Kei's (Ronald Cheng) eldest sister Sandra (Sandra Ng) is a hot-tempered magazine editor and her has left her single all this while. One of the family rules isthat none of the siblings could get married before their eldest sister. Kei seeks help from the famous Casanova, Koo Chai (Louis Koo), to pretend to court his eldest sister and lure her into the mood of love. With Sandra falling in love with Koo Chai, he in turn falls in love with another girl, Mun.

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