It would depend on who will be the first one to take military action. If King Jong Un would make the first move, then there is a very big chance that other countries that it is in conflict with will go all odds in trying to remove North Korea from the map.
This can be very problematic, especially since North Korea also holds various nuclear weapons and other tools that will affect not only North Koreans and other neighboring countries but also the rest of the world. It is important that different countries would start to have peace with each other soon to prevent this from happening. There are definitely a lot of people who will be affected by it.
What course a military conflict might take in the Korean peninsula most likely depends on if Kim Jong Un decides to be the first to use military action. If Kim takes first action, the United States President Trump has promised that North Korea, “… will be met with fire and fury like the world have never seen.”
Actually to be more accurate Trump said that in regard to if Korea made any new threats. Either way it’s a terribly scary thought and one that God willing, never happens. Aside from that, the United States has also said all options, obviously including military options, are on the table.