How many movies have Sean Lau Ching-Wan and Szeto Kam-Yuen collaborated on?

They have worked on 6 movies together! Their first movie together was Too Many Ways to Be No. 1 (1997) while their highest rated movie together was The Longest Nite (1998). They have not worked together since Out of Inferno (2013). They are most known for their crime films together.