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Full-time assassin Ah Qi (starred by Julian Cheung) is back. This time, he receives a mission to kill Fa’s new girlfriend. At lightning speed, Ah Qi shoots Fa and jumps into the sea with his girlfriend to escape. Desperate, Ah Qi rushes to Taiwan and goes to his friend Xiao Gui who is now enchanted by Zhiling. In order to redeem her, Xiao Gui doesn't hesitate to kill. The appearance of Ah Qi makes Zhiling, who has always looked down upon Xiao Gui, colder to Xiao Gui. Xiao Gui's blood boils with indignation and he completes the task with Ah Qi, but what awaits them afterwards is the precarious brotherhood......