Jin Haru has been harboring a one-sided crush on Jeon Se-gye, her childhood friend of nine years, for all those years. However, Se-gye ignores Haru's feelings, believing that love is an emotion that never lasts. Despite this, Haru cannot give up on Se-gye. Then one day, Se-gye begins to confront the emotions he has tried so hard to brush aside, bringing a shifting change to their relationship.