During the latter half of 2010, rumors began to circulate through Korean media sites that E-Tribe, the producers behind breakthrough hits such as Girls' Generation's "Gee" and Lee Hyori's "U-Go-Girl", were planning to launch a new girl group.
Selama paruh kedua 2010, rumor mulai beredar melalui situs media Korea bahwa E-Tribe, para produsen di belakang hit terobosan seperti "Gee" oleh Girls' Generation dan Lee Hyori dengan "U-Go-Girl", berencana untuk meluncurkan girlband baru.