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Billlie (빌리) is a South Korean girl group under MYSTIC Story (a subsidiary label of SM Entertainment). The group originally consisted of Moon Sua, Suhyeon, Haram, Tsuki, Siyoon, and Haruna. A seventh member, Sheon, was announced to join the line-up. They officially debuted on November 10, 2021, with the mini-album: the Billage of perception : chapter one.