Beitang Yue, 20, is a freelancer.
His father is a policeman and his brother is also a policeman, but Yue has been involved in all kinds of strange incidents since he was a child.
There is also a symbiote named Qing Ji in her body to help her solve the incident.
Keer, a computer geek and paranoid loli girl in western clothes, and Amamiya Yu, a rich second-generation young master with special skills, are Beitang Yue's closest friends.
They followed Bei Tangyue step by step into a carefully arranged mystery. Is it a devil or an angel, hope or despair, that is waiting for them?