の?」「うん

…? Yeah.

→ の
phrase Rare #23,190
…? Yeah. The question ending の? often asks for confirmation or an explanation; うん is a casual way to say “yes.”
JA: 疲れてるの?」「うん、少し。
EN: Are you tired? Yeah, a little.

「何も買わないの?」「うん、もうご飯食べたから」

“You’re not buying anything?” “No, I already ate.”

「緊張してるの?」「うん。ちょっとね」

“Are you nervous?” “Yeah, a little.”

「鍵はあるの?」「うん。あるよ」

“Do you have the key?” “Yeah, I do.”

「キスしたの?」「うん。したよ」

“Did you kiss?” “Yeah, I did.”

「喉が痛むの?」「うん。少し」

“Does your throat hurt?” “Yeah, a little.”

「買いたいの?」「うん」

“Do you want to buy it?” “Yeah.”

「君って先生なの?」「うん!」

“Are you a teacher?” “Yeah!”

「彼女いないの?」「うん」「じゃあ彼氏は?」

“You don’t have a girlfriend?” “No.” “Then do you have a boyfriend?”

「喉が痛いの?」「うん。ちょっと」

“Does your throat hurt?” “Yeah, a little.”