Why did I repatriate on the day of the founding of the People's Republic of China, but the Koreans did not repatriate?

Different in nature. Although they are all immigrants, the Japanese are colonial aggression and the Koreans are illegal immigrants. After arriving in China, Koreans accepted the culture of China to a certain extent and fought side by side with the people of China against the Japanese invaders in War of Resistance against Japanese Aggression. The arrival of Japanese immigrants is to consolidate the achievements of aggression and destroy China culture. So we have different attitudes towards the two.