Put it at the very end of a scene, after the reveal has landed. Play the Dun Dun Dun sound first to mark the twist, then let this clip close the sequence before the next scene begins.
關於此聲音
This is a short, roughly four-second dark atmospheric fade with a low, shadowy tone that sinks away instead of ending abruptly. It feels tense, ominous and quietly unsettling, like the last breath of a scene before everything goes black and the listener is left waiting in the dark.