I love melodrama! I'm looking for something else to hold me.  I just got finished watching queen of ambition.  It is not only the best revenge drama I've seen,  but it is in my top three. I'm trying new styles at this point.  I just keep picking up dramas and leaving them.  Right now I'm trying city hunter,  empress kI and masters son. I like my actors to be on the mature side.  Usually over the age of 30. Is anyone else like this and can help? !

I'm currently watching Giant and that's considered one of the best revenge/thriller K-dramas around. It has some melo moments too. I'm enjoying it immensely so maybe you can give it a try :) 

http://www.mydramalist.com/365-giant


Thanks everyone!!!!!! Going to look into ALL of these! !!!
Some revenge ones I like are:
Bad Guy
Shark
Ghost

Overall some good ones I've seen and you might like (and I recommend ;D)
I Hear Your Voice
It's Okay, That's Love
You Who Came From The Stars

(IDK if you've watched them, sorry for that :$)