ANY KDRAMA WHERE THERE IS ACTION LIKE THE K2 OR THERE IS ON GUY WHO IS BEAT UP OTHERS. HAVE WATCHED CITY HUNTER, HEALER AND SWDBS,.

I haven't seen it..but IRIS: http://mydramalist.com/47-iris 
Maybe try Warrior Baek Dong Soo.....i see u like Ji Chang Wook... he happens to be in it 
Lookout is a must watch.
I second Lookout

Criminal Minds (Korean version)
Cruel City
Duel
The Man from Nowhere (movie)

Most recent I've watched that I also recommend

Confidential Assignment ( 2017 movie)

The King's Woman (CDrama)