Billlie debuted on November 10, 2021 under Mystic Story.
On November 19, 2021 it was announced that Kim Suyeon would join Billlie under the stagename Sheon after discussions with Mystic Story and the Billlie members.
- Moon Sua (Moon Sua): September 9, 1999
- Suhyeon (Kim Suhyeon): January 15, 2000
- Haram (Kim Haram): January 13, 2001
- Tsuki (Fukutomi Tsuki): September 21, 2002
- Sheon (Kim Suyeon): January 28, 2003
- Siyoon (Kim Siyoon): February 16, 2005
- Haruna (Osato Haruna): January 30, 2006
- Korean website
- Japanese website
- Official fancafe