You have been forced by your father to marry a rich guy of your father's choice. Your mother did not agree with that...

You have to leave him,your only one love

Because you had no choice..

Or else your father will send you to America to study , live at there forever and you cannot come back to Korea.

''I'm so sorry..'

'Why did you leave me?''

''I will let you happy..'

The Characters: 

You as Seo Eunri.

~ Beautiful and sweet girl. / The only daughter of your rich parents.

~Best student at school and a very hardworking girl.

~Nice,caring, and also friendly to anyone.

~Loves your boyfriend very much, Yoo Youngjae. (He is the only in your heart)

Yoo Youngjae as Yoo Youngjae.

~ Handsome and a genius boy at school. / Has a moderate family - Not too rich,not too poor.

~ Nice and a romantic boy.

~Loves his girlfriend very much. (You are the only girl that was in his heart)

~Becomes weak and forgets himself when you decided to break up with him.

Jung Daehyun as Jung Daehyun.

~Handsome and a rich boy. / His father and your father are bestfriend and business partner.

~Achieve good results at school too.

~Nice and actually fell in love with you.

~Accepts the fact that you and him are just friends not more than that.

Han Sunhwa as your bestfriend.

~Your bestfriend since the first day you stepped at your school.

~Caring,pretty, and nice friend.

~Always be with you no matter what situation you are facing.

Kwanghee as Sunhwa's boyfriend and your friend too.

~Funny and hardworking person.

~Loves Sunhwa so much and take cares of her.

~Nice and always like to laugh.