Are Japanese and China related by blood? Is it possible to find evidence that the Japanese are descended from China through genes?

It is certain that China people are related to some Japanese people, because in the long history, China people have moved to the Japanese archipelago, and there is a legend that Xu Fuyuan went to the sea. After that, as long as there is turmoil in the Central Plains, there will be large-scale population migration and mobility, including those who cross the sea to Japan. In Japanese history, there are records that China immigrants were incorporated into the Ministry. Many people moved to Japan in the late Ming and early Qing dynasties, and many of these people were integrated into Japan. During War of Resistance against Japanese Aggression's period, Japan plundered China's infants and raised them to improve their "race", hoping that China's genes would improve the Japanese's height. (this kind of thing is mostly in the northeast, and I am from the northeast. I often hear old people mention it. These children were educated by the Japanese and became Japanese in a subtle way. If they marry a real Japanese, their descendants will be "more" Japanese. If not strictly divided, Japanese and Japanese are genetically related. After all, they are all yellow people and all live in East Asia. But strictly speaking, we can't know the specific gene maps of China and China now, so there is no conclusion yet. What is certain, however, is that China and some Japanese originally originated from one nation. As for whether other Japanese people are related to China people, we can only wait for the results of scientific research.