Mad Detective— Full Cast

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