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An idol group is subjected to the worst aspects of the industry, things that have become standard practice. One member is caught holding hands with a boyfriend and is forced by producers to publicly apologize. They must follow strict rules to maintain an image. Eventually they grow tired of this and rebel against the system. They abandon their label and strike out on their own. In an effort to give the finger to the industry standards they strip and perform nude. The lyrics to their songs openly admit their sexual histories and their intent to continue living their best lives. They refuse to pretend to be pure and call out other idol groups for being liars. The public doesn't know what to make of this but they develop a niche following that gradually expands. Suddenly other idol groups follow their lead and the industry bigwigs are not happy and try to undermine their newfound respect with underhanded tactics.
For 3DPD look up National Idol Unit.