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The teaser image they released shows the girls in different outfits -- unlike previous promotions where they tend to wear similar-looking outfits. We can only see the backs of the members, so it's not easy to tell who is who, but two of them have puffy, permed hair! Could they be doing something retro? 

Stay tuned for more teasers! The MV will be released on January 4, 2017,