How many movies have Ha Chi-Chun and Shing Fui-On acted in together?

They have worked on 4 movies together! Their first movie together was Satanic Crystals (1989) while their highest rated movie together was Fist of Fury 1991 (1991). They have not worked together since Fist of Fury 1991 (1991). They are most known for their action films together.