The group's original lineup consisted of leader Ashley and members RiSe, EunB, Sojung, and Zuny. They made their debut with the mini-album Code#01 and the lead track "Bad Girl", which were released on March 7, 2013. On September 3, 2014, the group was involved in a car accident that resulted in the deaths of EunB and RiSe.[1][2][3]