How many movies have Cash Chin Man-Kei and Samuel Leung Cheuk-Moon collaborated on?

They have worked on 5 movies together! Their first movie together was The Fruit is Ripe 3 (1999) while their highest rated movie together was The Forbidden Legend: Sex & Chopsticks 2 (2009). They have not worked together since The 33D Invader (2011). They are most known for their romance films together.