group Stray Kids poses at the pre-rehearsal of Mnet 'M Countdowndown' live broadcast at cj ENM Center in Sangam-dong, Mapo-gu, Seoul on the afternoon of the 15th.
M Countdowndown Down will feature Kwill, Hay Girls, JBJ95, TWICE, Promis Nine, ATIZ, MXM, HOTSHOT, The Man Black, Wikimki, Golden Child, April, Mighty Mouse, Stray Kids, Eyes One, Gugudan, Seo In Young, Monster X and BtoB ...
About BtoB
BtoB is a South Korean boy band formed in 2012 by Cube Entertainment. The group consists of Seo Eun-kwang, Lee Min-hyuk, Lee Chang-sub, Im Hyun-sik, Peniel Shin and Yook Sung-jae.
 Wikipedia