Where did it all go wrong? The moment I dared to harbor feelings for Goo Je-heon, the one and only son of my benefactor? Or when I gave up my life as a pianist and gave birth to his child alone? Yeon-jae abandoned everything and ran away to raise the child of her first love all by herself. Five years later, her first love reappears before her. Yeon-jae tries to hide the existence of the child, while Je-heon finds himself drawn to her once again. An unfinished relationship begins anew, alongside a child who resembles them both.