Place it right after the mystery post appears in your edit, then follow it with Ceeday Huh for another question from the group, and finish with No No Wait Wait when the sender tries to explain it away.
關於此聲音
This is a short Russian voice clip, lasting about 2.6 seconds, in which a speaker repeats a puzzled question asking who sent something. The delivery is quick and bewildered, giving it a funny, suspicious edge that fits moments of confusion in a chat. It works as a light accusation when an unexpected message, image or clip appears out of nowhere.