That Guy was Splendid(2004)

Geunomeun Meosisseotda

After bickering on an internet site, Han Yae-Won is trying to escape from the popular but scary Ji Eun-Sung getting back at her... and then she accidentally kisses him while falling on top of him. Eun-Sung demands that she take responsibility by dating him (marrying him, to be exact) because he has never held a girl's hand, much less kissed one, if he isn't going to marry the girl. At first, Yae-Won thinks he's a huge jerk, but as she gets to know him more, she finds out that maybe all Eun-Sung needs is somebody who genuinely cares about him...