You are a transfer student from Busan,You are a smart girl, diligent, disciplined, crazy about studying...but when moving to a Seoul school  you are in the same class as Jeongwoo, he is a student who is always ranked first in school, no one beats him. but during the midterm exam, you managed to beat him.. you ranked first, with Jeongwoo's childish attitude.. he started to take revenge, until we became rivals