"All we had was a one-night stand—nothing more! Gaeul never expected to sleep with the wrong guy. But the real shock? Her one-night stand turns out to be none other than Seo Dohyeon—her older brother’s boss. Encouraged by a friend to try a casual fling, she takes the leap, never imagining it would spiral into a total disaster. But… was it really a mistake? Dohyeon is handsome, successful, and undeniably skilled in bed. He’s the full package. And if she’s being honest, she doesn’t exactly hate the way he keeps blurring the lines between them. Just when her heart starts to waver, Dohyeon finds out the truth—her real age. And suddenly, he pulls away.