Actually, nothing happened. Kim Jung Un is merely seeking to see himself on TV
Kim is trivial nothingness presiding over a population that will die of starvation in the next 90 days
It’ll be nothing, so long as South Korea has scrambled some ships to prevent li’l Kim’s army from invading those islands. But shooting back? Li’l Kim carefully aimed his salvos to just North of the borderline. Nothing to shoot back at. Yet.