Two feuding members of the same gang are arrested after a fight with another gang and must stick together while serving time in a juvenile prison.

Louis Koo
as Ah Sam

Simon Lui Yu-yeung
as Wah Sir

Frankie Ng Chi-hung
as

Oscar Leung Lit-wai
as

Keith Ng Shui-ting
as Cheung Sir

Lily Chung Suk-wai
as Mother

Michael Tse Tin-wah
as Fat B

Victor Hon Kwan
as

Cheung King-Yip
as Juvenile offender

Joe Cheung Tung-Cho
as