Ka kammala wannan magana: A shekara ta 1931, Japan ta shirya Rikicin Mukden kuma ta mamaye arewa maso gabashin China da karfi, sannan ta kafa wata kasa mai suna Manchukuo. A ranar 14 ga Satumba, 1936, Jafananci sun kafa wata ƙungiya ta musamman (滿鮮拓殖會社) kuma sun fara ƙaura manoman Koriya zuwa Arewa maso gabashin China a cikin tsari mai tsari. A shekara ta 1945, lokacin da
Japan ta mika wuya a karshen yakin duniya na biyu, akwai 'yan gudun hijirar Koriya sama da miliyan 2.16 da ke zaune a Arewa maso gabashin China. A cikinsu, wajen mutane 700,000 ne suka koma Koriya bayan Yaƙin Duniya na II. A cikin 1947, adadin 'yan gudun hijirar Koriya sun ragu zuwa miliyan 1.4, mafi yawansu suna zaune a yankunan da jam'iyyar kwaminisanci ke sarrafawa, ƙasa da 100,000 ne kawai ke zaune a yankunan da Kuomintang ke sarrafawa.