I.O.I, reunited for the first time in 10 years, is dominating music charts with their new single 'Suddenly' released on May 19th. The song captures the loneliness of parting with addictive retro dance vibes and gained viral momentum immediately after release, reaching the top of Genie's daily charts within a week. It has maintained the number one position for 17 consecutive days. The chorus lyric 'Suddenly when I laid down to sleep' has become a playful meme among baseball fans as 'Suddenly Yang Ui-ji,' spreading through short-form platforms and social media. This success aligns with the recent retro trend sweeping popular culture, reflecting the group's strong connection with fans. The phenomenon is part of a broader retro craze, with other hits like Choi Ye-na's 'Catch Catch' and the 'Wild Thing' movie OST also achieving success, establishing 80s-inspired retro content as the current music market trend.