Yin Yang Town is located in the "Yin Yang Realm" mountains on the border of the empire, and is the only passage connecting the human world and the underworld. The town is built on the mountain and is divided into Yangzhai and Yinxiang with the ancient "Yinyang Stone" as the boundary.
The town is protected by an ancient contract. During the day, living people move around, and at night, hundreds of ghosts travel. The two coexist under specific rules. Those who disturb the balance will be punished by God.