I've had this one sitting in my Netflix queue for awhile - I didn't realize it was directed by the same guy who made The Yellow Sea (which, I agree, is a fantastic film).
Since you say you're a Korean film fan, I assume you're familiar with the films of Jee-Woon Kim (I Saw the Devil, A Tale of Two Sisters, A Bittersweet Life, etc) and Chan-Wook Park (Vengeance Trilogy, Oldboy, Thirst, etc), but if not, you would probably love their entire filmographies. Also check out the films of Joon-Ho Bong, Ki-Duk Kim, and Chang-Dong Lee if you're interested in the comedic/dramatic side of Korean cinema. Joon-Ho Bong's 'Mother' and 'Barking Dogs Never Bite' are probably still on Netflix, but you'd probably need to pirate films from the other two directors I mentioned.