How many movies have Ben Ng Ngai-Cheung and Billy Tang Hin-Shing collaborated on?

They have worked on 7 movies together! Their first movie together was Hong Kong Criminal Archives - Gang AK47 (1992) while their highest rated movie together was Sexy and Dangerous (1996). They have not worked together since The Legend of Lu Xiaofeng 6 (2007). They are most known for their crime films together.