How many movies have Norman Tsui Siu-Keung and Xu Changchao acted in together?

They have worked on 4 movies together! Their first movie together was 四大名捕之食人梦界 (2019) while their highest rated movie together was Fist of Fury: Soul (2021). They have not worked together since Anecdotes of the Longevity Hill (2022).