Eight months pregnant, Xu Zhitang was entrusted by her husband Zhou Yan to his mother Zhao Meilan for care. After Zhou Yan left on a business trip, Zhao Meilan forced Xu Zhitang to move out of her room in the middle of the night, giving up her place to sister-in-law Zhou Ying who had returned to "confinement". Without a word, Xu Zhitang moved into the five-star hotel under her own name; she is the hidden heiress of Huanyu Group's behind-the-scenes major shareholder, having posed as an ordinary daughter-in-law for years solely to test Zhou Yan's true feelings and protect the child in her womb. Facing the various difficulties created by Zhao Meilan and Zhou Ying, Xu Zhitang was forced into premature labor and hospitalized for emergency treatment. After remote monitoring, Zhou Yan rushed back, announced his matrilocal marriage into the Xu family, changed his surname to Xu, and fulfilled vows for his wife and child.