Between 1945 and 1951, some one million residents of North Korean fled to South Korea. Among them were landowners, businessmen, middle-class intelligentsia, pro-Japanese collaborators, religionists, and foreigners.
They left home taking only what they could carry - a small suitcase or a sack. Everything else was left behind. It is true that many (what % - I don't know) homes and business properties were bombed out during the Korean War and those that survived, the communist cadres took over.
Years back, North Korea allowed in a handful of the former property owners: and, believe it or not, they bad-mouthed the current occupants of their ancestral homes and caused some uneasy unhappiness in Pyongyang and the big shots there decided - 'no more reactionaries'.