Bun, a schizophrenic, former police inspector comes out of retirement to help a rookie detective solve a complex murder case involving a missing colleague and a suspected policeman suffering from a multiple personality disorder.
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Sean Lau Ching-Wan as Inspector Chan Kwai Bun
Andy On as Inspector Ho Ka-on
Lam Ka-Tung as Ko Chi Wai
Kelly Lin as May Cheung
Lee Kwok-Lun as Wong Kwok Chu
Karen Lee Choi-Ling as Gigi
Flora Chan as May Cheung in Bun's Eyes
Eddie Cheung as Violent Man - Ko's Inner Personality
Lam Suet as Fatso - Ko's Inner Personality
Jay Lau as Calculating Woman - Ko's Inner Personality
Eddy Ko Hung as The Chief
Jo Kuk Cho-Lam as Ho Ka-on's Inner Personality
Jonathan Lee Yat-Sing as Weak Boy - Ho's Inner Personality
Yuen Ling-To as Policeman
Ronald Yan Mau-Keung as Chi-Wai's Boss
Jimmy Wong Wa-Wo as Restaurant Manager
Apple Chow Suk-Wai as 7-11 Worker
Jackson Ha Chak-Shun as Ko's Colleague
Jack Lai as Ko's Colleague
Jeff Cheung Ka-Kit as Ko's Inner Personality
Chiu Chi-Shing as Ko's Inner Personality
Hung Wai-Leung as Ko's Inner Personality
Lu Ching-Ting as Ko's Inner Personality
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)