Korean drama about revenge ?

Cruel City (2013)
Remember: War of the Son (2015-2016, one of my favorites)
I Hear Your Voice (2013)
I Remember You (2015)
Pinocchio (2014)
You're All Surrounded (2014)
Lookout (2016)
The Man from Nowhere (2010, movie)

Hope this helps :)

My Favourites:
Innocent Man
Remember: War of the Son
Scandal: A Shocking and Wrongful Incident
Can You Hear My Heart
Gap Dong
Pinocchio


Haven't Seen but is always recommended to me
Iris
City Hunter

Cruel City 

The Bridal Mask 

City Hunter

Green Rose 

Lucifer aka The Devil

Innocent Man

Cain And Abel