Yeonjun, the charismatic and popular college student, finds himself captivated by Mr. Kang, a charming and handsome transfer teacher. Despite his playful reputation, Yeonjun intentionally lands in after-school detention to be near the object of his affection. Mr. Kang's rumored handsomeness and endearing personality make him the most liked teacher, with whispers of his attractive physique and a mysterious butterfly tattoo adding to his allure.