DNA is a 2017 single by South Korean group BTS, released as the lead track from their Love Yourself: Her EP and one of their first major international breakthroughs. Its bright, melodic hook, including this short whistle phrase, helped the song stand out on radio, streaming and fan edits worldwide. As short clips from K-pop choruses began circulating on soundboards and social video apps, this whistle became a handy shorthand for BTS itself, letting creators signal the group, the song or a playful K-pop mood in just a few seconds.