I once shared a map I had of Korea with a group of Koreans who were working here, they didn't like the bold line that marked the "border" between the North and South, they don't like the idea of the separation being permanent. I got the feeling that this was a very common attitude in Korea, might be the one thing that North and South can agree about.
Unfortunately the cold war tended to harden this unreal border, and the prosperous South is useful to the US and the western world , the crazy North is useful to China in a way that does not need prosperity.
I understand that learning to speak Chinese is a popular study in South Korea, and that many business deals are being crafted between Chinese businesses and S. Korean businesses . What might happen if South Korea becomes as usefull to China as it is to the west?