How many movies have Alex Mok Siu-Chung and Anthony Wong Chau-Sang collaborated on?

They have worked on 5 movies together! Their first movie together was Executioners: The Heroic Trio 2 (1993) while their highest rated movie together was 2 Young (2005). They have not worked together since I Corrupt All Cops (2009). They are most known for their action films together.