MONSTA X took the stage as headliners at the '2026 Seoul Park Music Festival' held at the Olympic Park 88 Lawn in Seoul on the 21st. The members opened their performance with 'N the Front,' 'Do What I Want,' and 'Tuscan Leather,' displaying powerful energy and explosive performances from the start. They showcased tracks from their recently released American studio album 'Unfold,' including 'baby blue' and 'growing pains.' Through performances of 'Autobahn,' 'Burning Up,' 'ZONE,' 'Love Killa,' 'Shoot Out,' and 'Torrential Rain,' they created a unified atmosphere with fan chants and audience cheers, and responded to multiple encore requests by performing 'ZONE' and 'Stand Up,' demonstrating their musical prowess. Additionally, Kihyun appeared as a solo artist the previous day, pre-releasing 'Lazy Day' from his upcoming mini album 'BORDERLINE' (to be released on July 7th), while Jooheon participated in 'Rap Beat 2026,' performing his mini album title track 'STING' and showcasing his strong presence as a festival performer.