What is the relationship between Koreans in China, Koreans in Korea, Koreans in Korea and Koreans in North Korea? What comes first, what comes later?

The ancestors of Koreans are Koreans who moved from the Korean Peninsula to the northeast of China. It has been more than 300 years since the first batch of people moved in and settled. Most of them moved in from the late Qing Dynasty to Manchukuo. Now, many North Korean citizens have crossed the border into China. It is based on Koreans before Koreans, and Koreans are derived from Koreans.

note:

Korean nationality, also known as Korean nationality, is one of the main ethnic groups in East Asia. Korean nationality is usually regarded as a member of Tunguska-Altai nationality, and the nationalities closely related to it include Mongols, Japanese Yamato nationality, Manchu nationality in China and some nationalities in Central Asia. Korean people mainly live in North Korea, South Korea, Northeast China and the Russian Far East. The rest are scattered all over the world, such as America and Japan.

China has a deep relationship with North Korea. As we all know, the Korean nation has long been a vassal state of China, and the history of China-DPRK friendship is a meaningless history of hatred. There are many records of China's assistance to North Korea in resisting Japanese aggression. Modern China participated in the struggle against magnesium and aided Korea. The division of Korea was not caused by China, but the product of the Cold War. At that time, the former Soviet Union and the United States drew the 38th parallel to confront each other. The north of the 38th parallel is managed by the pro-Soviet government supported by the Soviet Union, and the south of the 38th parallel is managed by the pro-American government supported by the United States. North Korea has split into two countries. Because of the special relationship between China and North Korea, there should have been immigrants from the two countries a long time ago. There is also because the United States invaded North Korea. At that time, the United Nations troops led by the United States had almost completely laid the ground north of the 38th parallel, so China used a large number of immigrants.