Han Chinese｜MyHeritage dna test northern china

I live in Beijing, North China. My patrilineal haplogroup is O2a-f444, and my matrilineal haplogroup is B4c.I don't know why there are a lot of Mongolian and Japanese and Korean ingredients in my genes. I am Chinese and I have never had Mongolian or Japanese and Korean ancestors. I want to know the reason for this, thank。

Видео Han Chinese｜MyHeritage dna test northern china канала Dante Sun