The story tells the story of Xiao Zhan, a prison guard who is thoughtful and ruthless. Because his sister is involved in the underworld dispute, he is forced to step into the gray world he is most familiar with. He has no system and no rebirth. His only weapons are the criminal psychology, fighting skills and bottomless insight into human nature he learned from countless felons. Xiao Zhan used his identity as a prison guard as a cover, used his knowledge of criminals, and reversed operations to subdue the gangsters and consolidate forces step by step. He grew from an unknown law enforcer to an order maker that terrified the entire underground world. The highlight is the protagonist's contradictory identity of "fighting evil with evil" and the extreme game between black and white, showing how an ordinary person can rely on wisdom and courage to build his own underground kingdom step by step without a golden finger.
