Ok these are variations that have aspects of what you're looking for, some more some less, all of them include a girl that rejects a guy at some point and he doesn't just take it quietly, but keeps on trying or goes mad in one way or another.
The closest one I can think of is School 2017
Empress Ki
Boys Over Flowers
Protect the Boss
Missing You
Cunning Single Lady
Secret Garden
What Happened in Bali
The Heirs