Three-year-old Niannian comes with a koi good-luck constitution, smart and transparent, kind-hearted. Due to work pressure and debt problems, her parents send her back to the countryside to be cared for by her grandparents and maternal grandparents. The four elderly people live separated by fields yet are not close. After returning to her hometown, Niannian uses her kindness and transparency to untie the family's estrangement, bringing good luck and blessings to the family.