WM Entertainment's new boyband 'B1A4' has been headlining for their�unique webtoons concept, which later opened up to individual member teasers that aimed to showcase the charms of the group. After much anticipation, the group has finally unveiled their music video teaser for their debut title track, "OK". They've even uploaded a new group photo to boot! Check it out below: -- The boys will be making their official debut on April 21st.�If you missed the individual member teasers, check them out here: Baro, Gongchan, Sandeul, CNU, Jinyoung. Source: B1A4 official site