They held auditions for Idol School, and you can see the girls who trained to audition @ 1:57
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The problem was, the girls who were casted for the show were casted way beforehand. So literally all those girls in the stadium were tricked into thinking they had a chance, when really Mnet used them for promo
Absolutely evil 
Anyway, stan Fromis_9, the winning group from Idol School who is now officially a HYBE GG
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