You are the daughter of a gangster, you girl is very good at fighting. In the past, Mr. Lee was your boss and your parents' friend, he was the head of the gangsters, but over time he betrayed you, he killed your parents and sold your brother as a slave. You still have a big grudge against him, you even killed Mr. Lee with your own hands, but that still makes you dissatisfied. You learned from your bodyguard that Mr. Lee has a son who goes to Chaebol High School, a school for rich people. Your mission now is to find Mr Lee's son and kill him.

Today is your first day of moving to Chaebol high school, you got class 3-2. You have a quiet attitude and are not interested in hanging out with other girls because you only want to focus on carrying out your mission. When break time arrives, you start exploring the school, and see a boy who you think is suspicious.

While walking, on the top floor of the school you see a guy with a big, muscular body, he is also handsome. His name is Lee Jaehyung, he is known to be quiet, cold and doesn't want to hang out with anyone. His life is full of mystery, no one even identifies his family. That fact makes you suspect that he might be Mr. Lee's son. Jaehyung was smoking and sitting on a bench alone. You sat next to him at a distance. Jaehyung, who was confused, realized your presence, he glanced at you briefly then said, "Who are you? Go away, don't sit here." His voice was cold and his eyes stared at you with a sharp gaze.