Roy Chueng Yiu Yeung was so memorable as a sociopathic supervillian in the previous installment of Young and Dangerous that he returns in this outing as a different character. With the don of the Hung Hing group, Chiang Tin-sung, dead, his underlings journey to Thailand to persuade his brother, Tin-yeung (Alex Man Chi-leung), to helm the crime syndicate. Meanwhile, an ambition young gangster, Lui Yiu-yeung (Chueng), from the rival Tung Sing group tries to make a play for the big time by killing his boss and dumping the body in Ho-nam's (Dior Cheng Yee-kin) turf. At the same time, a rift in Ho-nam's long-time friendship with Chicken (Jordan Chan Siu-chun) when the former fails to support the latter's bid for a higher level position. This feud eventually spills over into a showdown with Lui, after that gangster's henchmen kills one of Ho-nam and Chicken's friends. The critically panned Young and Dangerous 5 and Young and Dangerous: the Prequel follow up on this installment.
by Jonathan Crow synopsis