Follows a young man named Xu Qi An as he works as a night patrol officer in Dafeng City. Xu Qi An must utilize his expertise to solve the crimes and defend the citizens of the city as a result of a string of unexplained incidents.

Xu Qi'an, a graduate of the police academy, enters a strange world where there are Confucians, Taoists, Buddhists, demons, and warlocks. He has just awakened to find himself in prison and is about to be exiled to a frontier town in three days' time, so he is valued by an organization of guardians in order to change his fate and thus becomes a Guardian.—CPOP HOME