calico cat #4333260
Description
Billlie (빌리), formerly known as Mystic Rookies is a 7-member girl group under Mystic Story Entertainment (a subsidiary label of SM Entertainment). The group consists of: Moon Sua, Suhyeon, Haram, Tsuki, Sheon, Siyoon, and Haruna. Sheon was announced as a new member on November 19th, 2021. This group has no leader and they officially debuted on November 10, 2021.
Written by the group; not a statement by this register.
Membership history
Growth
Growth history is still building. We hold one measurement for this entry. A trend needs at least two, taken days apart — so this will fill in on its own rather than being estimated. We do not publish numbers we have not measured.
| Measured (UTC) | Members | Change |
|---|---|---|
| 1 Sept 2026, 00:19 | 14 | first reading |
Ownership
Owned by user #366481203 as measured.
Members we’ve seen
cheezysteve (@sittingmonkeys) — :D (rank 1)
A sample — only members this register has independently measured, highest rank first. Not the full roster.
Rank structure
Roles and per-rank member counts as Roblox reports them (rank 0 = guest … 255 = owner).
Related groups
Groups whose measured members overlap with this one — a sample from our membership graph.
Open data
Download this group’s measured record — free to reuse with attribution: membership history (CSV) · full record (JSON)
Each file carries its licence and retrieval time inside it, and is generated from the same measurements shown above.