South Korean government did not help Koreans living in Japan during hard times North Korean government isolated and poor they were  years ahead supporting Koreans living in Japan during economical and political hard times Majority of  percent Koreans living in Japan are from Southern Province island  Chejudo Koreans living in Japan do not like to divide political alliances between North or South because majority of them came from South Korea whereas to preserve Korean cultural identity they studied or supported North Korean government run schools  Populations If you combine all Korean populations in Japan  Main island plus Sakhalin island it would be about  million  Korean KoreanJapanese  mix KoreanRussian mix