This is claimed by so many people for the Koreans. "Go back to your country!"
You, Koreans have to prove your own credentials to live in Japan. Japanese law necessitates your ancestor to have ex-Japan nationality for your qualification. Japanese law necessitates your ancestor to have ex-Japan nationality for your qualification. You have to qualify yourself for your own reason why you can be living in Japan. This is international rule. Everywhere in the world you have to explain with your own evidence.