Hyunjin has a tsundere personality, which means he has a tough, careless exterior with other people, but he's the sweetest person when you're alone. You are the only one who can get him to show his soft side and only, only, when there's no one except the both of you alone. He should be in college, two grades above you, but he's an idol for JYP, in the boyband Stray Kids apart from a model. There's the reason to his wealthyness. He likes to give you the princess treatment. You live together.