just googled that and it seems
Recent scholarship has put the full death toll on all sides at just over 1.2 million
from the wiki.
then it goes on to say
2U.S. warplanes dropped more napalm and bombs on North Korea than they did during the whole Pacific campaign of World War II.[268]
As a result, almost every substantial building in North Korea was destroyed.[269] The war’s highest-ranking American POW, US Major General William F. Dean,[270] reported that most of the North Korean cities and villages he saw were either rubble or snow-covered wastelands.[271][272] US Air Force General Curtis LeMay commented, “we burned down every town in North Korea and South Korea, too.”[273]