Belllie've you! Hello, we are Billlie!
In February 2020, MYSTIC Story opened an Instagram account for MYSTIC Rookies, a pre-debut team of their seven female trainees: Moon Sua, Suhyeon, Haram, Tsuki, Siyoon, Lee Soomin and Takeuchi Miyu, all of whom were potential members of the agency's first girl group. However, Soomin and Miyu left the team in August 2020 and May 2021, respectively.
On September 27, 2021, a series of dance covers were started in partnership with 1MILLION Dance Studio, the first dance cover was of Beyoncé's "Diva" and performed by Moon Sua, Tsuki and Siyoon. On October 3, 2021, a cover of Cardi B's "Up" was published, now being performed by Suhyeon, Haram and new member Haruna; officially revealing her as their sixth and final member. On October 10, 2021, a cover of Ashnikko's "Slumber Party" was released, this time performed by the entire group.
2021: Debut with The Billage of Perception : Chapter One, addition of Sheon and "The Collective Soul and Unconscious: Snowy Night"
On October 11, it was announced that this group would be called "Billlie" and include the previously revealed trainees Moon Sua, Suhyeon, Haram, Tsuki, Siyoon and Haruna.
On October 28, a fan song titled "Flowerld" was released on the group's YouTube channel. It was later confirmed that the track will be featured on the group's debut album. It was also announced that the group will debut on November 10 with their first mini album The Billage of Perception : Chapter One.
On October 30, concept photos of the group and members for their debut mini album were revealed, starting with individual photos of Haram, Tsuki and Haruna, followed by photos of Moon Sua, Siyoon and Suhyeon and a group photo a few hours later.
2022: The Collective Soul and Unconscious: Chapter One, "Track by Yoon: Patbingsu", The Billage of Perception : Chapter Two
On January 27, 2022, Mystic Story confirmed reports that Billlie is preparing for a comeback, slated for a late-February release. On February 11, a teaser poster was released, revealing that they would be releasing their second mini album The Collective Soul and Unconscious: Chapter One on February 23.
On March 1, it was announced that Billie would be releasing an OST album, The Collective Soul and Unconscious: Chapter One Original Soundtrack from "What is your B?", on the same day at 6PM KST. The soundtrack contains the score music used in "What is your B?", which was released as a concept story film for their second mini album.
On June 23, a source from Mystic Story shared that Billlie will be releasing a song through Yoon Jong Shin's new music project in mid-July. The song, a remake of Yoon's song "Track by Yoon: Patbingsu", was released on July 14.
|Moon Sua (문수아)||Main Rapper, Lead Vocalist||Purple||2020–present|
|Suhyeon (수현)||Main Vocalist, Lead Dancer||Green||2020–present|
|Haram (하람)||Main Vocalist, Sub Dancer||Pink||2020–present|
|Tsuki (츠키)||Main Dancer, Sub Vocalist||Red||2020–present|
|Sheon (션)||Main Dancer, Lead Rapper||Orange||2021–present|
|Siyoon (시윤)||Main Rapper, Lead Dancer||Yellow||2020–present|
|Haruna (하루나)||Sub Dancer, Sub Vocalist, Maknae||Blue||2020–present|
- The Billage of Perception : Chapter One (2021)
- The Collective Soul and Unconscious: Chapter One (2022)
- The Billage of Perception : Chapter Two (2022)
- 2022 Boryeong Sea Mud Exhibition K-MUD Global Show K-POP Concert (2022)
- MIK Festival 2022 (2022)
- Their role model is the girl group Girls' Generation.
- Tsuki is a former member of 7+ME LINK and MAGICOUR, under the name "TARU".
- Tsuki is also a former SM Entertainment trainee, she was known as "RAVI".
- Moon Sua is a former YG Entertainment trainee and trained under them for 10 years.
- Sheon is a former A team Entertainment trainee.
- Multiple members have previously competed on competition shows.
- Main article: Billlie/Gallery