Can't really envy South Korea. Seems to me they won't start any serious hostilities because they don't have anything to win, yet much to lose. And I'm not even talking about casualties or possibility of the North Koreans starting a guerilla war. In the long run getting rid of a nation like North Korea would probably be the best for all, but it's difficult to justify the price of it with abstract altruistic long term goals.
And it's not like the North wouldn't know this
.