Kevin is a freshman at Seoul International High School.

He is 16 years old

He is a kind hearted boy who loves his little sister, Ailee, and would rather die than see her get hurt.

His parents are filthy gazillionares and he hates it.  Everytime, well, every chance they get, they would leave him alone for about a year with his little sister, though he does not mind taking care of, it just seems like their parents are doing that on purpose, and he hates them for that. There are times he thinks he and his sister weren't even there real children, and Ailee hates them for that. And of course, there's always a mountain load of money on the living room table.

He's very shy, but let some one even think about causing harm to Ailee. That shyness will be blown out the window. Yeah, he knows she's a 15 year old girl going to the same school he's going to, and that she can take care of herself, but he can't help it. She's basically all he's got, since their parents are almost always never around. He may seem selfish, but that's his sister, what do people expect?

Hyunshik is a junior at Seoul International High School.

He is also 16 years old.

He's labeled as the school's bad boy for his cold aura by the student body.

He is very out spoken, but only to his psychiatrist Lee Jungsu, who also goes by Leeteuk, and his best friend since birth and also housemate, Dongjun.

He thinks no one else can see through his facade, but when the freshman everyone has been talking about steps in, he doesn't realize that he would change his life forever.