GBB (가위바위보; an acronym for Gawi Bawi Boo; in English Rock Paper Scissors) was a five-member girl group under ProBeat Company. They debuted on May 1, 2018 with the mini-album "Girls Be The Best".
On March 20, 2020, Chaehee confirmed through an Instagram live on her personal account that GBB had disbanded. 
- Chae Hee (채희) - Leader, main rapper, dancer
- Ji Ni (지니) - Sub-vocalist, rapper, dancer
- Doo Ri (두리) - Main vocalist, dancer
- Cheris (체리스) - Sub-vocalist, dancer
- Sona (소나) - Vocalist, dancer
Digital mini albums
- Girls Be The Best (2018)
- Chae Hee, Doori and Ji Ni are former members of the girl group Sol-T.
- Sona was the latest member to join the group.