Place it right before the reveal moment in your edit, with the footage running underneath while the singing plays. Follow it with a game show buzzer sound effect for a caught-moving fail, or a bruh sound effect when the mistake is more silly than tense.
关于此声音
This is an 8-second musical excerpt of the childlike singing associated with the giant doll that runs the Red Light, Green Light game. The innocent, sing-song quality turns tense very quickly, because listeners expect a sudden stop and a penalty for moving. It comes from the South Korean series Squid Game, released in 2021.