Her name was Lee Haru. She was one of the quiet ones in school, sat at the front, always did her work but never talked. His name was Oh Sehun, spoiled, cruel, always got what he wanted. She planned to stay invisible in school until graduation, and then quietly take over her parents' restaurant. He had great things planned for his life: bring down everyone who he finds a nuisance at school, take over his father's multi-billion-won enterprises, marry a super-y supermodel, maybe have a few extramarital affairs on the side.

Unfortunately, something happened to change both their plans: she accidentally rubbed shoulders with him as she passed him in the halls.

And now he's determined to make her life hell.