Age of youth season 1(the girl loves him very much but the guy is such a jerk)
Kimi ga Kokoro ni Sumitsuita(this one is a good drama the guy here is ill minded and because of this his gf leaves him but after fews years he is back in her life and haunts her for leaving him)
One more time or the day after we broke up (its a web drama starring infinite L And yoon so hee this pretty much fits your description )