Qiao Xing (played by Moses Chan) and Yan Wu (played by Wayne Lai), one is a god-level killer at the peak of his career, and the other is a down-and-out killer who has lost his glory. The two have a common enemy, and their joint revenge has made them inseparable. The emergence of the "Killer Hunter" threatens the entire killer world. Killers, scavengers, and managers all stepped in to dismantle the crisis. Single mother Xiang Qian (played by Ali Lee) and first-floor Fengjie Shuxian (played by Jiang Meiyi) who are outside the killer world are also involved in the crisis because of their relationship with Qiao Xing and Yan Wu... In order to solve the killer hunter, Qiao Xing caused Yan Wu's daughter to be seriously injured and unconscious. In order to explain to his daughter, Yan Wu must kill Qiao Xing; for Xiang Qian, Qiao Xing must live. The two generations of killer kings finally headed for a showdown with no retreat...