What is the relationship between Goguryeo and the Yi tribe in ancient China?

In terms of blood and culture. Korea is a country established by immigrants from the Shang Dynasty. Later, people continued to immigrate from China to North Korea. Until modern times.

So North Korea is closer to China.

Goguryeo was a separatist country established by the Fuyu people who occupied Goguryeo County on the Chinese border. They are relatively primitive in terms of blood and culture, and are farther away from China.

Goguryeo was later destroyed by the Tang Dynasty and Silla (the main country on the Korean Peninsula). So the Tang Dynasty and Silla divided the territory of Goguryeo, with the Daedong River as the boundary between the two sides. The north was occupied by the Tang Dynasty, and the south was occupied by Silla.

North Korea/South Korea regards Silla as its orthodoxy and did not recognize Goguryeo in the past. But now that nationalism is rising in South Korea, it gradually needs to break away from the shadow of Chinese culture. But historically, the major countries on the Korean Peninsula: Silla, Goryeo, and Lee Korea were relatively weak, and they were all vassals of China. Only Goguryeo defeated China's main offensive many times. Therefore, those Korean nationalists confused their ancestors and regarded Goguryeo as one of their ancestors. Once we understand this, there is no need to play with those SBs. There is no need to follow them and tamper with history, insisting on describing Goguryeo as an ancient Chinese ethnic minority that established a country. (Because there were no ethnic minorities in ancient China, only the Chinese-Han people and other ethnic groups.)

Some people may say, if we don’t fight with Korean nationalists about these things, then we have no reason to regard Northeast China as Chinese territory? This is a bit childish. The territory of a country is not eternal. It expands when it is strong and shrinks or even splits when it declines. This is perfectly normal. When China's Han Dynasty was strong, the territory it invaded was larger than its original territory. Now it is taken for granted as Chinese territory. In the late Tang Dynasty, the country was divided and many places became independent. Vietnam, which has been a Chinese territory "since ancient times", became independent. What can we say? Can we use the argument that "Vietnam has been Chinese territory since ancient times" to regain Vietnam?

Haha