ZEROBASEONE will give “Customize” its first stage performance at KCON Japan 2026 on May 10, placing Park Geonwook’s first self-composed song before audiences ahead of the group’s next album release. The performance is set for Makuhari Messe in Chiba, Japan, where KCON Japan 2026 runs from May 8 to 10.1
The song is included on ZEROBASEONE’s sixth mini album, “ASCEND-,” which is scheduled for release on May 18 at 6 p.m. KST.1 Reports describe “Customize” as a pop-rock-based track for which Park Geonwook wrote both lyrics and music, marking his first original composition for the group.1
“Customize” Gets First Stage at KCON Japan 2026

The May 10 premiere gives “Customize” a public performance slot before the full release of “ASCEND-.” JoyNews24 also identified the track as a B-side from the upcoming sixth mini album and reported that it will be unveiled during KCON Japan 2026.2
Park Geonwook framed the song as a track written with the group’s performance in mind. In a live broadcast quote carried by FANNSTAR / The Fact, he said, “From the beginning, I wrote the song thinking it would be cool if all five of us sang it.”1 JoyNews24 also quoted him as saying it is “a song only ZEROBASEONE can do.”2
The focus on the five-member performance is part of the reporting around the track’s first reveal, though the available source material does not provide further details about the stage arrangement, choreography, runtime, or whether the KCON version will differ from the album version. What is confirmed is the timing: “Customize” is being introduced on stage on May 10, and the album containing it follows on May 18.
ASCEND- Track Details and Event Facts
ZEROBASEONE published the tracklist for “ASCEND-” on official social media on May 4, with KSTATION TV reporting seven songs: “Top 5,” “Intro.,” “V for vision,” “Customize,” “Exotic,” “Changes,” and “Zero to hundred.”3 JoyNews24 separately reported that the album includes seven tracks and named “TOP 5” as the title song.2
The album credit is also notable within the group’s discography. KSTATION TV reported that “Customize” is Park Gunwook’s first self-composed song and his first album credit since debut.3 FANNSTAR / The Fact described the track as Park Geonwook’s first original composition for the group, with lyrics and music credited to him.1
| Item | Confirmed detail |
|---|---|
| Song | “Customize” |
| Artist | ZEROBASEONE |
| Song credit | Park Geonwook wrote lyrics and music for the pop-rock-based track |
| First performance | May 10 at KCON Japan 2026 |
| Event venue | Makuhari Messe, Chiba, Japan |
| Event dates | May 8 to 10, 2026 |
| Album | “ASCEND-,” ZEROBASEONE’s sixth mini album |
| Album release | May 18, 2026, at 6 p.m. KST |
| Album track count | Seven tracks, including title song “TOP 5” |
KCON Japan 2026 itself is scheduled from May 8 to 10 at Makuhari Messe in Chiba, Japan, a venue and date range confirmed in CJ ENM’s first lineup announcement.4 CJ ENM later announced expanded FESTIVAL GROUNDS programming for the 2026 event, including K-beauty, K-food, K-story, K-cinema, screenings, and fan-focused programs under the theme “Walk in SOUL CITY.”5
ZEROBASEONE’s connection to the event had already been confirmed before the “Customize” performance news. CJ ENM announced Sung Han-bin of ZEROBASEONE as KCON’s first Global Ambassador, with the role beginning at KCON Japan 2026 in Chiba and continuing through KCON LA 2026 in August.6 The same update also confirmed ZEROBASEONE as part of the KCON Japan 2026 artist lineup.6
Quick FAQ
When will ZEROBASEONE first perform “Customize”?
ZEROBASEONE will first perform “Customize” on May 10 at KCON Japan 2026, held at Makuhari Messe in Chiba, Japan.1
When is the album containing “Customize” released?
“Customize” is included on ZEROBASEONE’s sixth mini album “ASCEND-,” scheduled for release on May 18, 2026, at 6 p.m. KST.1 !ZEROBASEONE KCON Japan 2026 lineup Customize premiere concept The confirmed schedule places “Customize” in a two-step rollout: a KCON Japan 2026 stage premiere on May 10, followed by the wider “ASCEND-” album release on May 18. For ZEROBASEONE, the track also marks a documented first album credit and first self-composed group song for Park Geonwook.
References
- ZEROBASEONE, on the 10th, will premiere Park Geon-wook's first self-composed song "Customize" on the stage of 'KCON JAPAN 2026' for the first time. (FANNSTAR / The Fact, 2026-05-05)
- '5인 재편' 제로베이스원, 'KCON JAPAN'서 신곡 최초 공개 (JoyNews24, 2026-05-05)
- ZEROBASEONE : Tracklist, first involvement of PARK GUN WOOK (KSTATION TV, 2026-05-04)
- KCON JAPAN 2026 Unveils 1st Lineup of Performing Artists (CJ Newsroom, 2026-01-29)
- KCON JAPAN 2026 Unveils Expanded FESTIVAL GROUNDS (CJ Newsroom, 2026-05-06)
- KCON Names ZEROBASEONE’s Sung Han-bin as First Global Ambassador (CJ Newsroom, 2026-02-26)