Millions of leaflets dropped on major population centres and army bases explaining just what the outside world thinks of Kim, that he just a fat bloke with bad haircut who doesn't score a hole in one everytime playing golf, what South Korea is like I would think would help inspire enough of the population including the army not to resist and in fact welcome the SK army with open arms much like Europe did as the allies gained ground after D-Day.
NK isn't afterall populated by people who beleive in a pixie in the sky