I feel like this is arguing semantics rather than addressing the point at issue, but if we must, we must. Race is an imprecise term, the definition of which depends on context. There are indeed distinct Japanese and Korean ethnic groups. After pointing out this distinction, I broadened the scope of my comments to that of "place of origin," because it furnished an additional example to further illustrate that we needn't view an actor's background as determinative of a character's, and thus that we needn't press ourselves to "explain" a discrepancy between them. You're right that ethnicity and nationality are not necessarily one and the same, but that really doesn't affect the substance of what I'm saying at all. Let's not be obtuse.