[1] DSP Media announced on November 4 they will debut a new 7-members girl group, called "Rainbow".

[3] On the same day, they released a screencap image of the music video for "Gossip Girl".

[4] During the debut time, they were called the "second KARA" due to both groups are signed on the same label.

They also promoted on the shows KBS's Music Bank, SBS's Inkigayo and Mnet's M!

The song "Gossip Girl" was produced by Hur Youn Won, "Not Your Girl" was produced by Han Sang Won and "Kiss" was composed by SS501's member Park Jung-min.