On January 20, the sub-unit of girl group Rainbow comprised of Kim Jae Kyung, Go Woo Ri, Oh Seung Ah, and Cho Hyun Young revealed their new song "ChaCha" and its music video.

The music video setting is the secretive backstage dressing room of the Rainbow BLAXX members transformed as showgirls. It is spinoff of the fable "The Goose That Laid the Golden Eggs". In it, it humorously portrays that the more the girls eat something sweet and become beautiful, the more they vomit jewels.

The eye-catching wardrobe for this song includes a trifecta of sexiness like corsets, garter belts, and whips. The focal point of the music video is the "whip dance", where the girls take the whips in both hands and continuously moving their hips. The creative arts team DIGIPEDI produced the music video.

"ChaCha" was co-written by Yoon Sang and East4a. It has a retro disco-dance vibe with vibrant lyrics. Fans are already wondering how this girl group will rattle the cage of others competing for the lead in sexiness.

Meanwhile, Rainbow BLAXX released their new song and music video around noon on January 20, and showcased their comeback stage that evening at the Seoul Gwanghwamun Olleh Square.