Jae-ho, who inherited his late father's elite company, hires Hyeon-jeong to help his younger brother Sang-ho, who has been retaking the college entrance exam for nine times, on his studies. However, during the study sessions, Sang-ho is only filled with thoughts of having sex with his private tutor. Meanwhile, Jae-ho, who has secretly loved Hyeon-jeong for a long time, confesses his feelings to her, and the two officially become lovers. But one day, Hyeon-jeong is betrayed by her friend Na-hee, whom she brought in to help tutor Sang-ho in English.