Ten years ago, Gu Chen, the criminal police captain, caused the death of an informant due to an operational error. Since then, he has been nicknamed the "shame of the police community" and has hid in the darkness and become a "scavenger" specializing in gray area matters. Ten years later, a "Rainy Night Butcher" case that imitated the techniques of that year's unsolved cases reappeared, and Jiang Wan, the criminal investigation detachment's new consultant and criminal psychology genius, was forced to join forces with Gu Chen. One believes in procedural justice, and the other is accustomed to using evil to fight evil. In the process of tracking down serial murder cases, the two gradually uncovered a huge black network that has been entrenched in the city for many years.
Gu Chen (attack): 32 years old, former captain of the criminal investigation detachment, now an underground intelligence dealer. He is taciturn, acts ruthlessly, and suffers from severe insomnia and PTSD. His sense of justice was buried deep under the ruins, and only Jiang Wan could awaken it.
Jiang Wang (Shou): 25 years old, criminal psychology consultant who returned from overseas. He looks cool and gentle on the outside, but he is actually very insightful and has "hyperamnesia" that he can never forget. He has only one purpose in returning to China: to find out the truth behind the death of his mentor (that is, Gu Chen's informant).
Purpose: Gu Chen and Jiang Wang join forces to pursue the murderer with different views of justice, complete self-salvation while facing ten years of trauma, and stick to the truth and the light of humanity in the darkness.