Xiaoxiao and her younger foster sister, Huanhuan, swap identities. However, this exchange leads Xiaoxiao's biological parents to mistake Huanhuan for their biological daughter and treat their own flesh and blood as the daughter they adopted. Even Xiaoxiao's biological older brother believes this, constantly misunderstanding and beating Xiaoxiao before sending her to a correctional center. After Xiaoxiao is released, her adoptive father, the richest man in the world, punishes those who bullied her at the center. He treats Xiaoxiao exceptionally well. When Xiaoxiao returns home, she wants to see her grandmother, but her biological parents continue making one mistake after another and ultimately lose Xiaoxiao forever.