That expression right there just screams "the heck's a 'korean?'".
He might have heard of Korea from other first generation Visitors, actually? (or might not? Not 100% sure) But the way he imagined it was probably "like Keol, but in a different place." And Ethan doesn't look like a Keol native, so even if he's heard about Korea, that would've caught him off guard.
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