The line comes from Back Door, a 2020 song by South Korean group Stray Kids, released as the title track of their repackaged album In Life and promoted with a high-energy music video. The track became one of the group's signature releases, and short vocal moments from it were quickly clipped for fan edits, reaction videos and short-form posts. This invitation line stood out because it works outside the song, functioning as a standalone cue for entrances and reveals. Its brevity and recognisable K-pop energy keep it useful for creators who want an instant, playful setup.