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A series of linked murder cases sparked a frenzy and unrest in the city. In each case, the victims were tortured to death in a ritualistic manner, and all the clues pointed to one person—Fang Mu (played by Deng Chao), a genius detective skilled in criminal psychology. While investigating the cases with his colleague Mi Nan (played by Liu Shishi), Fang Mu discovers that his former high school classmate, Jiang Ya (played by Ruan Jingtian), seems to be hiding many secrets. Meanwhile, an online user named "City Light" appears, initiating a poll to let the public decide the fate of lawyer Ren Chuan (played by Guo Jingfei). Despite using every means possible, Fang Mu, Mi Nan, and the other police officers are unable to stop this "violence begets violence" dark trial, plunging the city into chaos. At a critical moment, Fang Mu realizes that Jiang Ya's wife, Wei Wei (played by Lam Ka Hei), is the key witness to unlock Jiang Ya's secrets. Just as the truth is about to be revealed, a shocking turn of events occurs...