How many movies have Derek Wan Man-Kit and Lowell Lo Koon-Ting collaborated on?

They have worked on 4 movies together! Their first movie together was It's a Mad, Mad, Mad World II (1988) while their highest rated movie together was Brief Encounter In Shinjuku (1990). They have not worked together since Brief Encounter In Shinjuku (1990). They are most known for their comedy films together.