I.O.I released its third mini album, I.O.I : LOOP, on May 19, 2026 at 6 p.m., making the album the main recorded release tied to the group’s 10th anniversary project and wider I.O.I reunion activity. The album arrived on major music platforms with the title track 갑자기, identified in English-language coverage as “Suddenly,” and followed a promotional rollout that began with new official anniversary social accounts in March.12
The project features nine participating members: Im Na Young, Chungha, Kim Se Jeong, Jung Chae Yeon, Kim So Hye, Yoo Yeon Jung, Choi Yoo Jung, Kim Do Yeon, and Jeon Somi. Kang Mina and Zhou Jieqiong were not listed among the participating members in the anniversary project reporting.1
I.O.I : LOOP Release Details

Swing Entertainment announced in April that I.O.I would release I.O.I : LOOP as the group’s third mini album on May 19, 2026. The same announcement outlined a promotion schedule that included a mood film, concept photos, a tracklist, an album preview, a music video teaser, and an audio snippet.3
The anniversary campaign was first signaled publicly when official accounts using ioi_10th opened on X, Instagram, and TikTok on March 9, 2026. At that stage, album-related information was expected to be released in sequence through the anniversary project channels.1
A mood film for I.O.I : LOOP was released through official social media on April 22. Its closing section displayed the May 19, 2026, 6 p.m. release schedule and the members’ English names. Related reporting also said a pre-release song was planned for May 4 and that tour activity would include Seoul, Bangkok, and Hong Kong.4
Concept promotions continued in May. On May 10, I.O.I released the version A group concept photo through official social media channels, presenting the nine-member lineup associated with the album. The same report described 갑자기 as a synth-pop title track and noted Jeon Somi’s participation in its lyrics.5
| Item | Confirmed detail |
|---|---|
| Album title | I.O.I : LOOP |
| Release date and time | May 19, 2026, 6 p.m. |
| Format | Third mini album |
| Participating members | Im Na Young, Chungha, Kim Se Jeong, Jung Chae Yeon, Kim So Hye, Yoo Yeon Jung, Choi Yoo Jung, Kim Do Yeon, Jeon Somi |
| Number of tracks | Six |
| Title track | 갑자기 / “Suddenly” |
| Seoul concert dates | May 29-31, 2026 |
| Seoul venue | Jamsil Indoor Stadium |
Tracklist and Album Material
The six-track album includes IOI (Where My Girls At), 갑자기, SPF 100+ (Summer Pop Fantasy), IF I, 그때 우리 지금, and 웃으며 안녕. The final track, 웃으며 안녕, was described in the source material as a 2016 archive recording.6
A full-album audio snippet video was released through official channels on May 13, previewing all six songs before the album’s release. Reporting on the preview said Jeon Somi, Chungha, and Yoo Yeon Jung participated in work on some tracks, while Jeon Somi’s lyric participation was specifically connected elsewhere to the title track 갑자기.56
The album release on May 19 was accompanied by the music video for “Suddenly.” English-language coverage described I.O.I : LOOP as the group’s first new release in roughly nine years and tied the music video launch to the 10th anniversary reunion project.2
Concert Schedule After the Album
After the album release, I.O.I is scheduled to hold 2026 I.O.I Concert Tour: LOOP in Seoul from May 29 to May 31, 2026, at Jamsil Indoor Stadium. Earlier reporting described the Seoul concerts as part of wider tour activity that also referenced Bangkok and Hong Kong.34
The album and concert tour share the LOOP title, connecting the recorded release with the live schedule announced around the anniversary project. Available source material confirms the Seoul dates and venue, while the broader Asia tour references are limited to the cities named in the reports.
Quick FAQ
When was I.O.I : LOOP released?
I.O.I : LOOP was released on May 19, 2026 at 6 p.m. as I.O.I’s third mini album.32
How many tracks are on I.O.I : LOOP?
The album has six tracks: IOI (Where My Girls At), 갑자기, SPF 100+ (Summer Pop Fantasy), IF I, 그때 우리 지금, and 웃으며 안녕.6 !I.O.I LOOP album Jamsil Indoor Stadium Seoul concert concept I.O.I : LOOP now stands as the central album release of I.O.I’s 10th anniversary project, with a nine-member lineup, a six-song tracklist, and Seoul concerts scheduled to follow the May 19 comeback.
References
- 아이오아이, 10주년 프로젝트 본격 스타트..SNS 오픈 [공식] (스타뉴스, 2026-03-10)
- I.O.I unveils “Suddenly” MV, marking emotional comeback for 10th anniversary reunion (allkpop, 2026-05-19)
- [공식] ‘데뷔 10주년’ 아이오아이, 5월 19일 컴백 (스포츠동아, 2026-04-21)
- 아이오아이, 9년 만 완전체 비주얼 공개…‘국민 걸그룹’ 컴백 카운트다운 (스포츠동아, 2026-04-22)
- 아이오아이, 미니 3집 ‘I.O.I : LOOP’ 단체 콘셉트 포토 압도적 비주얼 (스포츠경향, 2026-05-10)
- 아이오아이, 미니 3집 ‘I.O.I : LOOP’ 하이라이트 음원 전격 공개 (스포츠경향, 2026-05-14)