On June 16th, a new photo of Rainbow's Woori and her seven doppelgangers was uploaded onto Rainbow's official Facebook page, leading fans to speculate that it's the concept for their follow-up promotions. Rainbow wrote, "Into your sweet dreams. Coming soon. 'Sweet Dream.'" Fans commented, "Are they gearing up for their follow-up promotions now?", "Will this be a solo promotion for Woori?", and "I have a feeling it's going to be a slow ballad this time around!" Source + Photos: Sports Chosun via Naver