How does North China treat immigrants from the south?

No Koreans immigrated to northern China, only Koreans fled from North Korea to China, Russia and South Korea. North Koreans who fled to China were usually sent back to Korea by the People's Liberation Army and executed by the fascist regime of North Korea. After that, he served hard labor for life and his descendants were discriminated against. Before, one of them was sent back by China and put on a tightrope by the Korean People's Army.