Gu Zhenting is the captain of a criminal police detachment. Because of a midnight butcher case, he encounters Mu Qing, the "illegitimate son" of a nightclub, and then the gears of their fate begin to turn. The contract he made with Black Snake during his lifetime gradually expanded due to his encounter with Mu Qing. Gu Zhenting completed his contract with the black snake in each case and realized the warmth and despicability of human nature.
Concept: The warmth and despicability of human nature