Uncle Man (Yu Ha), a magnate in the gambling industry, is well-known as "the Grandmaster of Kung Fu Mahjong". Having lost his wife in his early years, the widowed father lived with his only son Ken (Roger Kwok). Ken has mastered the art of mahjong and was nicknamed "The Half-Century Man" as he once won 50 hands of mahjong in a roll. Everybody expects Ken to succeed his father as the Grandmasterof Kung Fu Mahjong. Auntie Toni (Qiu Yuen) is the sworn sister of Ken's mother. She treats Ken as her own son.