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On June 29, 2026, Seok Matthew led a new tourism campaign as a Visit Seoul ambassador, highlighting his growing individual brand presence.
On June 23, 2026, Seok Matthew launched his own YouTube channel 'Hey Bye Thew' and opened it with a 4 a.m. theme park dash episode.
The sixth mini album 'Ascend-' marked ZEROBASEONE's first official comeback as a five-member group in May 2026.
'Re-Flow' was introduced as the final special release from the original nine-member era, carrying songs such as 'Running to Future' and 'Lovepocalypse'.
ZEROBASEONE expanded its discography with the first full-length album 'Never Say Never' in September 2025.
On April 12, 2025, Seok Matthew and Park Gun-wook were announced as hosts for an original Japanese variety show, broadening their visibility in Japan.
The fifth EP 'BLUE PARADISE' followed the pre-release 'Doctor! Doctor!' and launched the group's 2025 promotions with 'BLUE'.
'CINEMA PARADISE' paired the title track 'GOOD SO BAD' with a more cinematic concept and fuller EP scale.
The third EP 'You had me at HELLO' expanded ZEROBASEONE's upbeat side with 'Feel the POP' at the center.
'SWEAT' arrived as a pre-release single ahead of the group's third EP and highlighted a brighter seasonal mood.
ZEROBASEONE opened its Japanese chapter with the debut single 'Yura Yura (Unmei no Hana)'.
The second EP 'MELTING POINT' continued the group's momentum with 'CRUSH' as its central comeback track.
ZEROBASEONE officially debuted with the EP 'YOUTH IN THE SHADE' and the title track 'In Bloom'.
The final episode of Mnet's 'Boys Planet' revealed the debut lineup and official group name ZEROBASEONE.
Seok Matthew finished third on 'Boys Planet' with 1,702,174 points and secured his place in ZEROBASEONE.