How many movies have Calvin Poon Yuen-Leung and Ng Kin-Hung collaborated on?

They have worked on 4 movies together! Their first movie together was On the Edge (2006) while their highest rated movie together was Fooling Around Jiang Hu (2016). They have not worked together since Fooling Around Jiang Hu (2016). They are most known for their thriller films together.