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Why do Hong Kong people call people from mainland China who go to Hong Kong A-chan?

Ah Chan was a common name used by Hong Kong people from the 1970s to the 1990s for immigrants from mainland China. It was discriminatory and is rarely used today. This name comes from the title of the TV actor Liu Weixiong in the TV series "The Man in the Internet". In the TV series, A Chan became a sensation because he had to eat 36 burgers in one go. Another name.