A famous producer and composer, Sin-Sa Dong Tiger, introduced his new girl group named EXID. He is famous for producing 4-Minutes, G-Na, Beast, and other idol groups, and now he directed another group. The main vocal and leader, Yu-Ji, is well known for her skill even before the debut by participating in T-Ara and Hyun-Ah's album. Also, the rapper, LE, sang a duet with Hu-Gak on his song "Everytime I turn on that music".

The group will release the first album "HOLLA" on the 16th and begin to perform with the title song "Whoz That Girl."