Jiangcheng, a bustling city with flashing neon lights, has recently been shrouded in the shadow of serial murders. Three victims were killed one after another. There was no sign of struggle at the scene, except for a strange "∞" symbol drawn with blood beside the bodies. The case has no clue and the police are in a deadlock. Lin Lan, the leader of the serious crime team of the Municipal Public Security Bureau, has to turn to Lu Chen, a "genius profiler" who resigned three years ago. Lu Chen had originally decided to stay away from the police force, but was attracted by the strangeness of the case and the strange symbols, and was re-involved in this game with the devil. As the investigation deepened, he discovered that the victims seemed to have no connection, but in fact they were inextricably linked. Behind the "∞" symbol were the murderer's distorted values and a carefully planned revenge plan. What's even more frightening is that the case seems to be secretly related to the "Rose Killer Case" that ruined his reputation three years ago. Lu Chen must not only solve the serial puzzle in front of him, but also face the shadow of his past. In the intertwining neon and shadow of the city, he will start a life and death race with the cunning murderer.
