After experiencing setbacks in her life, a middle-aged woman bravely turns back time to restart her youth as if she were twenty again.
He Pei Jin is a woman who once had her whole life ahead of her, but she exchanged the best years of her youth and gave up her career to become a model housewife. As her marriage crumbled, she realizes that she is left with nothing. Nevertheless, she doesn't blame nor hate but strives to set her life on the right track to chase after the precious moments that she has lost. She returns to school to become her son's schoolmate and starts anew to fulfill her dreams one at a time.