Johnnie To, Ka-Fai Wai	...	(Director)
Ka-Fai Wai, Kin-Yee Au	...	(Writer)
Ching Wan Lau	...	Inspector Chan Kwai Bun (as Lau Ching Wan)
Andy On	...	Inspector Ho Ka On
Ka Tung Lam	...	Ko Chi Wai (as Lam Ka Tung)
Kelly Lin	...	May Cheung
Kwok-Lun Lee	...	Wong Kwok Chu (as Lee Kwok Lun)
Choi-ning Lee	...	Gigi (as Karen Lee)
Flora Chan	...	May Cheung - in Bun's eyes
Siu-Fai Cheung	...	Violent Man - Ko's Inner Personality (as Cheung Siu Fai)
Suet Lam	...	Fatso - Ko's Inner Personality (as Lam Suet)
Jay Lau	...	Calculating Woman - Ko's Inner Personality (as Lau Kam Ling)
Eddy Ko	...	The Chief
Jo Kuk	...	Cunning Woman - Ho's Inner Personality (as Jo Koo)
Ling To Yuen	...	Policeman (as Yuen Ling To)
Jonathan Lee	...	Weak Boy - Ho's Inner Personality
Ronald Yan	...	Chi-Wai's Boss
Siu-keung Cheng	...	Cinematographer

Comments: More impressive stuff from To.

Summary: After a series of crimes committed with a missing cop's gun, a desperate HK detective enlists the aid of a disgraced ex-detective named Bun, who claims to have the ability to see other people's thoughts.

Overview: A missing police pistol is connected to a series of recent heists and murders. Its owner, Wong (Lee Kwok Lun), vanished earlier while pursuing suspects in the bush. His partner, Chi-Wai (Lam Ka Tung), miraculously returned unharmed.

Inspector Ho (Andy On), the man in charge of the investigation, seeks help from his former boss Bun (Lau Ching Wan), who had once been recognized as a gifted criminal profiler until he was being judged crazy years ago. He has the ability to see into a person's inner personality, where the subconscious desires and emotions are laid bare.

After the very first contact with Chi-Wai, Bun concludes that Chi-Wai is the murderer. What begins as a quest for answers has now taken a schizophrenic turn where truth and lies, reality and delusions, intertwine...