Can you tell who is from Korea and who is from China when you see them in-person?

[SpaceGalaxy]

or like can you tell who is from China and who is from Vietnam just by looking at them? If so, how?

[Kaneki05]

Unless one is born in a culture in which they see a certain race all the time it's hard to narrow it down from region to region. Like would a person from China be able to tell Irish vs Scottish who aren't obvious stereotypes of course not, though me as a British person I can tell such features even by just looking at someone.
And that's not say errors don't exist but I would be more likely to notice such features of course as I see such Irish and Scottish features all the time.

So no, I would just know they are from Asian descent in someway.

[DarkLegacy]

Well they all look alike to me but yes there is slight differences that tells them aprt.

[Jooying]

Actually really hard. If all we were raised in our original country then maybe we look slightly different in the ways of how we dressed and makeup. But if you were talking about nationality and all raised in the US or other western countries, then the answer is no. I can't tell who's from where originally.

[menina]

No, I can't tell unless they tell me where they are from.
Asian people are not all the same, to believe in that is to have racist views. Just because someone "looks Asian" it doesn't mean they're Korean, Chinese or Vietnamese.
You can't tell a person's nationality just by looking at them.

[strateguy632]

yes, sometimes i am wrong but most my guesses correct due to a picture where i compared skulls of nearby countries.

identical twins sometimes somehow dont have identical skulls.

[NathanDavis]

I don't have a need to do so