Li Yu, a third-year university student, unexpectedly receives a call for help from his niece, Tangtang. Learning that his older sister has passed away and the child has no one to care for her, he resolutely takes on the responsibility of raising her. After binding to a devoted-uncle system, he obtains legal guardianship through proper channels and settles into a new home with a system-rewarded apartment and a street-side snack shop. While making a living selling traditional tea eggs, he carefully looks after Tangtang and helps her adjust to kindergarten. With the companionship of a warmhearted kindergarten teacher and his helpful roommates, uncle and niece heal each other through the rhythms of everyday life and gradually build a warm little home of their own.