Kei's (Ronald Cheng) eldest sister Yu Chu (Sandra Ng) is a hot-tempered magazine editor and her temperament has left her single all this while. They have a traditional family and one of the rules is that none of the siblings could get married before their eldest sister. In view of this, Kei sort help from the famous "Casanova", Koo Chai (Louis Koo), who is the new journalist in Sandra’s firm to pretend to court his eldest sister and lure her into the mood of love.