1. **Time Travel Background:** Yun Zhao, an ordinary modern office worker, experiences a sudden death or car accident, and her soul travels to a vast world of immortal cultivation called the "Xuanhuang Realm."

2. **Binding System:** **"Wanjie Sign-in System." The system's origins are mysterious (to be revealed later).

Core Rules: * **Daily Sign-in:** Sign in once per day at any location (the more unique the location, the greater its significance, and the greater the first sign-in reward).