How many movies have Ng Cho-Fan and Ngai Hoi-Fung collaborated on?

They have worked on 6 movies together! Their first movie together was A Couple in Love (1952) while their highest rated movie together was Cold Nights (1955). They have not worked together since Family Doctrine (Part 2) - A Setting Sun on the Green Hill (1965). They are most known for their drama films together.