From Summer Sonic to iHeartRadio: LE SSERAFIM's 2026 Festival Run Has No Gaps

LE SSERAFIM and BTS shared a warm photo together backstage at the iHeartRadio Music Festival in Las Vegas on the 18th, and the image landed exactly as expected: fans immediately recognized that two of K-pop's biggest acts had just taken over one of America's most prominent music events on consecutive nights.

BTS performed on the festival's opening night, and LE SSERAFIM (Kim Chaewon, Sakura, Huh Yunjin, Kazuha, Hong Eunchae) followed the next day, the 19th, completing what felt less like a coincidence and more like a relay. The two groups were the only K-pop acts on the full festival bill, which also included Snoop Dogg, Cardi B, and Benson Boone.

A milestone for K-pop girl groups

For LE SSERAFIM, the iHeartRadio slot carries specific weight: the group is the first K-pop girl group to receive an official invitation to the festival. That distinction matters in a year when the group has been methodically collecting exactly these kinds of firsts on the global stage.

The BTS connection adds another layer. The two acts have an established musical relationship: in 2024, Huh Yunjin contributed to a track on J-Hope's solo album, and J-Hope returned the favor by featuring on LE SSERAFIM's SPAGHETTI. Seeing them in the same festival photo, a day apart on the same Las Vegas stage, felt like a natural continuation of that bond.

A festival run with no breaks

The iHeartRadio performance comes at the end of a stretch that has kept LE SSERAFIM moving across continents with very little downtime. Earlier this summer, the group wrapped Summer Sonic 2026 in Japan before flying to the US for BlizzCon 2026 on the 13th, where they closed out the main stage. They also made their third appearance on The Jennifer Hudson Show, a repeated invitation that signals something beyond a one-off promotional visit.

At iHeartRadio, the group brought the performance style they have built their live reputation on: precise, high-energy, and physically committed in a way that reads clearly in a festival setting where you are often winning over a crowd that did not come specifically for you. That combination of technical consistency and stage presence is what keeps getting them onto these bills, and on the 19th in Las Vegas, they had the closing slot to prove it.