Related, 2-3 million civilians were killed in the Korean war, which is roughly 10% of the entire population. From Wikipedia:

Almost every substantial building in North Korea was destroyed as a result.[372][373] The war's highest-ranking US POW, Major General William F. Dean,[374] reported that the majority of North Korean cities and villages he saw were either rubble or snow-covered wasteland.[375][376] North Korean factories, schools, hospitals, and government offices were forced to move underground, and air defenses were "non-existent".[370] In November 1950, the North Korean leadership instructed their population to build dugouts and mud huts and to dig tunnels, in order to solve the acute housing problem.[377] US Air Force General Curtis LeMay commented: "We went over there and fought the war and eventually burned down every town in North Korea anyway, some way or another, and some in South Korea, too."[378] Pyongyang, which saw 75 percent of its area destroyed, was so devastated that bombing was halted as there were no longer any worthy targets.[379][380] On 28 November, Bomber Command reported on the campaign's progress: 95 percent of Manpojin was destroyed, along with 90 percent of Hoeryong, Namsi and Koindong, 85 percent of Chosan, 75 percent of both Sakchu and Huichon and 20 percent of Uiju. According to USAF damage assessments, "Eighteen of twenty-two major cities in North Korea had been at least half obliterated."[366] By the end of the campaign, US bombers had difficulty in finding targets and were reduced to bombing footbridges or jettisoning their bombs into the sea.[381]

You'll likely never see a major movie made about this. And people question why North Korea pursued nuclear weapons.