Su Nian, the fourth-generation inheritor of Su's Bakery, fights against Haoyue executive Lu Hongyuan to uphold her grandfather's ancestral precept. The ancestral precept states that every Mid-Autumn Festival, the first batch of mooncakes must be given to those who need them most, free of charge. After acquiring the bakery, Lu Hongyuan abolishes the ancestral precept, and Su Nian is driven out of the shop to set up a street stall. She initiates a hundred-person mooncake-making campaign, using the ancestral precept to awaken people's hearts. On Mid-Autumn Festival day, Haoyue mooncakes are returned, and Lu Hongyuan tastes Su Nian's mooncake, remembering that he ate Su's free mooncakes thirty years ago. He withdraws the acquisition, the Su's signboard returns, and the ancestral precept is written into the contract. Heritage lies not in the recipe, but in people's hearts.