BoA Kwon: a poor but smart girl. She is admitted into an international school where only rich kids go. She received many scholaship which allow her to go to school despite her family economics’ condition. Because both of her parents have run away, she has no choice to take care of his younger brother, Donghae and to have 2 part-time jobs. She is determined, upright and sometimes stubborn. Her wish is to become a doctor.

F4: the richest and most handsome guy in the school. If they want you out of school,of course they can do it without getting in problem. But what will happen when a poor girl gets into their social life and she refuse to leave?

Yunho: The leader of F4. Not into girls, bad at school, arrogant, thinks he is the best.

Jaejoong: The flower boy of the group. Sweet, quiet and not over his ex-girlfriend.

Junsu: The playful one.For him, the most important in life is to have fun.

Yoochun: The playboy.

Changmin: Junsu younger brother. He goes to the same school but he is not considered as F4 because he is naïve, kind and really different from them. He is kinda like the new kid in the next neighbourhood.