Kim is a lonely girl. Prefers to sit alone, without any friends and always made herself sitting at the back of the class. Noone doesn't even cared about her. Yet, she is a daughter of a rich businessman that is well-known there. 

Sungyeol is a popular boy, but her doesn't want that calling. He hates everyone, literally. But, he founds out a girl, iinvincible girl, actually. He was too curious about her, and he decided to investigate her.