Korea had been annexed by the Japanese in 1910, and they ruled it until 1945. The Japanese (literally) moved in, and told the Koreans what to do - most notably to not to try to become independent. Koreans also were moved to Japan when the war broke out to work - since so many Japanese were
in the military. (This was declared as âconscriptionâ, since Korea was technically part of the Japanese Empire.)
Koreans also were in the Japanese military (since there wasnât a âKorean militaryâ) - until 1943 as volunteers (of which there were less than 20,000, according to the Japanese), but then began being drafted in 1944, when the Japanese started running out of men. The only full year (1944) of conscription saw 200,000 Korean men drawn into the Japanese Army. Even so, they were not trusted with major combat by the Japanese.
Koreans were also sent as forced labor to various islands to build installations for the Japanese.
And, of course the forced prostitution of up to 200,000 Korean women (about half of the total, most of the others being Chinese).
Kim Il-Sung was a partisan against the Japanese in the 1930s, before he was sent by the Soviets to the Soviet Union for âeducation and indoctrinationâ as a communist. In WWII, he was part of the Red Army, rising to the rank of Major.
Syngman Rhee was jailed by the Japanese for anti-Japanese agitation (the Japanese were already running Korea, just not officially) for six years 1898-1904; upon release he went to Princeton University, and earned a doctorate (first Korean to do so.). He got back to Korea just in time for it to be annexed by the Japanese; he fled to Hawaii, and spent the next 30 years speaking out against the Japanese and trying unsuccessfully to interest the US or anybody else in helping the Koreans free themselves. He was also president of a Provisional Korean government for 20 years.
When WWII broke out, Rhee moved to Washington, DC to advocate for a free Korea after the war (as we know, he was only half-successful, as Korea became - again - the plaything of foreigners.