LC9, also nicknamed 'Brown Eyed Boys', have finally made their debut with "Mama Beat" on 'M! Countdown'!

The song is a powerful track featuring Brown Eyed Girls' Ga In, who lends her beautiful voice to the song. LC9, composed of members J-Hyo,�RASA,�King,�AO,�Jun, and�E.Den, is an abbreviation of their official name, 'League of Competition #9'.

Without further ado, check out their awesome debut performance below!