Back in high school, Park Haneul was the object of everyone's affection, the popular girl who captivated hearts. Yoo Jung-in dedicated himself to his studies in pursuit of becoming someone worthy of dating her. However, life had a different plan as Haneul married another man. Now, Jung-in finds himself working at a guesthouse, surrounded by bittersweet memories that refuse to fade away. But then, out of nowhere, a familiar face reappears and asks to stay at the guesthouse. Will this unexpected reunion reignite old flames or open doors to new possibilities?