(2014 – present)
Rainbow Blaxx (레인보우 블랙) is a sub-unit derived from the South Korean idol group Rainbow. The members chosen for the group are Jaekyung, Woori, Seungah and Hyunyoung. Their début mini-album was RB BLAXX (20 Jan 2014).
The lead single for RB BLAXX was "Cha Cha" and it's music video was released the day before the mini-album.
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