Please dont get me wrong i dont want any feel bad about this but if i a think a guy is from japan and he is not,and hes from china for example he could get mad, i dont want that happenned to me is just curiosity, please dont get mad with this question.
actually looking at their facial features, they have different facial structures. Although most people usually just classify all of us as "asian". usually fellow asians can tell the difference between the races where non asains seem to find it hard.
sorry if said something bad, im going to delete that question.
Ask him..."where are you from?"....
a slight difference in the eyes,
Im a messican :*