Liu was born in Hong Kong with family roots in Shunde, Guangdong, China. He joined TVB in 1977. In the firm The Good, The Bad And The Ugly , he acted as a new immigrant from Mainland China called Ar Chan, so he got the nickname of Ar Chan from that moment. Also, Ar Chan became a popular name to represent new immigrants coming from Mainland between the 1970s and 1990s in Hong Kong.
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Source: Wikipedia