Ajie (Andy Lau), a gangster in Mongkok, Kowloon District, Hong Kong, is neat and righteous, and has a boss style. In order to take care of his younger brother Wuying (Jacky Cheung), who is impulsive and good at saving face, he keeps dealing with all kinds of troubles, big and small, and even does not hesitate to make enemies with the underworld ruthless character (Alex Man) for Wuying. Ajie's cousin A'e (Maggie Cheung) came to Mongkok for medical treatment and stayed at his house temporarily. The two gradually fell in love with each other, but because he was worried that his identity would eventually hurt A'e, Ajie chose to bury his thoughts. When Ajie understood the truth and couldn't help but want to resist fate, Wuying was once again in danger of his life because of his good face, so the problem of choosing between friendship and love was once again placed in front of Ajie.