는데요

Here's the thing — setting up

It closes the sentence politely while leaving it open, so the listener waits for the rest: about those costumes earlier, I have one; we have something to say. Three of these lines are wrap-up lines from explainer videos, where the speaker sums up what was covered and then turns to the audience, as in today we talked about Korean surnames, so what did you think. The plain form is 는데.

Register: polite conversational