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The story takes place in "Xinhai City" in the near future, where technology is advanced but the crime rate has soared. The "Mirror Killer" commits serial crimes - the victim is forced to stare into the mirror before death, leaving a cross mark on his forehead. Lin Mo, the ace detective of the crime team, pursued the case persistently and determined that the murderer was related to the "Rainy Night Serial Case" three years ago. However, during the investigation, he found clues pointing directly to him. As the plot progresses, multiple twists emerge: Lin Mo has a split personality due to post-traumatic stress disorder, and the "Justice Detective" is a false personality implanted, and his true identity was once a killer; his most trusted assistant Su Qing is the mastermind behind the scenes, manipulating his personality to avenge his father; and the mentor Lao Chen, who seems to be hiding clues, is actually the person who knows the shady story and secretly protects Lin Mo. In the end, Lin Mo merged his dual personality, worked with Lao Chen to expose the shady story, and completed the discussion of "self-awareness" and "justice". The mirror was not only a symbol of the case, but also a symbol of self-salvation.