Su Wan makes up her mind to go to the civil affairs bureau and process the divorce with her husband Zhou Siye. Who would have thought that on the eve of the divorce, Zhou Siye suffers a lightning strike and a car accident. Surviving this major disaster, his brain is traumatized, and his mind and memory stay in his eighteen-year-old adolescent period, completely not remembering their marriage. The divorce is forced to be shelved, and Su Wan, while dealing with the chaotic and noisy cohabitation daily life, is also working hard on her own career. Two people carrying past scars, in the messy interactions, face each other directly again, unraveling the heavy misunderstandings of the old affection.