"Biggest Fan" is a song recorded by South Korean singer Irene for her first studio album of the same name. It was released as the album's lead single by SM Entertainment on March 30, 2026.
Background and release On February 27, 2026, SM Entertainment announced that Irene would be releasing her first studio album in March 2026. On March 8, it was announced that Biggest Fan would be released on March 30. It will contain ten tracks, including the lead single of the same name. On March 27, the music video teaser was released. The song was released alongside its music video and the album on March 30.
Composition "Biggest Fan" was written by Liljune, composed and arranged by Evan Gartner with Grace Baer and Samuel Preston contributing to the composition. It is a pop dance song characterized by an "upbeat groove bass" with lyrics "delivering the message of becoming each other's fans and cheering for one another with a cheerful and confident attitude".
Commercial performance "Biggest Fan" debuted at number 129 on South Korean's Circle Digital Chart in the date issue dated March 29–April 4, 2026; on its component charts, the song debuted at number three on the Circle Download Chart, and number 179 on the Circle BGM Chart.
Promotion Irene performed the song on four music programs in the first week: Mnet's M Countdown on April 2, KBS's Music Bank on April 3, MBC's Show! Music Core on April 4, and SBS's Inkigayo on April 5. In the second week, she performed the song on four music programs: Mnet's M Countdown on April 9, KBS's Music Bank on April 10 where she won first place, MBC's Show! Music Core on April 11, and SBS's Inkigayo on April 12.
Accolades + Music program awards for "Biggest Fan" Program Date Music Bank April 10, 2026
Credits and personnel Credits adapted from the album's liner notes.
Studio SM Aube Studio – recording, digital editing SM Wavelet Studio – recording SM Blue Ocean Studio – mixing 821 Sound – mastering
Personnel SM Entertainment – executive producer Irene – vocals, background vocals Liljune – lyrics Evan Gartner – composition, arrangement Grace Baer – composition, background vocals Samuel Preston – composition Kenzie – vocal directing Kim Hyo-joon – recording, digital editing Kang Eun-ji – recording Kim Cheol-sun – mixing Kwon Nam-woo – mastering
Charts + Chart performance for "Biggest Fan" Chart (2026) Peakposition South Korea (Circle) 129
Release history + Release history for "Biggest Fan" Region Date Format Label Various March 30, 2026
References