How many movies have Tony Leung Chiu-wai and Waise Lee Chi-Hung acted in together?

They have worked on 8 movies together! Their first movie together was Bullet in the Head (1990) while their highest rated movie together was Infernal Affairs Trilogy (Chronological Edition) (2006). They have not worked together since Infernal Affairs Trilogy (Chronological Edition) (2006). They are most known for their crime films together.