SeoYeon
μ€μμ° Β· HamHam
June 8, 2003 Korean 160 cm Not disclosed Type B ISFP Leo
Yoon Seo-yeon, known on stage as SeoYeon, is a South Korean singer, dancer, and actress recognized as the very first revealed member (S1) of MODHAUS's 24-member girl group tripleS. Born August 6, 2003 in Daejeon, she had no prior idol training and was instead discovered through her singing videos on Instagram before being unveiled on May 1, 2022 β the date now celebrated as tripleS's official anniversary. SeoYeon debuted with the full group on ASSEMBLE in 2023, then went on to join sub-units +(KR)ystal Eyes, ACID EYES, LOVElution, and later became leader of the 2025 sub-unit neptune. She has also branched into acting and variety, appearing on Queendom Puzzle and starring in the web-drama What Summer Likes!. An ISFP nicknamed "HamHam" for her hamster-like visuals, SeoYeon is known for her warm, honest personality, steady vocal growth, and natural leadership, often representing tripleS in interviews and events. As the member whose reveal launched the entire tripleS project, she is widely seen by fans, or WAV, as the emotional foundation of the group. Her journey from an untrained hopeful to a leading voice of one of K-pop's most experimental, fan-directed idol groups reflects tripleS's founding idea that any girl, given the chance, can become "the idol of all possibilities."
Story
Biography
Yoon Seo-yeon, promoting under the name SeoYeon, is a South Korean singer, dancer, and actress, and the very first revealed member (S1) of the 24-member K-pop girl group tripleS, formed by MODHAUS. Born on August 6, 2003, in Daejeon, South Korea, SeoYeon had no prior idol training experience before joining the group — she was discovered on Instagram after uploading videos of herself singing, and was revealed as tripleS’s S1 on May 1, 2022, a date that now marks the group’s official anniversary.
SeoYeon moved into tripleS’s very first HAUS on May 9, 2022, marking the start of the group’s long-running reality series, SIGNAL, and the beginning of the entire tripleS project. She officially debuted with the group’s first mini album, ASSEMBLE, on February 13, 2023, led by the single “Rising.” She went on to become a founding member of the sub-unit +(KR)ystal Eyes, debuting with the mini album AESTHETIC and its title track “Cherry Talk” in May 2023, followed by the merged unit ACID EYES and the sub-unit LOVElution, whose mini album MUHAN and title track “Girls’ Capitalism” she promoted in August 2023.
Beyond music, SeoYeon appeared as a contestant on Mnet’s female idol survival program Queendom Puzzle alongside fellow member JiWoo in 2023, and later took a lead role in the web-drama What Summer Likes! in 2024. She promoted with the full 24-member tripleS on the group’s first and second studio albums, ASSEMBLE24 (“Girls Never Die”) and ASSEMBLE25 (“Wake Up (Are You Alive)”), and in 2025 was revealed as the leader of tripleS’s new sub-unit neptune, which debuted with the mini album Beyond Beauty and single “Fly Up.”
Nicknamed “HamHam” for her hamster-like visuals, SeoYeon is celebrated by tripleS’s fandom, WAV, for her warm, honest personality, steady vocal growth, and strong leadership presence, often representing the group despite not holding an official leader title. As the member whose reveal began the entire tripleS project, she remains regarded as the emotional core and foundation of the group.
Profile
Basic Information
| Stage Name | SeoYeon |
| Full Birth Name | Yoon Seo-yeon (μ€μμ°) |
| Date of Birth | August 6, 2003 |
| Birthplace | Seonhwa-dong, Jung-gu, Daejeon, South Korea |
| Hometown | Daejeon, South Korea |
| Nationality | Korean |
| Height | 160 cm (5'3"") |
| Weight | Not disclosed |
| Blood Type | B |
| Zodiac Sign | Leo |
| MBTI | ISFP |
| Education | Regular student prior to debut; no formal idol trainee background |
| Agency | MODHAUS (2022βpresent) |
| Debut | February 13, 2023 (tripleS, "ASSEMBLE") |
| Languages | Korean |
| Nicknames | HamHam |
| Hobbies | Watching movies (especially Marvel & Harry Potter), lying down, rewatching favorite films |
| Favorite Color | Blue and white |
| Ideal Type | Not publicly specified |
Membership
Groups & Positions
TripleS
MODHAUS
Vocalist Leader (neptune) Actress
2022 β Present
The Lineup
Group Members β TripleS
Yoon SeoYeon
Vocalist Β· Unofficial Leader
This Idol
Jeong HyeRin
Main Dancer
Lee JiWoo
Main Vocalist
Kim ChaeYeon
Vocalist
Kim YooYeon
Leader Β· Visual
Kim SooMin
Vocalist
Kim NaKyoung
Vocalist Β· Dancer Β· Rapper
Gong YuBin
Vocalist
Kaede
Vocalist Β· Dancer
Seo DaHyun
Vocalist
Kotone
Main Rapper
Kwak YeonJi
Vocalist
Nien
Rapper
Park SoHyun
Vocalist Β· Producer
Xinyu
Visual
Mayu
Vocalist
Lynn
Vocalist
JooBin
Vocalist
Jeong HaYeon
Vocalist
Park ShiOn
Vocalist
Kim ChaeWon
Vocalist
Sullin
Vocalist
SeoAh
Vocalist
JiYeon
Vocalist
Journey
Career Timeline
2022
Revealed as S1
Unveiled as the very first member of tripleS on May 1, 2022, a date now marking the group's official anniversary.
2022
Moved into HAUS 1
Moved into tripleS's first HAUS on May 9, 2022, starting the group's long-running reality series, SIGNAL.
2023
tripleS Official Debut
Debuted with the full group's first mini album "ASSEMBLE" and lead single "Rising" on February 13, 2023.
2023
+(KR)ystal Eyes Debut
Debuted with the sub-unit +(KR)ystal Eyes, releasing the mini album "AESTHETIC" and title track "Cherry Talk" on May 4, 2023.
2023
Queendom Puzzle
Announced as a contestant on Mnet's idol survival show Queendom Puzzle alongside member JiWoo; eliminated in episode 7.
2023
ACID EYES & LOVElution
Joined sub-unit ACID EYES for "Cherry Gene" (July) and debuted with LOVElution's "MUHAN," title track "Girls' Capitalism" (August).
2024
ASSEMBLE24 Full-Group Debut
Promoted with the full 24-member tripleS on the group's first studio album "ASSEMBLE24" and single "Girls Never Die."
2024
Lead Role in Web-Drama
Took the lead role in the web-drama "What Summer Likes!," revealed on September 18, 2024.
2025
ASSEMBLE25 Promotions
Promoted with tripleS's second full-group studio album "ASSEMBLE25" and single "Wake Up (Are You Alive)" from May 12, 2025.
2025
Leader of neptune
Revealed as the leader of new sub-unit neptune on September 3, 2025.
2025
neptune Debut
Debuted with neptune's mini album "Beyond Beauty" and single "Fly Up" on November 24, 2025.
Music
Discography
π
ASSEMBLE
EP
2023
π
ASSEMBLE24
Studio Album
2024
π
ASSEMBLE25
Studio Album
2025
π
ASSEMBLE26 pt.1
Studio Album
2026
π§
Rising
Digital Single
2023
π§
Girls Never Die
Digital Single
2024
π§
Wake Up (Are You Alive)
Digital Single
2025
Recognition
Awards & Achievements
Best New Female Artist
Mnet Asian Music Awards (MAMA)
2023
1st Music Show Win β Girls Never Die
The Show
2024
Did You Know?
Trivia & Fun Facts β¨
β
She was born in Seonhwa-dong, Jung-gu, Daejeon, South Korea, on August 6, 2003.
β
She had no prior idol trainee experience before joining tripleS, unlike most of her groupmates.
β
She was discovered by MODHAUS through videos of herself singing that she posted on Instagram.
β
She was revealed as tripleS's very first member (S1) on May 1, 2022, which is now celebrated as the group's official anniversary.
β
Because she was the first member, she lived alone in the HAUS for about two weeks before other members joined.
β
Her nickname "HamHam" comes from fans who thought her visuals resembled a hamster.
β
She previously had a nickname referencing a dog-like appearance early in her promotions.
β
Her favorite colors are blue and white.
β
Her role model is actress Zendaya.
β
She has a talent for cooking steamed eggs (gyeran-jjim), which fellow member HyeRin has praised.
β
She gets scared easily, especially by horror movies.
β
Her hobbies include watching movies, especially rewatching her favorites.
β
Her favorite movies include "The Greatest Showman" and "Black Panther."
β
She is a big fan of the Marvel Cinematic Universe and Harry Potter.
β
Her favorite fictional characters include Spider-Man, Iron Man, and Aslan from The Chronicles of Narnia.
β
She dislikes drinking coffee, mint chocolate, eggplants, and warm, soft-cooked vegetables.
β
She prefers wearing loose, comfortable clothing.
β
She has a habit of sleeping with the light on and snoring.
β
She usually goes to sleep around midnight and wakes up between 7 and 8 a.m.
β
She considers her best features to be her eyes, eyebrows, and a mole on her nose.
β
She served on her school's student council for eight years before becoming an idol.
β
Her favorite music genre is Western hip-hop.
β
She appeared on the survival show Queendom Puzzle alongside fellow member JiWoo.
β
She took on a lead acting role in the web-drama "What Summer Likes!" in 2024.
β
She was revealed as the leader of tripleS's sub-unit neptune in September 2025.
β
She has been a member of sub-units +(KR)ystal Eyes, ACID EYES, LOVElution, and neptune.
β
Despite not holding an official "leader" title for the main group, she often represents tripleS at events.
β
She has 11-pack abs, a surprising contrast to her soft, cute public image.
β
Fans have noted her strong sense of humor and expressive reactions during SIGNAL episodes.
β
She is widely seen by fans as the emotional core of tripleS, since her reveal began the entire project.
The Fandom
Fan Club & Fan Name π
Official Fan Name
WAV
WAV is the official name for tripleS fans, representing the wave of support that connects the 24 members with their global audience. WAVs take part directly in the group's decisions through "Gravity" votes, choosing sub-unit line-ups, concepts, and content, making tripleS one of the first K-pop groups built around fan-directed, decentralized promotions.
Official Fan Color
Dodger Blue (Individual Member Color)
Dodger Blue is SeoYeon's official individual representative color within tripleS, reflecting her status as S1, the group's very first revealed member.
Official Light Stick
heartS
The official tripleS light stick, heartS, was chosen by WAV fans through the "Gravity" light-stick event and formally unveiled on May 21, 2024. Its heart-shaped modular design lights up in different colors and modes, letting WAV cheer for the full group, individual sub-units, or a single member during shows.
Fan Community Platform
Cosmo: The Origin
tripleS's dedicated fan platform and app, Cosmo: The Origin, is where WAV collects digital "Objekt" photocards, joins Gravity votes, and follows official updates, livestreams, and community posts from the group.
Stay Connected
Social Media
Photos
Gallery π·
