Place it right after the question in an edit, as the answer, then follow it with Ceeday Huh when the other person refuses to accept it. For a longer exchange, add No No Wait Wait before it to build the confusion first.
关于此声音
This is a short spoken clip lasting about 1.7 seconds, built around a single casual utterance of the word dunno. The voice sounds relaxed and unconcerned, as if the speaker is brushing off a question without thinking twice. It feels light, awkward and slightly dismissive, the kind of reply that turns not knowing into a joke instead of an apology.