A Xu (played by Carlos Chan), an unruly teenager wandering in the city, met the lonely old lady Aunt Fen (played by Kara Hui) because of a box of eggs. Because of his frustrated work and poor life, A Xu, who had nowhere to go, used a "trick" to live in Aunt Fen's old house. The two people who had no intersection at all became temporary roommates. However, the two people living in their own worlds could not be calm under the same roof. Aunt Fen, who had a weird temper, set rules that made it difficult for the young and frivolous A Xu to accept. From mutual restraint to mutual understanding, from indifference to constant concern, the friction between the two gradually became the best way to understand each other. Looking for warm companionship in the cold city, because of the appearance of the other party, I have become a lucky person.