Boon bin ling (Half Twin) (2006)

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Rich girl Lok Yan and her fiancee Ko Fung come to Hong Kong to meet her poor elder twin sister Lok Ling. The twins haven't seen each other for 20 years. Ko Fung incites Yan's twin sister Ling, a simple-minded and hot-tempered girl, to kill her Yan to obtain her status, wealth and security.