B1A4 debuts on M! Countdown with “OK”

After melting the hearts of fans with their unique webtoons marketing style, WM Entertainment’s newest boyband, ‘B1A4‘, has finally made their debut on today’s episode of “M! Countdown“!Their unique name is an abbreviation of ‘Be the one, All for one’, and also stands for Baro being type B blood, while Jinyoung, CNU, Sandeul, and Gongchan being type A. Their title track, “OK“, is an electronic