Ki Hee-hyun of the girl group 'DIA' attended the rehearsal of Mnet 'M Countdown' held at CJ ENM Center in Sangam-dong, Mapo-gu, Seoul on the afternoon of the 28th.
On this day, "M Countdown" will feature the Pentagon, Momoland, Ko Seung-hyung, Tibird, JBJ95, Tray, Lay Jay, 1TEAM, Park Girl, Ha Eun X Joseph, Everglown, Girl of the Month, Tomorrow By Together, 100%, DIA, Jung Se-un, Stray Kids, KARD, and (girls) children.