It must be blood, just like many overseas Chinese in Southeast Asia now. Although many of them can no longer speak Hakka or Mandarin, this does not change the fact that they are Hakka.

? There is another very interesting saying. Generally, the little toenails of Hakka people are two-parted. Because the Hakkas migrated south from the Central Plains area (mainly Shandong, Shanxi, Henan and other places), orthodox Han people, that is, people from the ancient Central Plains area, all have this characteristic, the characteristic of multiple nails on the little toes. Nowadays, some people in Shanxi and other places still have this characteristic. It’s hard to say specifically, because this aspect is just some vague opinions and there is no specific scientific research.

? The fusion of different bloodlines in modern society is too frequent, although most Hakka people have escaped the intrusion of Wuhu and Chinese. But people living in the Hakka area now can't guarantee the purity of their bloodline. Maybe a generation ago, the maternal line was the She ethnic group, or a certain ethnic group in the Baiyue... It's a long shot. Liz, take a look at your little toenails, haha, it’s just for reference, not accurate!

As shown in the picture