Rookie group B1A4 has finally returned as full-fledged sophomores of the K-pop industry. The boys released their first full-length album "IGNITION" and their latest title track "Baby I'm Sorry".

On March 15th, B1A4 delivered their comeback performance on M! Countdown. The pretty-boys-turned-men members showcased a more mature image with their new upbeat and addictive melody. The title track "Baby I'm Sorry" was written and produced by member Jinyoung, proving out B1A4's musical capability.

Check out their comeback performance below!