In the winter of her thirty-second year, Heejae's husband's mistress became pregnant. Overwhelmed by shock, Heejae suffered a stillbirth, losing the child she had conceived after a decade with her unfaithful husband. "I will never love you, even if I die... even if I'm reborn." She jumped off the rooftop of her husband's company, and when she opened her eyes, she had returned ten years to the past – to before she met Baek Doyoung, that man. With nothing left but the desire for revenge for her tragically lost child, Heejae heads to a blind date, intent on personally ruining Doyoung's life. However... Doyoung's actions are strangely different from the past, giving her an unfamiliar feeling. A scar on his wrist that the Doyoung she knew didn't have, a face identical to his, yet a gentle demeanor – everything about him is entirely unfamiliar. "Who... who exactly is this man?"