Seo Joo Hyun (Seohyun):

Seventeen years-old. Her parents got in a car crash when she was ten, and ever since she has been trying to cope on her own. She has a job at the local bakery, selling pastries for the old lady who runs it. In her spare time, she reads. And reads. And reads. Although she has never had a proper education, she is more intelligent than she should be. She is polite, sweet, shy, and determined to change her way of life. 

Cho Kyuhyun:

Eighteen years-old, and living in the lap of luxury. His father is the head of Cho University, where he attends, while his mother is a highly renowned artist around Seoul. Although Kyuhyun is fawned over by a huge amount of girls at school, he doesn't pay any attention to him. His one and only goal is to please his parents by studying law. He plans on becoming an acclaimed lawyer when he is able to. Thanks to his inability to make decisions for himself, he rebels against his manipulative father, to finally get what he truly wants. 

Kim Ryeowook: 

Kyuhyun's best friend since childhood. He also comes from a prestigious family, but his ego is well-balanced. He knows Kyuhyun better than he even knows himself, and practically serves as his mentor. He is known for his outgoing and friendly personality, surprisingly high grades, and his brotherly relationship with Kyu.