Chae Min Seo ( you) is the least popular girl in her high school and she never tries to her best to be liked anymore.  Often called by names, like dandruff, loser, pig and ugly. Even on certains days, she is just invisiable.

DaeHyun is the most cutest guy in high school also known as the idol singer from their school and Chae min's childhood crush. But Daehyun doesn't remember her now, he only remembers playing with a girl when he was young, his childhood crush. Which happens to be Chae Min... 

These two, both have a talent for singing but also having perfect pitch at the same time is rare. But Chae min doesn't know she posses such a gift.