Put it at the end of a setup scene, just before the reveal, then follow it with the Dun Dun Dun sound for the dramatic turn and the Censor Beep when the line needs covering.
關於此聲音
This clip is a single short police beep lasting just over a second, a clean electronic tone with no voice or music behind it. It lands abruptly and grabs attention at once, giving a brief sense of authority and urgency without turning playful or dramatic.