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Stephen Au Kam-tong (born 26 April 1963) is a Hong Kong actor for TVB (2000–present). He was formerly an actor for ATV (1990–2000). He played David Mo (武紀勇) in TVB sitcom Best Selling Secrets (2007–2008). He also played the role of Yim Yue Dai (閆汝大) in TVB sitcom Off Pedder. Au is also got a black belt in full contact karate. Wikipedia