A man accidentally loses his memory, with his mind remaining in his youth. When he wakes up, he is shocked to discover that he has long been married and has a three-year-old daughter. The past alienation and cold neglect have left his wife and daughter full of anxiety. Carrying sincere apologies, he learns to shoulder the responsibilities of a husband and a father, earnestly making up for past debts, dissolving barriers in the little details of their days, and using sincerity and responsibility to retake the warmth and completeness of a family.