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SEOUL, SOUTH KOREA - JUNE 21: Girl group SISTAR attends the '2016 SISTAR 4th Mini-Album Comeback Showcase' In Seoul on June 21, 2016 in Seoul, South Korea. (Photo by Han Myung-Gu/WireImage)

SEOUL, SOUTH KOREA - JUNE 21:  Girl group SISTAR attends the '2016 SISTAR 4th Mini-Album Comeback Showcase' In Seoul on June 21, 2016 in Seoul, South Korea.  (Photo by Han Myung-Gu/WireImage)