A long-awaited reunion of I.O.I nearly a decade after their debut has fans asking one key question: Who made it happen? | @ioi_10th/X As it turns out, the answer is Chungha! Chungha | @CH_CHUN9HA/X During a recent appearance on Running Man, Chungha opened up about the behind-the-scenes effort that brought the beloved girl group back…

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