SISTAR has just revealed the full MV for their comeback track, "So Cool". As mentioned previously, their concept this time around is "afternoon party girls", and SISTAR gives a unique spin on glamorous girls having fun. The members are seen primping in their wardrobe room, while receiving luxury treatments in one segment, and in the other, they're dashing and leaping hurdles in pretty party dresses, as DJ DOC referees their game. Check it out below! [gallery]