He did Bittersweet Life and Tale of Two Sisters which were both excellent, so I would say you should be pretty safe. Looking to see that one myself.
Just watched it Scott. It's f***ing immense to be honest, one of the best movies I've seen for a while. A really dark, original and incredibly violent take on the serial killer genre, with top notch direction and performances throughout. It also spawns one of the great screen villains in Min-sik Choi (Oldboy) in top form as sadistic murderer Kyung-Chul.
VERY recommended.
Few reviews here