Where did the ancient Han people go

Descendants of the Han people in the ancient Central Plains, whose blood system was relatively closed, existed in Guangdong and Fujian, because people fled to the south and then settled in the south during the wars in the Central Plains in previous dynasties. Slowly, they formed immigrants like a great migration. As for looks, the Han Dynasty liked being thin, the Tang Dynasty liked being fat, and the Qing Dynasty liked feet.