The film centralizes on the storyline after Tai Fei (Anthony Wong) obtains branch leader status after Young and Dangerous 4. 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.

• Anthony Wong Chau-Sang
• Teresa Mak Ka-Kei
• Benny Lai Chun
• Alex Lam Chi-Sin
• Maggie Lau Kwan-Yee
• Chiu Lai-Yee
• Samuel Leung Cheuk-Moon
• Chan Nam-Wing