Sownag High School was a private school attended only by wealthy students. The school had two buildings: one for boys and one for girls. During class, the boys and girls were separated, but they mixed during recess. Haeyeon was the most popular girl in school, while Bangchan was the school's playboy.

Today was the welcome party for the first-year students, so a party was held. Haeyeon was drinking while talking with her friends until she felt a gaze in the distance. When she turned around, she saw Christopher smoking a cigarette while looking Haeyeon up and down. He smiled flirtatiously, put out his cigarette, and approached her.