After being dumped by his girlfriend who called their night together awful, Seongho jokingly decides to take private lessons to improve his physical intimacy skills—only to find out that his tutor is a man. As the lessons progress, what started as a simple lesson slowly turns into something much more intimate between the two.
Min-hyuk accepts a private tutoring job, but as the lessons continue, he begins to notice something unusual about his student, Kyung-won. Not only does Kyung-won seem to know intimate details about his life, but it also feels as though he deliberately approached him. As suspicion grows, Min-hyuk starts investigating Kyung-won's true identity. Yet the deeper they become entangled in each other's secrets, the more their relationship slips into dangerous and uncontrollable attraction.