The ending of Fan Mu, the famous profiler, tells of a series of murders committed by a vengeful criminal under the pseudonym “City Lights.” A math teacher is killed for humiliating one of his students, and it soon becomes clear that he’s not the only victim. Using the internet, the killer offers city residents to choose the next victim. Fan Mu and his colleague Mi Nan try to catch the murderer, and soon face an astonishing fact: all the evidence points to Sun Pu, an individual possibly returned from the grave—the murderer from Zhejiang University.