He Was Cool (2004)

When high school girl Han Ye-won (Jeong Da-bin) finds an offensive note on the internet school board left by arrogant Ji Eun-seong (Song Seung-heon) from vocational school, she replies even more offensively. She doesn't know he's hot-tempered and well-known as a bully. So when Ji Eun Song starts looking for her to teach her a lesson, Han Ye Won realizes how big her mistake was...