I would do nearly the same as I would during a zombie apocalypse:
Quickly get my (always ready) Survival backpack with supplies for a month, medical supplies, camping material, tools and the like and than would hide in my cellar that I'd build up like a castle with the materials already available. If more time is given, I'd take this backpack and travel to antarktika. There I'd do some experimants, so that I could explain Harvard this ineffective gap-year.
TL;DR: I wouldn't fight. Especially because I see no real reason for something like this... N and S Korea are like children, why should I give my life for something like this?