We Used To Be Happy

They were initially just strangers who didn't even know each other. Even the lives of their 12 are full of allegations that ordinary human beings cannot face. But they will be united by a mysterious person." I need to complete this group." that's the word that came out of the mysterious man's mouth on a mission to unite the 12. Who is this man's real identity? Why does he want to unite them? Is he able to unite them?

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