Last edited:
If Chinese historical alone is not enough , then from historical perspective,then there really isn't any evidence that show Korean and Manchu are related either. There's no historical text that show Korean and Manchu are related but there historical text that show they are not related. But then again, if we use all human out of Africa, everyone pretty much relate with each other.The problem is only the Chinese Historical says that the language of Goguryo and other Korean languages differ significantly from the language of people in Manchuria ex Mohe language. The Koreans , the main land chinese and the Japanese sans Hokkaido and Okiwana and Taiwanese are sinodont mongoloid. So there must be a connection point between the Koreans and the manchurian.
Judging from what you say, everyone from your list there from Han Chinese, Japanese, Korean,Manchu all have connection point as they are all Sinodont mongoloid but the connection point is too general and vague as it can range from out of Africa period to any period of time.