Mina and Chaeyoung used to be the cutest married couple there is. Until one day an accident happened. Chaeyoung was involve in a fatal car crash. She woke up thinking she is still in her teens. Forgetting she is already married to the love of her life.

Chaeyoung was a delinquent student who always causes trouble, her parents were alway busy at their works and they rarely come home, even if Chaeyoung cause trouble they will just give a call and Chaeyoung mess will be cleaned. One day she met Mina after her fight with the gang leader of the other school because she got stabbed and fainted. When she woke up she was in an unfamiliar room and that moment becomes the turning point of Chaeyoung's life.