How many movies have Johnny Lam Ming-Yiu and Lai Siu-Man acted in together?

They have worked on 2 movies together! Their first movie together was Beast Stalker (2008) while their highest rated movie together was Overheard (2009). They have not worked together since Overheard (2009).

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Doctor
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Investigator, Intelligence Bureau
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Organized Crime & Triad Bureau Officer
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Drug Dealer