Dae-jin, who was tutored by Min-young, Soo-jin’s junior, because she made a speech mistake with her college junior, Su-jin, hurts her pride that Dae-jin is being tutored by her younger brother for a long time. Dae-jin reveals this to his close junior, Soo-jin’s classmate, Min-ho. In fact, Minho is Sujin’s ex-boyfriend.