Choi Sooyoung is just a kid from the wealthiest family in all of South Korea. Born with a beautiful face and body, she was popular everywhere ; school, works, media, everywhere. 

She's still a good girl who likes to join charity programmes. Her sister, Soojin, died and it's a different story to tell

Cho Kyuhyun was the popular guy at school who loves to bully others. His favorite one to bullied are Ryeowook, Shindong, and Sungmin. She likes to disses teacher and others. A very mean guy who's actually a warm-hearted person . Living in a family like hell which turn him to be a bad one. He sometimes go to help people but no one never know including his family. But one know, Shim Changmin. 

Choikang Changmin or Shim Changmin was just a countryside boy. A simple guy who wore glasses at day and work on his family's farm. Went to Seoul everyday just to study. He often got good grades because he's so thankful to his family. He's not a poor family but not a rich one. The money that his family earned was just enough for their life. But what if the real Shim Changmin was caught up buy the girl named Choi Sooyoung?

Kim Junsu ... his profile would be revealed later in the story ^^ started appearing in the middle though~