A high school girl named Young Hae gets braces and also something called an "Expander". Because of the Expander, she is unable to speak properly and speaks with a lisp. When she comes to school the next day after getting braces, people at school including her friends make fun of her and because of that she always tries to keep hidden from everyone to help hide the embarrassment. But then little does she know she meets a boy that starts to like her for her personality, not what she looks like.