Modern girl Si Nian accidentally transmigrates into a 1980s book, becoming the fake daughter who was swapped at birth. The marriage that was originally supposed to be undertaken by the real daughter falls on her shoulders, so Si Nian calmly accepts the appointment, marries the practical factory director Zhou Yueshen, and takes over caring for three children who have lost their parents. Facing the moral constraints of her elders, criticisms from outsiders, and harassment from petty people, Si Nian is neither humble nor pushy, managing the household with her skills and cleverness and attentively accompanying the children as they grow. Amidst the smoky, everyday village life, she strives to pursue her own life, studying for exams to enrich herself while slowly getting along with the steady and introverted Zhou Yueshen, hand in hand turning an ordinary little life into a warm and thriving one.