dsp media announced in november 4 they will debut a new 7-members girl group, called "rainbow". on november 6, they released another teaser image of the girls and revealed their names, ages, respective colors and the name of their debut ep. on the same day, they released a screencap image of the music video for "gossip girl". during the debut time, they were called the "second kara" due to both groups are signed on the same label. the music video for "gossip girl" was released in november 12, along with the ep release.