How many movies have Andrew Lau Wai-Keung and Halina Tam Siu-Wan collaborated on?

They have worked on 3 movies together! Their first movie together was Young and Dangerous 2 (1996) while their highest rated movie together was Young and Dangerous 3 (1996). They have not worked together since Dance of a Dream (2001). They are most known for their crime films together.