A second subunit, named Rainbow Blaxx, was formed in January 2014 consisting of Jaekyung, Woori, Seungah and Hyunyoung.[17] Their special album, RB Blaxx, was released on Janauary 20, 2014.[18] The music video for the title track, "Cha Cha", was directed by Digipedi and was the fourth-most viewed K-pop music video globally in January 2014.[19][20] The music video, as well as the song's choregraphy, drew controversy for being "too sexual".[21][22]