I’m convinced the NK invasion of SK would end at the first grocery store.
I've thought of that, also. However, what would be left of Seoul after the Nork's huge artillery attack? Plus, the new Allies would have decimated NK and there wouldn't be much left for an infantry invasion. Then maybe, once the first artillery shells fly, the Tomahawks and bombs fly immediately. Maybe Seoul wouldn't get hit as hard as we uniformed think.
It's all speculation on our part since neither of us know the DOD game plans for the different scenarios regarding NK. And no, I don't believe Trump would use nukes unless Kimmy is stupid enough to expand from conventional warfare.