On August 12th, SISTAR revealed some behind-the-scenes photos from the set of their comeback music video, "So Cool". The girls went all out for their new music video, emphasizing their glitz and glamor factor. Not only are they wearing jewelry estimated to be worth $2 million USD, but the video also sees a cameo from actor Kevin Were, who earned popularity through his role in 'Secret Garden'.� The music video itself was directed by Joo Hee Sun, who's worked with the girls for their previous title track music videos "Push Push" and "Shady Girl". Transformed into runway models preparing to hit the stage, the girls look like goddesses in their powder rooms. Netizens commented, "Are they models or singers?", "They've become much more gorgeous for this comeback", and "So hot!" [gallery columns=4] Source + Photos: Sports Chosun via Nate