During Doyoon's early years, Seohyun, a college student, tutored him for several years, marking the start of Doyoon's first love. However, their communication abruptly ceased without explanation. Years later, they encounter each other again at university, with Doyoon as a student and Seohyun as a professor. Unlike Doyoon, who is excited to reunite, Seohyun maintains a distance. Doyoon senses that there is something different about him. Concurrently, he begins to hear odd rumors about Seohyun from his classmates, igniting Doyoon's fervent quest to connect with Seohyun.