SeoYeon
윤서연- Name
- Yoon Seo-yeon
- Born
- 6 August 2003
Revealed as S1, the first member; voted into the 2026 ballad unit tripleS Aura.
Their story
Twenty-four girls, one by one
MODHAUS built tripleS around an unusual idea. The members were revealed one at a time, each with a serial number from S1 to S24. Fans then vote in the COSMO app on who forms a unit and which song leads. The first unit, Acid Angel from Asia, released the EP ACCESS in 2022. The full group debuted the following February with ASSEMBLE. Even its title track, "Rising", was chosen by fans in a head-to-head vote.
All 24 in one practice room
The group grew in steps. In 2023 the units LOVElution and EVOLution debuted with their own EPs, and tripleS won Best New Female Artist at the MAMA Awards. The real turning point came in May 2024, when JiYeon, the 24th and last member, arrived with ASSEMBLE24. While preparing it, all 24 shared one dorm and one practice room. Its lead single "Girls Never Die" gave them their first music show win, on The Show. Two years later SoHyun still pointed to it as the kind of song that moves fans' hearts.
Ballads, retro and growing pains
Because the units keep changing, tripleS can cover many styles at once. Aria sings ballads, the unit sun released the retro track "Bubble Gum Girl", and Visionary Vision took its own win with "Hit the Floor". The full-group songs share one theme. "Girls Never Die", "Are You Alive" and "Baby Flower" speak to girls going through the growing pains of youth. With LOVE & POP pt.1, SeoAh said, the group showed a more cheerful side.
Where they are now
All 24 members are active. Late in 2025 they returned as msnz, four units of six on the album Beyond Beauty. "Baby Flower" from LOVE & POP pt.1 brought their first Music Bank win in June 2026, and the album had the best first-week sales in the group's history. The ANDLESS world tour opened in Seoul in October, with six North American dates in November. The single "Andless" came out that same October.