How many movies have Cash Chin Man-Kei and Frankie Ng Chi-Hung collaborated on?

They have worked on 6 movies together! Their first movie together was 1941 Hong Kong on Fire (1994) while their highest rated movie together was Full Alert (1997). They have not worked together since The Forbidden Legend: Sex & Chopsticks 2 (2009). They are most known for their drama films together.