Kdrama suggestions

Where ml is jerk who breaks fl heart...or hurts her...later grovels...

Reason can be

1 He hates her

2 He likes someone else

3 Anything but NO NOBLE IDIOCY please

#ml has character development  #Happy ending

Thank you in advance

 Goleft:

Bad guy (2010).  -He breaks fl lead's heart because he's following a plan to take revenge on a powerful family

New tales of Gisaeng (2011). - In the first episodes he is rude to female lead and also dump her breaking her heart;  the remaining episodes are about him asking her for forgiveness 

They are both old, so I don't know if you can like it or not.

Are they worth to watch?

 Goleft:

New tales of Gisaeng can be draggy at some point (it's a family drama, 50+ more episodes)

Bad guy it's more approachable, but If I remember well (I watched a long time ago) there is not a good ending

I would say, just give it a try if you don't have something else to watch.

Sure

 Gatcha:

I have a lover 

Jealousy incarnate 

Que sera sera 

Hey thanks I will try que sera sera