I haven’t seen the South Korean film you mention, but if you enjoyed that, you might be interested in some other South Korean movies. I walked into my first South Korean film a couple years ago at the Tokyo International Film Festival not really knowing what to expect, and I came out very impressed. Shortly thereafter, I learned that South Korea has produced numerous excellent films, especially during the last few years. It is really a shame that South Korean cinema does not seem very well known in the West outside of film festivals. I have heard that in South Korea, locally produced films often outsell Hollywood blockbusters, and I can appreciate why. At any rate, here are a few of my recommendations:
Peppermint Candy (Bakha Satang) This is an extremely depressing film, but if you liked Osama , you should be able to handle it. It starts out with a man committing suicide, and then goes back in time and shows all the stressful experiences he had that led him to take his own life. I found it very moving, and was unable to stop thinking about it for a long time after I first saw it.
Oasis Also by the same director and with the same lead actor as the film above, this is a drama/romance about a man who falls in love with a handicapped woman.
Memories of Murder (Salinui Chueok) This is the first South Korean film I saw, and my favorite. It is based on actual events concerning the hunt for South Korea’s first serial killer. It has a great mix of mystery, drama, and surprisingly, comedy.
Finally, there are at least a couple others that I have not seen yet, but I have heard are excellent:
JSA (Gongdong Gyeongbi Guyeok JSA) This is a drama about the tensions on the border between North and South Korea.
Spring, Summer, Fall, Winter… and Spring (Bom Yeoreum Gaeul Gyeoul Geurigo Bom) Said to be a film about the cycle of life, this is a drama that follows the life of an old monk and his young disciple over many seasons.