Bizarre cases occur one after another in the bustling city, and the victims seem to have no connection with each other. However, with the in-depth investigation of Song Yiran, the captain of the criminal police team, and Gu Yan, the criminal psychology professor, a secret that has been hidden for many years gradually comes to light. Multiple story lines are intertwined, revealing the complexity and darkness of human nature, as well as the social problems hidden behind evil. In the process of pursuing the truth, the criminal police team led by Song Yiran not only had to face cunning criminals, but also faced pressure and challenges from within. As the case continues to deepen, Song Yiran finds that she has also been involved in a well-planned conspiracy. She must find the real murderer hidden in the darkness and uncover the mystery of her life experience before the truth is revealed.
