Choi Yumi. She was an ordinary girl like other, doing what she usually does. But then, she met a golden-haired boy with unexpected accident. He was the #1 fighter and unpredictable. Start from it, her life becomes unordinary.

Kai. He was depressed with his life. He thought that nobody loves him. Since his parents divorced, he become cold and likes to fight. Until he met a girl who told him that he's shine like gold and so everyone wants to see him and he's not alone. Since that, he's changed.