#1 the two koreas are still at war.
#2 south korea has specifically said that they do not want nuclear weapons in south korea.

why do you think they didn't drop the bomb when the allied forces were pushed all the way back to the Jai ju island during the war.

Peace will not come easily. North Koreans are brain washed. When aid workers asked North Koreans if they would fight to the death or join South Korea, all answered fight to the death.

My 2cents and I am out.