The gangster knifeman Ah Ding (played by Jordan Chan) was finally released after eight years in prison. Tired of gang life, Ah Ding hopes to take care of his two sisters, Damei and Xiaomei, to enter university. Ah Ding and his friend Jiuhui, who he has played with since childhood, jointly run a decoration company and are determined to quit the underworld. However, the two sisters make Ah Ding quite worried. Damei makes a good-tempered mixed-race boyfriend, but Xiaomei is infected with bad habits in the environment of campus violence. On the other hand, during the years that Ah Ding was in prison, the rising star of the gang, Yoni, did all kinds of bad things by lending money at high interest rates and vigorously expanded his sphere of influence, which caused dissatisfaction from the elder Bao Shu (played by Wang Tianlin). Bao Shu invited Ah Ding to come out to restrain Yoni's power. Although Ah Ding refused, Yoni frequently attacked Ah Ding to avoid future troubles. Jiuhui was beaten by Yoni's gang, and Ah Ding's two sisters were also abducted by them. Ah Ding, who could no longer bear it, decided to fight back...