Singer Seo In-young poses at the pre-rehearsal of Mnet 'M Countdowndown Down' live broadcast at cj ENM Center in Sangam-dong, Mapo-gu, Seoul on the afternoon of the 15th.
On the day of the M Countdowndowndown, Kwill, Hay Girls, JBJ95, TWICE, Fromis 9, ATIZ, MXM, Hot Shot, The Man Black, Wikimki, Golden Child, April, Mighty Mouse, Stray Kids, Eyes One, Gugudan, Seo In-young, Monster X, I'm in.
About Fromis 9
Fromis 9 is a South Korean girl group formed by CJ E&M through the 2017 reality show Idol School. 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.
 Wikipedia