15& have returned with "Somebody"!

The girls already had their�comeback on 'K-Pop Star 2' and scored an�all-kill on the charts. "Somebody" is written by�Shim Eun Ji, who also wrote 15&'s debut single "I Dream",�as well as�Jo Kwon's "The Day I Confessed" and�IU's�"I Really Hate Him". It's composed by�Ryan S. Jhun and�Antwann Frost.

Having slayed with their comeback performance on 'M! Countdown', the girls continue on 'Music Core'.

Check out 15&'s comeback performance below!