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KpopStarzCo-Ed K-Pop The Next Big Thing? SM Subsidiary BALJUNSO To Debut New ...KpopStarzBut it may also be cursed with the same curse that every other co-ed group in K-Pop history has had. The two most popular ones were Sunny Hill and Co-Ed, both of which have been reformed so that they are all only filled with one gender- Sunny Hill's ...