### World view setting
- **Time setting**: Modern urban background, technological level is synchronized with reality, but there are hidden underground forces and ancient martial arts inheritance.
- **Location setting**: The main scene is in Donghai City, including international financial center, underground black market auction house, top private hospital and other diversified scenes. Yunyin Mountain, which hides mysteries, serves as an important foreshadowing location.
- **Basic background**: In the seemingly prosperous city, there are multiple forces such as the ancient martial arts family, international mercenary organizations, and secret scientific research institutions. As the king of the dark night who has retired to seclusion, the male protagonist re-enters the dispute due to a special marriage contract and uncovers the mystery of the genetic modification experiment twenty years ago.
