How many movies have Carina Lau and Edison Chen acted in together?

They have worked on 5 movies together! Their first movie together was 1:99 Shorts (2003) while their highest rated movie together was Infernal Affairs Trilogy (Chronological Edition) (2006). They have not worked together since Infernal Affairs Trilogy (Chronological Edition) (2006). They are most known for their drama films together.