During a chase, Li Shun killed Zhang Bo, took away his documents, and pretended to be the deceased Zhang Bo. By mistake, he was arranged to live with Gu Qianzhoutao, the prosecutor's envoy for punishment.
While playing the role of the "extremely smart" chosen murderer, he experienced unprecedented warmth and "home" feeling under Gu Qianzhou's care; while he continued to commit crimes in the dark, killing crazily, living in the fear that his identity would be exposed at any time.
Concept: In human nature, there are no absolute innocents and no absolute redeemers.