diff --git a/.github/workflows/check-main-pr.yml b/.github/workflows/check-main-pr.yml
new file mode 100644
index 0000000..dd8128f
--- /dev/null
+++ b/.github/workflows/check-main-pr.yml
@@ -0,0 +1,17 @@
+name: Block PRs to Main except from Develop
+
+on:
+  pull_request:
+    branches:
+      - main  # main 브랜치로 향하는 PR에 대해서만 실행
+
+jobs:
+  check-source-branch:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check source branch
+        if: github.head_ref != 'develop'  # 들어오는 브랜치(source)가 develop이 아니면
+        run: |
+          echo "Error: You can only merge to 'main' from 'develop'."
+          echo "Please change the base branch to 'develop' or merge your changes to 'develop' first."
+          exit 1  # 강제로 에러(Fail)를 발생시켜 머지를 막음
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..aa29a65
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,17 @@
+__pycache__/
+*.py[cod]
+
+.venv/
+
+.env
+.env.*
+
+.pytest_cache/
+.mypy_cache/
+.cache/
+
+.vscode/
+.idea/
+
+.DS_Store
+Thumbs.db
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..4f4cb6e
--- /dev/null
+++ b/README.md
@@ -0,0 +1,59 @@
+# PrimerFlow
+
+
+## 프로젝트 구조
+
+```text
+PrimerFlow-BE/
+├─ api/
+│  ├─ deps.py
+│  └─ v1/
+│     └─ endpoints/        # 엔드포인트 모음
+├─ schemas/                # Pydantic 모델 모음
+│  └─ schemas.py
+├─ algorithms/             # 알고리즘 모음
+├─ docs/                   # 협업 가이드 문서 모음
+│  └─ prompts/
+│  └─ strategy/
+├─ main.py                 # FastAPI 앱 엔트리포인트 
+├─ requirements.txt        # Python 패키지 목록
+├─ README.md
+└─ .gitignore
+```
+
+
+## 개발 환경 설정
+
+### 1. 가상환경 생성 및 활성화
+
+- Windows
+    ```powershell
+    python -m venv .venv
+    .\.venv\Scripts\Activate.ps1    # PowerShell
+    # 또는
+    .\.venv\Scripts\activate.bat    # cmd
+    ```
+- macOS / Linux
+    ```bash
+    python3 -m venv .venv
+    source .venv/bin/activate
+    ```
+
+### 2. 의존성 설치
+
+```powershell
+pip install -r requirements.txt
+```
+
+### 3. 개발 서버 실행
+
+```powershell
+uvicorn main:app --reload
+```
+
+- 기본 엔드포인트: http://localhost:8000/
+- OpenAPI 문서: http://localhost:8000/docs
+- ReDoc 문서: http://localhost:8000/redoc
+
+
+
diff --git a/algorithms/example.py b/algorithms/example.py
new file mode 100644
index 0000000..26830c5
--- /dev/null
+++ b/algorithms/example.py
@@ -0,0 +1 @@
+# 이 파일 지우시고 코드 짜시면 됩니다
\ No newline at end of file
diff --git a/api/deps.py b/api/deps.py
new file mode 100644
index 0000000..0b06487
--- /dev/null
+++ b/api/deps.py
@@ -0,0 +1 @@
+# 의존성 주입
\ No newline at end of file
diff --git a/api/v1/endpoints/health.py b/api/v1/endpoints/health.py
new file mode 100644
index 0000000..877e4ab
--- /dev/null
+++ b/api/v1/endpoints/health.py
@@ -0,0 +1,8 @@
+from fastapi import APIRouter
+
+router = APIRouter()
+
+@router.get("/health", summary="Health check")
+async def health_check():
+    """Simple health check endpoint."""
+    return {"status": "ok"}
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..daf30f2
--- /dev/null
+++ b/main.py
@@ -0,0 +1,2 @@
+from fastapi import FastAPI
+
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..be08dc6
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+fastapi[standard]
\ No newline at end of file
diff --git a/schemas/schemas.py b/schemas/schemas.py
new file mode 100644
index 0000000..385412e
--- /dev/null
+++ b/schemas/schemas.py
@@ -0,0 +1 @@
+# Pydantic 데이터 스키마
\ No newline at end of file