Place it at the reveal point in your edit, right after the visual evidence appears. Follow it with a correct answer gameshow sting when the discovery is right, or leave it solo when the realisation is meant to stand as the final beat.
關於此聲音
This is a very short sung clip of the phrase 'I saw the sign', lasting just under two seconds. It lands as a bright, knowing realisation, the musical equivalent of suddenly spotting the obvious. The tone is upbeat and a little smug, perfect for that split second when a clue, a warning or a coincidence finally makes sense.