PLOT: Park Han Byul was plain 24 year old living a cheap life.  All she cared about was money and money and money.  Though she was slightly boy crazy as well... Anyway, she was a strong girl, black belt in taekwondo, and also very innocent and pure.  Through the pain and suffering shes handled throughout her years, she still smiles brightly.  She has her set of moral values and doesnt ever break a promise.  So yes, she may be materialistic, boy crazy, etc. but she is the most innocent, pure, strong 24 year old girl you'll ever meet.

Choi Dong Wook was, in short, a playboy and womanizer, at the age of 25 years old.  His parents lived in America and he lived in Korea.  He loved woman but never really wanted to commit to a real relationship.  In that way, he's broken many hearts who are still going after him.  He is the opposite from Han Byul and Han Byul is the total opposite from his "style".  But when he happens to choose Han Byul as his next victim, he realizes she is completely different from her exterior.