Sean Lau Ching-Wan
Inspector Chan Kwai Bun

Andy On
Inspector Ho Ka-on

Gordon Lam Ka-Tung
Ko Chi Wai

Kelly Lin Hsi-Lei
May Cheung

Karen Lee Choi-Ling
Gigi

Joseph Lee Kwok-Lun
Wong Kwok Chu

Eddie Cheung Siu-Fai
Violent Man - Ko's Inner Personality

Lam Suet
Fatso - Ko's Inner Personality

Jay Lau Kam-Ling
Calculating Woman - Ko's Inner Personality

Lu Ching-Ting
Ko's Inner Personality

Chiu Chi-Shing
Ko's Inner Personality

Hung Wai-Leung
Ko's Inner Personality

Flora Chan Wai-Shan
May Cheung in Bun's Eyes

Jonathan Lee Yat-Sing
Weak Boy - Ho's Inner Personality

Jo Kok Cho-Lam
Schemy Woman - Ho's Inner Personality

Eddy Ko Hung
The Chief

Yuen Ling-To
Policeman

Jimmy Wong
Restaurant Manager

Ronald Yan Mau-Keung
Chi-Wai's Boss

Jackson Ha Chak-Shun
Ko's Colleague

Singh Hartihan Bitto
Naresh Sharma

Wong Shiu-Keung
Policeman (uncredited)

Lui Siu-Ming
Mahjong Parlour's Staff (uncredited)

Mark Cheung Yiu-Fai
Mahjong Parlour Customer (uncredited)

Cheang Pou-Soi
Inspector Ho Ka-on (voice)

Florence Kwok Siu-Wan
May Cheung (voice)

Peter Chan Bei-Dak
Cameo (picture in police file)