Legendary girl group I.O.I has made a dramatic comeback after a 9-year hiatus, appearing on the variety show 'Knowing Bros' where members shared emotional stories about their reunion. Members including Jeon So-mi mentioned physical changes, while Lim Na-young reflected on memory loss. Kim Se-jeong shed tears upon receiving a wreath sent by Na-young's mother. The group maintained active communication through a group chat for 10 years before reunion and celebrated Christmas together at either So-mi's or Chung-ha's homes annually, demonstrating their strong bonds. Their comeback song topped music charts, showcasing their enduring influence. However, members expressed sadness as the 'Knowing Bros' appearance marks the final schedule of their Korean activities. The episode also humorously revealed the manager's obvious favoritism toward Choi You-jung.