ILLIT (Yunah, Minju, Moka, Won-hee, and Iroha) released a new episode titled "Won-hee's 20-Year-Old Opposition Party" from their self-produced content 'SUPER ILLIT' Season 3 on their official YouTube channel on the 16th. Rather than celebrating Won-hee's transition to adulthood, the members created a unique unit chemistry by conceptualizing the party with an opposite theme. The members added the word 'opposition' above the 'congratulations' message on the banner and created a humorous contract with clauses such as 'maintaining soft cheeks' and 'not losing curiosity,' expressing their desire for Won-hee to remain as one of the team's 'maknae' members. Midway through the party, staff members wearing t-shirts with 'absolutely protect Won-hee's cheeks' suddenly removed the 20 candles from the cake, creating an unexpected situation. The members chased the staff to retrieve the candles, playing a game that resulted in a confusing tally of collected candles. During this process, it was revealed that Iroha was playing the role of a 'spy' for the staff, drawing surprised reactions from the members. Eventually, ILLIT gathered again, lit all 20 candles symbolizing her new age, and shared a moment of celebration by blowing them out together.