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Billlie (Korean: 빌리; RR: Billi; stylized as Bi11lie or Billlǃə) is a South Korean girl group formed by MYSTIC Story. Billlie debuted on November 10, 2021, with the extended play (EP) the Billage of perception : chapter one. The group originally consisted of six members: Moon Sua, Suhyeon, Haram, Tsuki, Siyoon and Haruna. A seventh member, Sheon, later joined the group. On April 1, 2025 the group announced the release of the single "Snap", to be released by a unit consisting of members Moon Sua and Siyoon, on April 7.