Place it just after the mystery is revealed, following Sudden Suspense to set up the question, then follow it with Ceeday Huh and finish the sequence with Oh My God Wow.
关于此声音
This 3.4-second clip is a short Korean voice line centred on the question of who sent something, delivered as a quick reaction rather than a longer exchange. It lands with puzzled, slightly suspicious humour, asking the obvious question in a direct, pointed way that leaves little room for doubt.