SISTAR's Hyolyn and Rainbow's Woori had a sexy back battle recently.
According to Dkpopnews, both girls attended the YOHANIX event in similar fashion choices. Both wore a top that seemed normal but actually showed off their sexy backs.
Whose side are you on?
Photos 1 to 7 show both girls in the backless tops, while the rest show other similar outfits worn by celebs.