Anthony Wong Chau-sang
— Inspector Chou Chien
陳捷文
— Inspector Cheng Hui
Maggie Siu
— Inspector An Chi
Eddy Ko Hung
— Mr Hu
羅蘭
— Chien's mother
王龙威
— Sergeant Lei Shen
Law Shu-Kei
— Chien's father
張榮祥
曹眾
Ling-Si Chow
Bo-Law Kei
羅禮賢
李達超
梁啟智
Siu-Wah Mok
譚偉民
鄧超友
John Wakefield
Yeung Wo
Leung Jun-Git
— Cheng Hui (Teen)