The band originally consisted of six members, who made their official debut with the single "Holla" on November 3, 2016.

[2] Prior to debuting, Eunsung, Woojin, and Sagang were contestants on the Mnet show Voice Kids Korea.

Sagang has appeared as an MC on a game show called 놀자고go[7] on EBS (Educational Broadcasting System),[8] presenting with Ji Min-hyuk, Min Ka-rin (A member of Elris), Hyeju, and Jeong Seong-yeong.

[9] On his and his brother's behalf, Seokcheol held a press conference on October 19, 2018, confirming the abuse allegations.

[11] On October 22, 2018, Media Line Entertainment announced that they terminated the contracts of members Eunsung, Sagang, Woojin and Junwook.