The three films, the classic, taut first film, its prequel and a third that fluctuates between the immediate past and the future, revitalized Hong Kong crime drama with bold filmmaking by directors Andrew Lau Wai-keung and Alan Mak, with Mak also writing the scripts with Felix Chong Man-keung.
Source: ‘Infernal Affairs’ tops Hong Kong crime cinema – Knox County VillageSoup