"Really?" indicates that Sunny didn't have a clue, actually; maybe been away from the language too long or just wasn't paying enough attention, or maybe Jae's accent really isn't that much at all and his paranoia is baseless. Either way, he seems curious instead of-- anything else. Some nations have the most passive aggressive of relationships, particularly after feud, war, occupation.

Baedal is unique that way, too. There's no diplomat for international affairs, and most of the people the cohort newbies are steered to interact with are imports themselves, otherworld ex-pats. "When did you move?"