Place it just after the reveal in a short edit, then follow it with Anime Ahh for a sharper reaction and Hehe Boi as the second laugh before the next scene cuts in.
关于此声音
This is a three-second clip of one voice laughing 'uehehehehehe' in a mischievous style, as if enjoying a secret. It feels smug and playful, like someone who has just got away with a small trick and cannot hide their delight, and the drawn-out laugh makes the amusement feel deliberate rather than accidental.