Fromis 9 (Korean: 프로미스나인 or 프로미스 9), stylized as fromis_9, is a South Korean girl group formed by CJ E&M through the 2017 reality show Idol School. The group was co-managed by Off The Record and Stone Music. The group is composed of nine members: Roh Ji-sun, Song Ha-young, Lee Sae-rom, Lee Chae-young, Lee Na-gyung, Park Ji-won, Lee Seo-yeon, Baek Ji-heon and Jang Gyu-ri.
The group debuted on January 24, 2018, under Stone Music Entertainment with the release of their first extended play (EP), To. Heart. In September 2018, it was confirmed that Fromis 9 would be managed by Off The Record Entertainment, a new label established by Stone Music.