**"The most perfect performance in this city is sin itself."**
**——When a criminal profiler meets a blood-stained undercover detective, are they chasing the murderer or the ghosts in each other's hearts? **
**Lu Ji** A top criminal psychology expert, so rational that he is almost indifferent. He could see through lies in three seconds, but he could not face the profile of the failure ten years ago - a wrong judgment caused the hostage to die in front of him.
**Cheng Jianwei was a former undercover drug agent and now a criminal police officer in the serious crime team. He walks on the edge of the law, his fists are faster than evidence, and he always wants to fight violence with violence.
When a series of "performance murders" shock the whole city - the victims are actually ordinary people? ? After death, they were placed in a penitent posture, holding the broken string in their hands - Lu Ji and Cheng Jianwei were forced to join the special investigation team.
**"Are you saving me for the case, or for the hand you didn't hold ten years ago?"**
**"This time, I will never let go again"**
And behind the special investigation team, there is always a pair of eyes observing their every move...
Concept: Justice and madness are only separated by a crime scene