How many movies have Anthony Wong Chau-Sang and Ng Man-Ching collaborated on?

They have worked on 5 movies together! Their first movie together was 3 Days of a Blind Girl (1993) while their highest rated movie together was Infernal Affairs II (2003). They have not worked together since Legend of the Fist: The Return of Chen Zhen (2010). They are most known for their action films together.