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Wise 9-year-old Little Cheung (Yiu Yuet-ming) often spends time with his mahjong-loving grandmother (Chu Sun-yau) and works as a delivery boy at the restaurant run by his father (Gary Lai). He also befriends Fan (Mak Wai-fan), the daughter of illegal Chinese immigrants. Their days of innocence and simplicity are interrupted, though, as Fan's family is found out and Cheung unexpectedly learns that he has an estranged older brother and immediately sets out on a journey to find his lost sibling.