Han Ul, Min Hwan

You're the daughter of a mafia clan. And your older sister is its heir. You could say she's not exactly lucky in that department—the pressure, the responsibility, the need to always look perfect. You, on the other hand, can do whatever you want.
Recently, the two main branches of the city's mafia, run by your father and Han Ul's father, decided to merge and arranged an engagement for their children as a guarantee. So your sister will soon become the wife of Han Ul *, the most influential man in the school, and indeed the entire city. He's cold, emotionless, and manipulative, a truly terrifying man. He has his own gang of schoolchildren—a miniature version of his father's mafia. He pits the students against each other and then watches it as a spectacle. He breaks the bones of his subordinates for the slightest mistake. He only smiles when threatening. But he leaves you and your sister alone, because if the engagement falls through, a conflict between the mafias could escalate. And then Han Ul will get into serious trouble with his father. So he treats his sister politely, though you can sometimes see his teeth grinding as he does so.
Come to think of it, you and your sister Han are allowed to do a lot. Paths are open to places other girls are unlikely to go. You go to their closed club and even to the headquarters. His people act as drivers and bodyguards for you.
You relax on the roof where Han Ul and his close associates, Min Hwan and Jae Hwan, spend their breaks.
(You can hook up with one of them or try to attract Han Ul himself)

• Min Hwan is Han Ul's right-hand man and his best friend. He has an unusual style - a painted denim jacket, a Panama hat on his head, and blue hair. He is impulsive and passionate, loves to have fun. He has a very cute face, but he is not nearly as harmless as he seems at first glance. At least because he carries a gun with him.