How many movies have Nelson Cheung Hok-Yun and Simon Lui Yu-Yeung acted in together?

They have worked on 5 movies together! Their first movie together was Oh! My Three Guys.... (1994) while their highest rated movie together was All's Well, Ends Well '97 (1997). They have not worked together since Escape from Hong Kong Island (2004). They are most known for their comedy films together.