After solving 37 unsolved cases, former criminal police captain Xie Yan was designed by the real murderer to fake his death in an "accidental" car accident. Reborn five years ago when a key case broke out, he restarted the investigation as a "new detective" based on the details of the murder, the characteristics of the murderer, and the location of key evidence in his memory of his previous life. While using precise reasoning to intimidate criminals, he protects Gu Qingci, a history lecturer who was killed due to his own negligence in his previous life. In the process of solving the serial murder case, he gradually uncovers the betrayal network behind the "car accident" - the most trusted apprentice is actually the real murderer's pawn, the most respected forensic doctor hides secrets, and all the conspiracies point to the unsolved case twenty years ago.
