In Wan Chai, Hong Kong, the proprietress of an electrical appliance store (played by Bao Qijing)'s husband died early. She and her sister raised their son Alai (played by Jacky Cheung) together. But the latter is addicted to detective novels all day long. He is still single at the age of 41 and often talks to his imaginary deceased father. At a blind date, Alai met Ailian (Tang Wei), a saleswoman in a sanitary ware store...