Place it at the end of the build-up, just before the door opens or the stranger is named, then let the reveal answer it. Follow a disappointing reveal with Bruh, and follow a surprising one with Oh My God, so the question sets up the reaction that follows.
關於此聲音
This clip is a spoken Korean phrase asking 'Who is it?', lasting about four seconds. It feels curious and a little suspicious, with a playful edge that makes an unexpected knock or an unidentified caller feel funnier. The direct question lands as a light challenge, inviting the listener to wonder who is on the other side.