Discover everything about Kim Junseo, the multi-talented K-pop idol from 1THE9 and WEi. Learn about his biography, career, and latest updates.
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| Photo of Kim Junseo (김준서). |
Who is Kim Junseo?
Kim Junseo (김준서) (born November 20, 2001, in Ulsan, South Korea) is a South Korean singer, dancer, and actor. He first caught the public’s eye through MBC’s survival show Under Nineteen, where his charisma, vocal talent, and stage presence earned him a place in the final debut lineup of the project group 1THE9.
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| Kim Junseo from 1THE9. |
Kim Junseo Biodata
Kim Junseo Biodata – Profile of the K-pop idol from WEi and 1THE9
| Full Real Name | Kim Junseo |
|---|---|
| Name in Hangeul | 김준서 |
| Stage Name | Junseo |
| Date of Birth | November 20, 2001 |
| Place of Birth | Ulsan, South Korea |
| Occupation | Singer, Dancer, Actor |
| Gender | Male |
| Blood Type | O |
| Height | 180 cm (5’11”) |
| MBTI | ISFP |
| Nationality | South Korean |
| Hobbies | Watching movies, dancing, fashion, taking photos |
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Kim Junseo Biography | K-pop Idol Profile
Biography of Kim Junseo, the talented K-pop idol known for his roles in 1THE9 and WEi.
Kim Junseo (김준서), born on November 20, 2001, in Ulsan, South Korea, is a South Korean singer, dancer, and actor. He is best known as a former member of the project boy group 1THE9 and a current member of WEi under OUI Entertainment.
Early Life & Career Beginnings
Growing up in Ulsan, Junseo developed an early interest in music and performance. His journey into the entertainment industry began when he joined the MBC survival reality show Under Nineteen in 2018. Competing in the performance team, his charming visuals, strong dance skills, and stage charisma quickly caught viewers’ attention. After months of competition, he finished in 9th place, securing a spot in the debut lineup of the winning group, 1THE9.
Debut with 1THE9
Junseo officially debuted with 1THE9 on April 13, 2019, with the mini-album XVIII. The group gained popularity through a variety of promotions, performances, and music releases. Junseo’s role as the visual and a main dancer helped him stand out within the group. 1THE9 remained active until August 2020, when the group disbanded after completing its one-year promotional cycle.
Joining WEi
Shortly after 1THE9’s disbandment, Junseo was announced as a member of OUI Entertainment’s new boy group, WEi. The group debuted on October 5, 2020, with the EP Identity: First Sight. With WEi, Junseo has continued to show artistic growth and versatility. He has participated in several successful releases, music shows, and fan meetings, steadily building a loyal fanbase.
Acting & Personal Growth
In addition to his music career, Junseo has expanded into acting. In 2025, he starred as the male lead Jung Da-on in the youth romance drama Secret Relationships, which was praised for its relatable storyline and strong performances. This marked a new chapter for Junseo, showcasing his talents beyond the stage.
Legacy & Fanbase
Kim Junseo continues to be loved by fans for his calm demeanor, creative spirit, and dedication to his craft. Whether through singing, dancing, or acting, he remains a rising star in the K-pop industry. His journey from a survival show trainee to a multi-talented idol serves as an inspiration to aspiring performers everywhere.
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Kim Junseo Discography | 1THE9 & WEi Music Releases
Explore the full music discography of Kim Junseo — albums, singles, and soundtracks, featuring releases from his time in 1THE9 and WEi, along with notable OST contributions and collaborations.
With 1THE9 (2019–2020)
- XVIII (Mini Album) (2019)
- Spotlight
- Domino
- Our Story
- Blah Blah (Mini Album) (2019)
- Blah
- Friends
- Go!
- Turn Over (Final Album) (2020)
- Bad Guy
- Paradise
- Count
With WEi (2020–Present)
- IDENTITY: First Sight (2020)
- Twilight
- Doremifa
- IDENTITY: Challenge (2021)
- All or Nothing
- Breathing
- IDENTITY: Action (2021)
- Bye Bye Bye
- White Light
- Love Pt.1: First Love (2022)
- Too Bad
- Super Bumpy
- Love Pt.2: Passion (2022)
- Spray
- Higher Ground
- Love Pt.3: Eternally (2023)
- Overdrive
- Be Alright
OST & Other Contributions
- “Stay With Me” – Secret Relationships OST (2025)
- “Dear You” – Special fan song released via YouTube (2023)
Note: This discography includes official albums and notable public releases. For the latest updates, follow Junseo’s activities via Instagram or WEi’s official channels.
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Fun & Interesting Facts About Kim Junseo
Interesting and fun facts about Kim Junseo from WEi and 1THE9.
- Kim Junseo was born on November 20, 2001, in Ulsan, South Korea.
- He was a contestant on the survival show Under Nineteen, where he ranked 9th and debuted with 1THE9.
- After 1THE9 disbanded, he re-debuted as a member of WEi under OUI Entertainment.
- Junseo’s MBTI type is ISFP, often called the “Adventurer.”
- He’s known for his calm personality and mature attitude, despite being one of the younger members.
- Junseo is 180 cm tall (about 5’11”) and has a blood type of O.
- He enjoys watching movies, dressing up in stylish outfits, and photography.
- Junseo starred as the lead in the 2025 youth romance drama Secret Relationships.
- His fans admire his subtle charisma and natural visuals, often comparing him to anime characters!
- He often takes behind-the-scenes photos of his group members, showcasing his photography skills.
- Junseo likes cats and has expressed interest in adopting one someday.
- He participated in writing lyrics and conceptual ideas for WEi’s albums.
- Junseo has said his dream is to continue growing as an artist and actor.
- His favorite colors are blue and beige, and he loves soft, minimal fashion aesthetics.
- Fans gave him nicknames like “Quiet Prince” and “Chic Maknae.”
- Instagram: @__k_junseo
- Hometown: Ulsan, South Korea
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Check Kim Junseo’s journey through his official Instagram and WEi’s music releases to stay updated on his latest projects and appearances.