The time-honored restaurant Gu Family Feast suddenly sees a management rights adjustment agreement, as relatives join hands to set up a commercial trap in an attempt to swallow the ancestral business. Beneath this property contest, a family background secret dusted for years is also hidden. Relying on key physical evidence such as an old-style recording button and a birth certificate, matched with old items like an old swaddle and a small tin car, the protagonist, with the help of Aunt Fang, Xiao Xu, and Doctor Li, confronts the scheming family elders and the mastermind behind the scenes, peeling back their disguise layer by layer, making a desperate comeback with conclusive evidence, guarding the time-honored brand, and defending family justice.