Lee Chang-sub of the group 'BtoB' is posing for Mnet M Countdown' live rehearsal at cj ENM Center in Sangam-dong, Mapo-gu, Seoul on the afternoon of the 15th.
On this day, M Countdown will feature Kwill, Hay Girls, JBJ95, TWICE, Promis Nine, ATIZ, MXM, Hot Shot, The Man Black, Wikimki, Golden Child, April, Mighty Mouse, Stray Kids, Eyes One, Gugudan, Seo In Young, Monster X and BtoB.