LE SSERAFIM has found itself at the center of a heated online debate after some viewers accused the group of using pre-recorded vocals while appearing to sing live during their recent performance at Summer Sonic 2026.

On August 16, the girl group took the stage at Summer Sonic 2026 in Tokyo, performing a one-hour set featuring some of their biggest hits. The performance initially received praise for the members’ confident stage presence, energy, and ability to command a large festival crowd.

However, an unexpected controversy quickly overshadowed the positive reactions.

A clip from the official livestream began circulating online, with some viewers claiming that LE SSERAFIM had attempted to make pre-recorded vocals sound like genuine live singing. The main point of criticism came from a moment involving Yunjin and Sakura, who appeared to turn their microphones toward the audience while their vocal tracks seemingly continued at the same volume.

The clip rapidly gained attention, reportedly approaching two million views in less than a day, and sparked a wave of criticism directed not only at the members but also at their agency, HYBE.

Some netizens questioned whether the performance had actually been live and accused the group of misleading viewers by creating the impression that they were singing in real time.

The controversy, however, was far from one-sided.

Fans quickly began comparing the official livestream footage with videos recorded by people attending the festival. According to supporters, the audience-recorded clips tell a noticeably different story.

Several fan-recorded videos appeared to capture the members’ live vocals much more clearly, with their voices audible over the backing track. Fans argued that the difference was likely caused by the livestream’s audio mix rather than the group deliberately pretending to sing.

In other words, while the official broadcast may have made the backing vocals sound unusually prominent, people physically present at the venue could hear the members’ voices differently.

This has led to a growing debate over how much responsibility should be placed on the performers versus the production team responsible for broadcasting a festival performance.

The controversy also highlights one of the biggest challenges faced by K-pop acts performing at large international festivals. The sound heard by people inside the venue can differ significantly from what viewers receive through an official livestream, particularly when microphones, backing tracks, crowd noise and broadcast mixing are handled separately.

For now, LE SSERAFIM has not publicly addressed the accusations, and there has been no confirmation that the members intentionally used pre-recorded vocals to imitate a live performance.

🌟 LE SSERAFIM takes over SUMMER SONIC 2026 Tokyo — [FULL SET] pic.twitter.com/r4eJEABRAg

— fimloops (@fimloops) August 16, 2026

As the debate continues, fans remain divided. Critics believe the livestream footage raises legitimate questions about the authenticity of the performance, while supporters argue that audience recordings provide important context that should not be ignored.

Meanwhile, BLACKPINK’s Jennie, who also performed at Summer Sonic 2026, faced her own wave of online discussion surrounding her performance earlier in the festival weekend.

With clips from the event continuing to spread across social media, the controversy surrounding LE SSERAFIM is unlikely to disappear anytime soon.