Su Ranran accidentally helps Fang Mingyue, who suffers from dementia, but is mistaken for the Gu family's daughter-in-law. To comfort the elderly woman, Gu Luchen proposes a whirlwind marriage to Su Ranran. They both think it is merely a temporary arrangement, but unexpectedly, the young Gu family's little master becomes convinced that Su Ranran is his mother. As they spend time together, Gu Luchen is gradually moved by Su Ranran's kindness, while Su Ranran discovers that her supposedly construction-worker husband is actually a business magnate. Amid a tangle of misunderstandings and revelations, a turbulent romance quietly begins to blossom. However, the mystery surrounding Su Ranran's background and the secrets of the Gu family push their marriage into even more complicated territory.