Really? Because with Biden, we can bet the US will probably just play the “oh we support South Korea but we aren’t gonna do a darn thing about the situation” card. China would be on their side (bc North Korea gets away with running its country in the hellish way they do because China lets them get away with it), and Russia would also be on their side, as they are allied with China themselves. That’s the three biggest powers in the world right now, one would miss the part where it’s their problem (bc the leader is on a payroll from at least one of the other two), and the other two would support the whole thing. So, yeah I don’t think his country would get destroyed.
I actually watch South Korean TV shows and they’ve actually had a few instances in shows I’ve seen where the country gets panicked because North Korea is testing bombs and it’s getting out of control. It is a concern there. How big of a concern it is is up for debate since I’ve never been there myself (though I know some ppl irl who have been there), but it definitely has gotten far worse with Biden in office, especially after he showed he can completely abandon a country and leave the people to get massacred and just not care, like when he went full Make Taliban Great Again on Afghanistan.