古惑仔外传（系列）

In a triad underworld dominated by men, the film tells the story of how Sister 13 (Sandra Ng) faces the trials and tribulations of rising to become the Hung Hing branch leader of Portland Street, in this first official spin-off movie from the Young & Dangerous Series.

Showcasing the earlier years of Chan Ho Nam and Chicken, this prequel tells of their time during their willingness to follow Hung Hing's Uncle Bee.

Tai Fei discovers he has a son, and soon realizes that he is a triad member involved in the Tung Sing gang which deals in narcotics.

Gang member Chicken is fond of his childhood sweetheart, Gigi, who becomes a nightclub girl to cover her sick mother’s medical costs and is entrusted to him by her dying mother. Chicken plans to send Gigi to live in Macau, yet unexpected hurdles leave their romantic fate unresolved.

Sandra (Sandra Ng) is in for a serious dose of culture shock when she returns from her studies abroad to her home in Macau, where her father is the head of a major network of underground gambling, prostitution, and other assorted super-vices. Sandra's father is putting on the pressure for her to inherit his morally-corrupt throne, but her morals dictate that she have nothing to do with it. However, Sandra's childhood friend Josie (Josie Ho) has gotten herself into serious debt and desperately needs any help Sandra can offer. Will Sandra help her friend at the cost of her own morals? It's now up to her to decide between upholding her own beliefs and making serious ethical sacrifices for the sake of her friend.