Yoon SeoYeon
Leader of ASSEMBLE25, Leader of LOVElution, Leader of Neptune, Vocalist. One of 24 women proving that a member list can double as cardio.
| Stage name | Yoon SeoYeon |
|---|---|
| Birth name | Yoon Seoyeon (윤서연 / ユン・ソヨン / 尹舒姸) |
| Birthday | August 6, 2003 |
| Nationality | Korean |
| S number | S1 (ATOM 01) |
| Role | Leader of ASSEMBLE25, Leader of LOVElution, Leader of Neptune, Vocalist |
| Height | 160 cm (5’3″) |
| MBTI | ISFP |
Before tripleS
She is from Jung-gu, Daejeon, South Korea. Seoyeon was the very first member of tripleS Her most famous quote about tripleS is “Isn’t 24 too many?” Seoyeon doesn’t drink coffee.
tripleS career
Yoon SeoYeon is S1 (ATOM 01) in tripleS, MODHAUS’s rotating 24-member group. The number is reveal order, not a ranking. Members move through full-group releases and smaller Dimensions selected through the Cosmo voting system.
Her recorded unit and debut trail includes ASSEMBLE.
Why S1 matters
SeoYeon was the first member revealed for tripleS, making her the public entry point into a system that initially sounded more like a technology pitch than an idol group. Early SIGNAL episodes documented training, dorm life and the gradual arrival of new members before the final 24-person lineup existed. That archive gives her unusual historical weight: viewers watched the project’s vocabulary, habits and interpersonal structure form around the first resident rather than meeting a finished team.
Her career is still a group career. Participation in Dimensions, full-group releases, variety content and member-centered videos does not create a separate solo music catalog. This canonical page therefore belongs in the Member directory only.
Music and unit map
SeoYeon debuted musically through Acid Angel from Asia and later participated in full-group tripleS releases including ASSEMBLE. The Dimension system changes collaborators and concepts without ending membership in the larger group. Her performance record should be read across those units, not as a series of unrelated debuts.
YouTube tracking history
tripleS official YouTube channel, SIGNAL archive and SeoYeon performances
Daily gain: baseline collection pending · Total views: collection pending
Sources
Fandom file
Fandom: WAV. Digital photocards: Objekts. Voting currency: COMO. Fan votes: Gravity. Yes, the vocabulary sounds like a science-fiction game because this group refuses to be normal.
Official links
Members are linked through the official group accounts unless MODHAUS provides a separate public account.