Ah Jie (Andy Lau), a gangster in Mong Kok in Kowloon District, Hong Kong, does things quickly and with affection, and has the demeanor of a boss. In order to take care of his younger brother Wu Fei (Jacky Cheung), who is impulsive and good for his face, he keeps dealing with various troubles, even at the expense of Wu Fei and the gangster (Wan Ziliang). Ah Jie's cousin Ah E (Zhang Manyu) came to Mong Kok to see a doctor and stayed at his home. The two slowly developed feelings for each other, but because they were worried that his identity would eventually bring harm to Ah E, Ah Jie chose to bury his thoughts. When Ajie understood that the true feelings could not be suppressed and wanted to resist fate, Wufei again...