Cantonese have over 60% of Y-DNA from North China, while 80% of their mtDNA is native.
Shanghainese for example, we have less Y-DNA from North China, while our mtDNA is more North Chinese than Cantonese.
lol, the first Nanyue King was a Huaxia man by himself, of course he had much more ties with the Han Dynasty than with Vietnam.
Have you read the classic 'Outlaws of the marsh' ?
There's an excerpt there when one of the villagers was lamenting about the actions of the bandits. The villager is a prototype of the righteous ruler because he says that differences are put aside when matters involve the state. Even in such a time, there was already a concept of modern day nationalism.