I.O.I, a project group that reunited for the first time in 10 years, achieved the number one spot on Melon's Top 100 Monthly Chart in June with their track 'Suddenly.' Although the comeback was not specifically aimed at topping the chart, the song's addictive melody and nostalgic appeal resonated strongly with listeners. Following their reunion, I.O.I released music and held concerts to address fans' longing, with the group expressing hopes that this reunion would become 'the warmest happy ending and a new beginning' for everyone. This achievement demonstrates that the group maintains significant market viability beyond mere nostalgia consumption. CORTIS's 'REDRED' ranked second, while ILLIT's 'It's Me' climbed two positions from the previous month to secure third place.