Despite what people keep saying, a war in NK would be short and one sided. While they could cause a lot of destruction at the start, after a few salvos their artillery would be taken out by air power. Then their entire command and control structure would be eliminated so they couldn’t communicate with their troops at all. And those troops are conditioned to not do anything without orders. So at best they’d be sitting ducks waiting to be taken out. And I’m pretty sure most of them would cost to surrender once it’s clear that the regime is gone. There’d be a share of diehards that would choose death over surrender but i don’t think that would be a large percentage.