Sean Lau Ching-Wan

as Inspector Chan Kwai Bun

Andy On Chi-Kit

as Inspector Ho Ka-on

Gordon Lam Ka-Tung

as Ko Chi Wai

Kelly Lin Hsi-Lei

as May Cheung

Karen Lee Choi-Ling

as Gigi

Joseph Lee Kwok-Lun

as Wong Kwok Chu

Eddie Cheung Siu-Fai

as Violent Man - Ko's Inner Personality

Lam Suet

as Fatso - Ko's Inner Personality

Jay Lau Kam-Ling

as Calculating Woman - Ko's Inner Personality

Jeff Cheung Ka-Kit

as Ko's Inner Personality

Lu Ching-Ting

as Ko's Inner Personality

Chiu Chi-Shing

as Ko's Inner Personality

Hung Wai-Leung

as Ko's Inner Personality

Flora Chan Wai-Shan

as May Cheung in Bun's Eyes

Jonathan Lee Yat-Sing

as Weak Boy - Ho's Inner Personality

Jo Kok Cho-Lam

as Schemy Woman - Ho's Inner Personality

Eddy Ko Hung

as The Chief

Yuen Ling-To

as Policeman

Jimmy Wong

as Restaurant Manager

Ronald Yan Mau-Keung

as Chi-Wai's Boss

Apple Chow Suk-Wai

as 7-11 Worker

Jackson Ha Chak-Shun

as Ko's Colleague

Jack Lai Jan-Lung

as Ko's Colleague

Singh Hartihan Bitto

as Naresh Sharma

Wong Shiu-Keung

as Policeman (uncredited)

Lui Siu-Ming

as Mahjong Parlour's Staff (uncredited)

Mark Cheung Yiu-Fai

as Mahjong Parlour Customer (uncredited)

Soi Cheang

as Inspector Ho Ka-on (voice)

Florence Kwok Siu-Wan

as May Cheung (voice)

Peter Chan Bei-Dak

as Cameo (picture in police file)