In a remote village in early 20th century China, a seemingly unremarkable paper mill worker named Liu Jin-Xi becomes an unlikely hero when he foils a robbery by killing two notorious criminals. This act of bravery draws the attention of the detective Xu Bai-Jiu, who is determined to understand how an ordinary man could defeat such dangerous foes. Xu's investigation into Liu's past uncovers inconsistencies and leads him to suspect that Liu might be hiding a dark and complex history. As Xu digs deeper, he becomes convinced that Liu is connected to a feared martial arts clan, suggesting a life steeped in violence and secrecy.

Tensions escalate as Xu's relentless investigation threatens to expose Liu's true identity, leading to a series of confrontations that implicate both men in a deadly game of cat and mouse. Liu struggles to protect his newfound peaceful existence and his family while Xu wrestles with his own moral convictions and the law. The ensuing conflict pits personal redemption against professional duty, setting the stage for a dramatic and climactic resolution where each must face the consequences of their actions.