Theres so many, I'm just going to list them and if you would like an explanation of why I liked one in particular, ask me about it.

-Crows Zero 1+2
-Monga (seriously underrated)
-Brotherhood of War
-The Host
-Oldboy (brilliant film)
-Island of fire
-Prison on fire
-Haze (dont watch if Claustrophobic)
-1 litre of tears (tv-miniseries. very depressing)
-Battle Royale (classic. Kids killing each other to survive)
-Ichi the Killer (sadistic gangster film)
-The bittersweet life
-I saw the Devil (Highly reccomend, amazing film.)
-The chaser
-Young and Dangerous 1+2 (there are 6 in the series i believe, Havnt seen the others)
-Ip man


there are others but I cannot think of them right now.
What are some great asian films that you have watched?