Fromis 9 (Hangul: 프로미스나인 or 프로미스 9; initialism for From Idol School; stylized as fromis_9) is a South Korean girl group formed by CJ E&M through the 2017 reality show Idol School. The group's name, pronounced as "promise" in Korean, also means "to keep their promise to be the best girl group". 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.
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