How many movies have Derek Kwok Jing-Hung and Donnie Yen acted in together?

They have worked on 5 movies together! Their first movie together was In the Line of Duty 4 (1989) while their highest rated movie together was Tiger Cage II (1990). They have not worked together since New Kung Fu Cult Master 2 (2022). They are most known for their action films together.