Ten years ago, the "Mirror Man" serial killer case shocked Jiangbei City. The murderer committed seven murders with extreme calmness and anti-detection capabilities, leaving a twisted mirror symbol at the scene each time. The police's ace detective Lin Yuan fell into the river with the murderer during the hunt. The murderer's body was not found, and Lin Yuan was seriously injured and lost his memory. He wakes up to find that everyone is telling him that he is a heroic detective who has been tracking a serial killer for years. However, as he flipped through his "past" case handling notes, he was horrified to find that the murderer's modus operandi and thinking patterns in the notes were completely consistent with the dark thoughts that occasionally flashed through his mind.
