How many movies have Cash Chin Man-Kei and Serina Hayakawa collaborated on?

They have worked on 2 movies together! Their first movie together was The Forbidden Legend: Sex & Chopsticks (2008) while their highest rated movie together was The Forbidden Legend: Sex & Chopsticks 2 (2009). They have not worked together since The Forbidden Legend: Sex & Chopsticks 2 (2009).