Place it right after the bad-news line in your edit, then follow it with the sad violin sound button for the full mock-tragedy sequence, and let that pairing carry the scene before cutting to the next reaction shot.
關於此聲音
This is a just over two second clip of a small, exaggerated whimper, like someone doing a pitiful little cry on purpose. It sounds tearful without being genuinely distressing, which gives it a mock-sad, funny feeling that lands as playful sympathy rather than real upset for the listener hearing it.