You, Kim Hae Ryu is a girl great in martial arts. Name whatever, Kungfu, Muaythai, Taekwondo, Streetfight or whatever, you have learn it since you were eight. 

No one knows how much your ability to fight. They only knew that you are just a fragile little girl just because you are the daughter of the president of Shinje Group except your father and his secretary who knows your true colours and your ability to fight. But still, he still sent 2 bodyguards to guard you everyday,even in school.

In school, you are an ice princess. Every guys wants to get close to you but you ignore them and your bodyguards will always stay by your side.

 After your mother has passed away, you live with your single father, Kim Pil Joong who didn't like you to be so tomboy and knows how to do martial arts. He prefers you to be a graceful girl who knows how to dance gracefully like a swan in a lake.

Because your father are having a headache each day thinking about your rough behaviour, he planned something with his bestfriend without you knowing. What will happen if that idea will make your life upside down? And... What is it that they were planning quietly?