How many movies have Andy Lau Tak-Wah and Nicola Cheung Sun-Yuet acted in together?

They have worked on 3 movies together! Their first movie together was Cause We Are So Young (1997) while their highest rated movie together was Wait 'Til You're Older (2005). They have not worked together since Wait 'Til You're Older (2005). They are most known for their comedy films together.