JSA was a great movie and I agree with both Bob and Lauren about the subtle humor throughout it, and I must say that there was indeed some funny scenes. Surprisingly, however, the whole "good guy (South)" versus "bad guy (North)" scenerio did not exist. Rather, the movie illustrated a sense of resentment toward the US about the division in the Korean peninsula.
In my opinion, the most significant aspect of the movie thus far was the brotherly bond between the four main characters in JSA amidst the battles between the North and South, which effectively depicted the situation in the Korean peninsula as a disappointing and rather depressing issue.
In any event, I hope to watch the rest of the movie because I enjoyed it just as much as everyone else did.