What happens with the koreas and South korea?
UMMMMM?
shareKorea was already a Japanese colony before the war.
shareIn real life, Japan annexed Korea in 1910 after militarily occupying parts of it and subverting its government over the previous 15 or so years: https://en.wikipedia.org/wiki/Korea_under_Japanese_rule#Japan.E2.80.93Korea_annexation_treaty_.281910.29m
In the TMitHC timeline, Korea is thus presumably still considered part of Japan, with the ethnic Korean population probably having been even further reduced/displaced by Japanese colonists (in real life there were an estimated 700,000 Japanese colonists living in Korea by 1945, not including military personnel -- http://shinku.nichibun.ac.jp/jpub/pdf/jr/JN2409.pdf).