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A serial murder case plunged the entire city into panic. The murderer was cunning and cruel, and there was no flaw in every crime. Officer Chen, who is in charge of the case, is the calmest and best at psychological games in the police force. However, as the investigation deepened, Officer Chen gradually discovered that the murderer seemed to intentionally lead him into a carefully designed psychological game. The murderer's goal is not only to escape the sanction of the law, but also to completely break Officer Chen's psychological defense.