Hi guys, does anyone know any dramas where the husband  or ex boyfriend is trying to win his wife or ex girlfriend back? I don't know why, but I am randomly in the mode for that kind of drama. :)

I second Panda's recs.  Also, this thread:

http://mydramalist.com/discussions/recommendation-forum/28202-dramas-where-main-couple-meet-again-and-get-together
Yup, Panda said it! Cunning Single Lady and Emergency Couple for sure! Especially Emergency Couple. 
Autumn's Concerto
Doctors (not really what you wanted...but the couple meet each other again years later)

If you don't mind movies as well :)...
All About My Wife
Virgin Snow
Catch Me