```python
# play.py
from playwright.async_api import async_playwright as aP
import xvfbwrapper, io, os
from db import DB

async def Page(browser='chromium', headless=True):
    if headless: xvfbwrapper.Xvfb().start()
    else: os.environ['DISPLAY'] = ':0'
    db = DB()

    playwright = await aP().start()
    browser = await getattr(playwright, browser).launch(headless=False)
    context = await browser.new_context(accept_downloads=True)
    context.set_default_timeout(0)

    async def save(response):
        if response.ok and not db.exists(url := response.url):
            db[url] = await response.body()
        
    async def load(route):
        if body := db[route.request.url]:
            return await route.fulfill(body=body)
        await route.continue_()

    context.on('response', save)
    await context.route('**/*', load)
    for block in ['**/*.gif', '**/css*.js']:
        await context.route(block, lambda route: route.abort())
        
    return await context.new_page()

async def main():
    page = await Page()
    await page.goto('https://naver.com')
    await page.screenshot(path='screenshot.png')

if __name__ == "__main__":
    asyncio.run(main())
```

```python
# db.py

import sqlite3, json


class DB(sqlite3.Connection):
    def __init__(self, db_name=".db.sqlite"):
        super().__init__(db_name)
        with self:
            cur = self.execute("""
                CREATE TABLE IF NOT EXISTS kv_store
                (key TEXT PRIMARY KEY, value BLOB)
            """)

    def __setitem__(self, key, value):
        value = value if isinstance(value, bytes) else json.dumps(value)
        with self:
            cur = self.execute("""
                INSERT OR REPLACE INTO kv_store
                (key, value) VALUES (?, ?)
            """, (key, value))
            return {"modified_count": cur.rowcount}

    def __getitem__(self, key):
        with self:
            cur = self.execute("""
                SELECT value FROM kv_store
                WHERE key = ?
            """, (key,))
            result = cur.fetchone()
        if result:
            if isinstance(result[0], str):
                try:
                    return json.loads(result[0])
                except json.JSONDecodeError:
                    pass
            return result[0]

    def delete(self, key):
        with self:
            cur = self.execute("""
                DELETE FROM kv_store 
                WHERE key = ?
            """, (key,))
            return {"deleted_count": cur.rowcount}

    def keys(self, pattern="*"):
        pattern = pattern.translate(str.maketrans(
            {"\\": "\\\\", "%": "\\%", "_": "\\_", "*": "%", "?": "_"}))
        with self:
            cur = self.execute("""
                SELECT key FROM kv_store
                WHERE key LIKE ? ESCAPE '\\'
            """, (pattern,))
            result = cur.fetchall()
        return [row[0] for row in result]

    def __repr__(self): return repr(self.keys())

    def exists(self, key):
        with self:
            cur = self.execute("""
                SELECT 1 FROM kv_store
                WHERE key = ?
                LIMIT 1
            """, (key,))
            return bool(cur.fetchone())


if __name__ == "__main__":
    db = DB()

    # 문자열 저장 및 조회
    db["hello"] = "world"
    print(db["hello"])  # 출력: world (str 타입)

    # 숫자 저장 및 조회
    db["number"] = 42
    print(db["number"])  # 출력: 42 (int 타입)

    # 바이너리 데이터 저장 및 조회
    db["binary"] = b"binary data"
    print(db["binary"])  # 출력: b'binary data' (bytes 타입)

    # 복잡한 객체 저장
    complex_obj = {"name": "John", "age": 30, "city": "New York"}
    db["complex"] = complex_obj
    loaded_obj = db["complex"]
    print(
        loaded_obj
    )  # 출력: {'name': 'John', 'age': 30, 'city': 'New York'} (dict 타입)

    db["test_key"] = "test_value"

    print(db.exists("test_key"))  # True
    print(db.exists("non_existent_key"))  # False
```