A baby swap twenty years ago exchanged the fates of Mara Grove from Qiao Village and Zara Grove, the Gu family heiress. Mara returns to the Gu household, facing family prejudice. She uses patience to reach Zara, closed off due to autism and trauma. Mara returns to her hometown; Zara and her brother follow. Mara helps the Gu family see her in a new light and listen to Zara. The girls protect each other, bringing their parents together, and redefining family.