[thisislife2]

It's not the South Koreans per se that they have a problem with - it's the presence of the US military in South Korea that is seen as the real threat to North Korea. So if the South Koreans honestly want to repair their relation with the North Koreans, they will, at the very least, have to ask the Americans to leave. But the Americans will not leave because they have a hostile relation with the North Koreans, and they believe their presence in South Korea is the only thing preventing the North Koreans from throwing a few nukes at them. China and Russia will also not allow the North Koreans to repair their relations with the South Koreans unless they have guarantees from South Korea that they will be mindful of Chinese and Russian security concerns (which, in realpolitik terms would require South Korea to cut of ties with the US military and becoming "neutral").