Veteran Korean language teacher Seo Hye-jin’s stable and pressure-free life is unsettled by the return of her former pupil, the one-time troublemaker Lee Jun-ho. A decade ago, she helped him gain admission to a prestigious university. He secretly fell for her then, and has admired her from afar ever since. In the pursuit of love, he gives up his job at a major company to become a Korean language teacher – and be closer to Hye-jin again. Will his plan work? And could this former teacher and student find love?