Promise now, cherish it preciously~ We will grow as into your idols. Hello, we are Fromis_9! (이제는 약속해~ 소중히 간직해~ 당신의 아이돌로 성장하겠습니다. 안녕하세요, 프로미스나인입니다!)
fromis_9 (프로미스나인; initialism from fromidol school) is a nine-member girl group formed by CJ E&M Music through the 2017 Mnet reality show Idol School. They released the pre-debut single "Glass Shoes" on November 29, 2017 and officially debuted on January 24, 2018 with the mini album To. Heart.
Their group name is fromis_9, which means from (I)dol (s)chool, pronounced as "promise nine" as it is a promise to their viewers to be the best girl group.