한 설정들도 끝난 초기화의 마지막 단계.  
+(이때 개발자가 원하는 추가 설정이 가능)
+
+---
+
+## 2. 스프링 빈 등록 방법
+
+- `@Bean`을 사용한 직접 등록
+- `@Component` 사용 (`@Service`, `@Repository`, `@Controller`)
+- `@ComponentScan(basePackages = " ")`
+  : 지정 패키지(없다면 현재 패키지) 하위의 @Component를 찾으면 자동 빈 등록
+
+---
+
+## 3. 어노테이션
+
+- **기능**
+    - 메타 데이터  
+      ex) `@Override`
+    - 특정 기능을 가짐  
+      ex) `@Component`, `@PostConstruct`
+
+// 코드  
+@Target(ElementType.???) // TYPE, METHOD, FIELD  
+@Retention(RetentionPolicy.???) // RUNTIME, CLASS, SOURCE  
+public @interface CustomAnnotation {}
+
+---
+
+## 4. 스프링 Context 구조
+
+- **BeanDefinitionRegistry**와 **BeanFactory** 상속관계
+
+`DefaultListableBeanFactory` (클래스, 구현체)  
+→ *BeanFactory 인터페이스*  
+→ *BeanDefinitionRegistry 인터페이스*
+
+`AnnotationConfigApplicationContext` (자식)  
+→ `GenericApplicationContext` (부모)  
+→ *BeanFactory 인터페이스*  
+→ *BeanDefinitionRegistry 인터페이스*
+
+// 코드  
+public class GenericApplicationContext implements BeanFactory, BeanDefinitionRegistry {  
+private DefaultListableBeanFactory beanFactory;
+
+    public Object getBean() {  
+        beanFactory.getBean(); // 위임  
+    }  
+}
+
+---
+
+## 5. 테스트 코드
+
+### 1. **단위 테스트**
+
+: 외부 환경과는 분리된 순수한 코드 로직을 대상으로 검증
+
+// 코드  
+@ExtendWith(MockitoExtension.class)  
+class MemberServiceTest {  
+@Mock  
+private MemberRepository memberRepository;
+
+    @InjectMocks  
+    private MemberService memberService;  
+    
+    @Test  
+    void findById() {  
+        // given  
+        Member member = new Member(...);  
+        when(memberRepository.findById(1L))  
+            .thenReturn(Optional.of(new Member("olaf")));  
+
+        // when  
+        Member findMember = memberService.findById(1L);  
+
+        // then  
+        Assertions.assertThat(findMember.getName()).isEqualTo("olaf");  
+    }  
+}
+
+---
+
+### 2. **통합 테스트**
+
+: API 요청, DB 연결과 같은 외부 환경을 포함하여 시스템의 전체적인 동작을 검증
+
+// 코드  
+@SpringBootTest // 스프링 환경에서 통합테스트  
+@AutoConfigureMockMvc // API 호출 테스트  
+class ApiTest {  
+}
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..b468f2f
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,35 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '3.4.3'
+	id 'io.spring.dependency-management' version '1.1.7'
+}
+
+group = 'com.ceos21'
+version = '0.0.1-SNAPSHOT'
+
+java {
+	toolchain {
+		languageVersion = JavaLanguageVersion.of(17)
+	}
+}
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter-web'
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+	//h2
+	runtimeOnly 'com.h2database:h2'
+	//lombok
+	compileOnly 'org.projectlombok:lombok'
+	annotationProcessor 'org.projectlombok:lombok'
+
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+}
+
+tasks.named('test') {
+	useJUnitPlatform()
+}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..9bbc975
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..37f853b
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100644
index 0000000..faf9300
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..9d21a21
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..19b5204
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = 'spring-boot'
diff --git a/src/main/java/com/ceos21/spring_boot/Application.java b/src/main/java/com/ceos21/spring_boot/Application.java
new file mode 100644
index 0000000..438c1fb
--- /dev/null
+++ b/src/main/java/com/ceos21/spring_boot/Application.java
@@ -0,0 +1,31 @@
+package com.ceos21.spring_boot;
+
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+
+import java.util.Arrays;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+	@Bean
+	public CommandLineRunner commandLineRunner(ApplicationContext context) {
+		return args -> {
+			System.out.println("beans provided by Spring Boot");
+
+			String[] beanDefinitionNames = context.getBeanDefinitionNames();
+			Arrays.sort(beanDefinitionNames);
+			for (String beanName : beanDefinitionNames) {
+				System.out.println(beanName);
+			}
+		};
+	}
+
+}
diff --git a/src/main/java/com/ceos21/spring_boot/HealthController.java b/src/main/java/com/ceos21/spring_boot/HealthController.java
new file mode 100644
index 0000000..1065737
--- /dev/null
+++ b/src/main/java/com/ceos21/spring_boot/HealthController.java
@@ -0,0 +1,12 @@
+package com.ceos21.spring_boot;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class HealthController {
+    @GetMapping("/health-check")
+    public String healthCheck() {
+        return "it's healthy";
+    }
+}
diff --git a/src/main/java/com/ceos21/spring_boot/HomeController.java b/src/main/java/com/ceos21/spring_boot/HomeController.java
new file mode 100644
index 0000000..9c1207e
--- /dev/null
+++ b/src/main/java/com/ceos21/spring_boot/HomeController.java
@@ -0,0 +1,12 @@
+package com.ceos21.spring_boot;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class HomeController {
+    @GetMapping("/")
+    public String home() {
+        return "hallo world";
+    }
+}
diff --git a/src/main/java/com/ceos21/spring_boot/Test.java b/src/main/java/com/ceos21/spring_boot/Test.java
new file mode 100644
index 0000000..e105205
--- /dev/null
+++ b/src/main/java/com/ceos21/spring_boot/Test.java
@@ -0,0 +1,13 @@
+package com.ceos21.spring_boot;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import lombok.Data;
+
+@Data
+@Entity
+public class Test {
+    @Id
+    private Long id;
+    private String name;
+}
diff --git a/src/main/java/com/ceos21/spring_boot/TestController.java b/src/main/java/com/ceos21/spring_boot/TestController.java
new file mode 100644
index 0000000..41c662b
--- /dev/null
+++ b/src/main/java/com/ceos21/spring_boot/TestController.java
@@ -0,0 +1,21 @@
+package com.ceos21.spring_boot;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@RequiredArgsConstructor
+@RequestMapping("/tests")
+@RestController
+public class TestController {
+    private final TestService testService;
+
+    @GetMapping
+    public List<Test> findAllTest() {
+        return testService.findAllTest();
+    }
+
+}
diff --git a/src/main/java/com/ceos21/spring_boot/TestRepository.java b/src/main/java/com/ceos21/spring_boot/TestRepository.java
new file mode 100644
index 0000000..faaced6
--- /dev/null
+++ b/src/main/java/com/ceos21/spring_boot/TestRepository.java
@@ -0,0 +1,7 @@
+package com.ceos21.spring_boot;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface TestRepository extends JpaRepository<Test,Long> {
+
+}
diff --git a/src/main/java/com/ceos21/spring_boot/TestService.java b/src/main/java/com/ceos21/spring_boot/TestService.java
new file mode 100644
index 0000000..c37d4a7
--- /dev/null
+++ b/src/main/java/com/ceos21/spring_boot/TestService.java
@@ -0,0 +1,18 @@
+package com.ceos21.spring_boot;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+@RequiredArgsConstructor
+@Service
+public class TestService {
+    private final TestRepository testRepository;
+
+    @Transactional(readOnly = true)
+    public List<Test> findAllTest() {
+        return testRepository.findAll();
+    }
+}
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
new file mode 100644
index 0000000..2df57a4
--- /dev/null
+++ b/src/main/resources/application.yml
@@ -0,0 +1,16 @@
+spring:
+  datasource:
+    url: jdbc:h2:tcp://localhost/~/ceos21
+    username: sa
+    password:
+
+  jpa:
+    hibernate:
+      ddl-auto: create
+    properties:
+      hibernate:
+        format_sql: true
+
+logging:
+  level:
+    org.hibernate.SQL: debug
diff --git a/src/test/java/com/ceos21/spring_boot/ApplicationTests.java b/src/test/java/com/ceos21/spring_boot/ApplicationTests.java
new file mode 100644
index 0000000..cfbe7af
--- /dev/null
+++ b/src/test/java/com/ceos21/spring_boot/ApplicationTests.java
@@ -0,0 +1,13 @@
+package com.ceos21.spring_boot;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class ApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}
diff --git a/src/test/java/com/ceos21/spring_boot/controller/HealthControllerTest.java b/src/test/java/com/ceos21/spring_boot/controller/HealthControllerTest.java
new file mode 100644
index 0000000..afe2dc6
--- /dev/null
+++ b/src/test/java/com/ceos21/spring_boot/controller/HealthControllerTest.java
@@ -0,0 +1,29 @@
+package com.ceos21.spring_boot.controller;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+@SpringBootTest
+@AutoConfigureMockMvc
+class HealthControllerTest {
+    @Autowired
+    private MockMvc mvc;
+
+    @Test
+    @DisplayName("상태체크 함수를 테스트합니다")
+    void healthCheck() throws Exception {
+        mvc.perform(MockMvcRequestBuilders.get("/health-check").accept(MediaType.APPLICATION_JSON))
+                .andExpect(status().isOk())
+                .andExpect(content().string("it's healthy"));
+
+    }
+}
\ No newline at end of file