IOI, formed through Mnet's 'Produce 101' season 1, has celebrated its 10-year reunion. The group, which was a significant part of K-pop history, has reconvened for a special concert. Member Kim Se-jeong expressed her happiness, stating she cries every day due to her current state of happiness. - IOI was formed through 'Produce 101' season 1. - The group celebrated its 10-year reunion with a concert. - Kim Se-jeong mentioned being overly happy, leading to daily tears of joy. Q: Why is this trending? A: IOI is trending because of their highly anticipated 10-year reunion and successful concert. | IOI, formed through Mnet's 'Produce 101' season 1, has celebrated its 10-year reunion. The group, which was a significant part of K-pop history, has reconvened for a special concert. Member Kim Se-jeong expressed her happiness, stating she cries every day due to her current state of happiness. - IOI was formed through 'Produce 101' season 1. - The group celebrated its 10-year reunion with a concert. - Kim Se-jeong mentioned being overly happy, leading to daily tears of joy. Q: Why is this trending? A: IOI is trending because of their highly anticipated 10-year reunion and successful concert.