无间道Mou gaan dou
Director: Wai-keung Lau
              Alan Mak
Actor：
Andy Lau .... Lau Kin Ming
Tony Leung Chiu Wai .... Chan Wing Yan
Anthony Wong Chau-Sang .... SP Wong
Eric Tsang .... Sam
Kelly Chen .... Dr Lee Sum Yee
Sammi Cheng .... Mary
Edison Chen .... Young Lau Kin Ming
Shawn Yue .... Young Chan Wing Yan

Genres: Crime - Drama - Romance – Thriller
Release Date: 12 December 2002 (Hong Kong)

Description /Synopsis:
Infernal Affairs focuses on a police officer named Chan Wing-Yan (Tony Leung Chiu-Wai), who goes deep undercover into the Triad society, and Triad member Lau Kin-Ming (Andy Lau Tak-Wah), who infiltrates the police department. Each mole was planted by the rival organization to gain an advantage in intelligence over the other side. The more the moles become involved in their undercover lives, the more issues they have to cope with.

Review:
A brilliant cop movie out of Hong Kong, with a sublime plot and great acting by the two leads Andy Lau and Tony Leung (an indescribably great actor). An amazing concept with Lau as an undercover Triad member in the police force and Leung as an undercover cop in the Triad... which leads to many interesting situations. Great stuff, and the DVD even has the alternative ending (which isn't nearly as good as the main one).