Lin Yuan takes over a failing convenience store and accidentally binds with the Ten Thousand Realms system. Every night, the store welcomes guests from other realms. Two-and-a-half-year-old Little Sizi from the Tang Dynasty sweetly calls him Little Brother, and a single word turns Lin Yuan into a child-pampering maniac! He buys winter clothes for Little Sizi, feeds her snacks, and also gets to know A He, a girl from a desolate village. Upon learning that Little Sizi passes away from illness at the age of twelve in historical records, Lin Yuan decides to use modern supplies to defy the heavens and change her fate! A heartwarming and healing daily routine of feeding across ten thousand realms thus unfolds.