How many movies have Emily Kwan Bo-Wai and Kenneth Lau Hau-Wai collaborated on?

They have worked on 5 movies together! Their first movie together was Troublesome Night 4 (1998) while their highest rated movie together was The Untold Story 3 (1999). They have not worked together since The Legend of Ghost Festival (2003). They are most known for their horror films together.