I'm looking for kdramas like princess's man,innocent man and joseon gunman....

where the male lead is innocent but knows as Criminal and beause of this he had thrown many hardships ....after long time he comes back to get revenge from ppl who ruin his life...and also there be a romance between lead too...but revenge must be the main plot of drama.

-Incarnation of Money (One of my favorites. The main guy faced many hardships and along the way he was framed. This was definitely about revenge).
-Monster (Same writer as Incarnation of Money. It's about revenge too).
-Giant (pretty old but it's about revenge too and it's from the same writer).
-Defendant (The best recent drama)
Secret
The Full Sun

Sealed with a Kiss
Behind Your Smile

Sorry, the last two dramas are not Korean produced, but they're still revenge themed and would still recommend them, especially the latter.
Secret (2013) - Female character is protagonist
Bad Guy (2010)
Time Between Dog and Wolf (2007)
 
yellow boots aka. (ice adonis) 
secret
incarnation of money
and i'm currently watching monster which is pretty awesome 
cruel city
queen of ambition 
shark: the legend of orpheus 
master: god of noodles 
golden cross
big man
can you hear my heart


Green Rose
Good bye Mr. Black
Queen of Ambition
I think it fits perfectly

another revenge drama: Secret