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for BG we have groups like BTS who were nobodies at the beginning and came from like nowhere to be the biggest BG on the planet
what about GG?
for soloists I know IU struggled a lot growing up
the biggest stories are from 1 and 2 gen, I remember some Super Junior or TVXQ were very poor famillies. Kim Jaejoong was abandon by his real familly and given for adoption.
Today most idols come from midle class to rich people