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.
| Actor | Role |
|---|---|
 Sandra Ng Kwan-YuSister Thirteen | Sister Thirteen |
 Kristy Yang GongruCheung May Yun | Cheung May Yun |
 Shu QiScarface | Scarface |
 Alex Fong Chung-SunCoke | Coke |
 Vincent Wan Yeung-MingHon Ben | Hon Ben |
 Richard Ng Man-TatTat | Tat |
 John Ching TungSalty | Salty |
 Chik King-ManSasa | Sasa |
 Kwan Hoi-SanUncle Pun | Uncle Pun |
| JJimmy Wong Ga-LokJames | James |
 Peter Ngor Chi-KwanRun Fa-Fit | Run Fa-Fit |
 Kam Hing-YinPanther | Panther |
 Ken Lo Wai-KwongThe Prince | The Prince |
 Andy Lee Do-YueChan Yiu | Chan Yiu |
 Frankie Ng Chi-HungBrother B | Brother B |
 Raven Choi Yip-SanBrother San | Brother San |
 Lee Siu-KayBrother Kei | Brother Kei |
 Francis Ng Chun-YuUgly Kwan | Ugly Kwan |
 Ekin Cheng Yee-KinChan Ho-Nam | Chan Ho-Nam |
 Jerry Lamb Hiu-FungForeskin | Foreskin |
 Jason Chu Wing-TongBanana Peel | Banana Peel |
 Matt Chow Hoi-KwongEnglish Teacher | English Teacher |
 Bobby Yip Kin-SangEnglish Class Student | English Class Student |
 Ronny Ching Siu-LungNot listed | Not listed |
 Gary Mak Wing-LunDoctor | Doctor |
 Henry Yu YangNot listed | Not listed |
 Soi CheangNot listed | Not listed |