How many movies have Kong-Keung Wong and Wan-Choi Wong collaborated on?

They have worked on 4 movies together! Their first movie together was My Better Half (1993) while their highest rated movie together was O.C.T.B. Case - The Floating Body (1995). They have not worked together since O.C.T.B. Case - The Floating Body (1995). They are most known for their crime films together.