OnlyOneOf (온리원오브) is a South Korean boy band formed by 8D Entertainment, debuting on May 28, 2019 with Dot Point Jump. Originally seven members, the group became six after Love’s departure in 2021. Known for their bold art-pop and “ubersexual” concept, OnlyOneOf gained global attention with songs like “Savanna,” “Sage,” and “Libido.” They are praised for heavy member participation in songwriting and production, boundary-pushing performances, and LGBTQ+ representation. From Japanese debuts and solo Underground Idol projects to world tours and albums like Seoul Collection and Things I Can’t Say Love, OnlyOneOf built a strong international fanbase. Their contract with 8D ended in October 2025, with a sub-unit QQQ announced for 2026.
OnlyOneOf Group Profile
- Name (English): OnlyOneOf
- Name (Korean): 온리원오브
- Debut: May 28, 2019
- Genres: Ballad, dance, pop
- Leader: Nine
- Agency: 8D Entertainment
- Fandom (English): lyOn
- Fandom (Korean): 라이온
- Social Media: X, Instagram, Facebook, TikTok, YouTube
KB
- Name (English): Shin Kyu-bin
- Name (Korean): 신규빈
- Birthdate: April 23, 1992
- Age: 33
- Birthplace: Masan City, South Korea
- Nationality: South Korean
- Position: Vocalist, producer
- Height: 180cm
- Weight: 65kg
- Blood Type: AB
- MBTI: ENTP
- Social Media: Instagram
KB (Kyu-bin) is a member of the six-member K-pop boy group OnlyOneOf under 8D Entertainment and the group’s main producer. Using his real name as his stage name, he is known for his creative journey, sharp humor, and artistic sensitivity. Before debut, he explored many paths, including comedy, acting, and public service as a military police officer. KB actively composes, writes, and arranges music for OnlyOneOf, contributing to many albums since debut. As the eldest member, he balances leadership with playful charm, earning love for his wit, emotional depth, and passion for music and storytelling.
RIE
- Name (English): Lee Sung-ho
- Name (Korean): 이성호
- Birthdate: November 6, 1996
- Age: 29
- Birthplace: Daejeon, South Korea
- Nationality: South Korean
- Position: Lead vocalist, lead dancer
- Blood Type: A
- MBTI: ISFP
- Social Media: Instagram
RIE is a member of the six-member K-pop boy group OnlyOneOf under 8D Entertainment, serving as a lead vocalist, lead dancer, and choreography leader. Known for his clean dance lines and soft yet stable vocals, he is an all-rounder who values storytelling in performance. Before debut, RIE experienced a shy childhood, explored acting, dance, and multiple auditions, and persevered through repeated setbacks. His calm ISFP personality contrasts with strong stage charisma. RIE is deeply loved for his sincerity, kindness, detailed choreography work, food enthusiasm, and close, affectionate communication with fans.
YOOJUNG
- Name (English): Lee Tae-yeop
- Name (Korean): 이태엽
- Birthdate: May 29, 1997
- Age: 28
- Birthplace: Gwangju, South Korea
- Nationality: South Korean
- Position: Sub-vocalist, main dancer
- Height: 176cm
- Weight: 62kg
- Blood Type: A
- MBTI: INFP
- Social Media: Instagram
YOOJUNG is a member of the six-member K-pop boy group OnlyOneOf under 8D Entertainment, serving as the group’s main dancer. Trained extensively in dance sports, urban dance, modern dance, and multiple genres, he is known for elegant lines, fast choreography mastery, and expressive stage presence. A graduate of Hanlim Arts High School, Yoojung has worked as a backup dancer, musical performer, songwriter, and solo artist. Beyond performance, he creates self-produced vlogs showcasing his artistic sensitivity. Loved for his delicate personality, professionalism, and dual soft-powerful charm, Yoojung is a core artistic pillar of OnlyOneOf.
JUNJI
- Name (English): Kim Jun-hyung
- Name (Korean): 김준형
- Birthdate: April 6, 1998
- Age: 27
- Birthplace: Incheon, South Korea
- Nationality: South Korean
- Position: Main vocalist, lead dancer
- Height: 181cm
- Weight: 63kg
- Blood Type: B
- MBTI: ENFJ
- Social Media: Instagram
JUNJI is a member of the six-member K-pop boy group OnlyOneOf under 8D Entertainment, serving as a main vocalist and lead dancer. Known for his mysterious image, signature long bangs, and ethereal visuals, he stands out as one of the group’s most recognizable members. JUNJI possesses a clear, emotional vocal tone and strong dance control, often handling high notes and key bridge parts. He actively participates in songwriting and composing, including tracks like cOy and be mine. Beyond music, he is admired for his artistic sensibility, introspective personality, and unique self-produced content that captivates global fans.
Mill
- Name (English): Lee Yong-soo
- Name (Korean): 이용수
- Birthdate: March 30, 1999
- Age: 26
- Birthplace: Gwangju, South Korea
- Nationality: South Korean
- Height: 177cm
- Weight: 61kg
- Blood Type: B
- MBTI: ENFJ
- Social Media: Instagram
Lee Yongsoo (stage name: Mill) is a South Korean actor and former member of the six-member K-pop boy group OnlyOneOf under 8D Entertainment, where he served as the group’s main rapper. Born with a strong passion for sports, especially football, he represented Gwangju in national competitions before shifting his dreams toward entertainment. He joined 8D Entertainment in 2016 after a memorable audition journey and later debuted with OnlyOneOf, contributing as a lyricist and performer. Known for his outgoing personality, athleticism, humor, and fan-favorite self-produced vlog Miri’s Diary, Mill is loved for his authenticity, stage charisma, and versatility across music, acting, and variety content.
NINE
- Name (English): Jeong Uk-jin
- Name (Korean): 정욱진
- Birthdate: December 13, 1999
- Age: 26
- Birthplace: Busan, South Korea
- Nationality: South Korean
- Position: Leader, producer, sub-vocalist
- Height: 176cm
- Weight: 63kg
- Blood Type: O
- MBTI: ISFJ
- Social Media: Instagram
Nine is a South Korean singer, producer, and the youngest member of the six-member K-pop boy group OnlyOneOf under 8D Entertainment. Known as the group’s core beat-maker and songwriter, he actively writes, composes, arranges, and produces many of OnlyOneOf’s albums and highlight medleys using Cubase. Before debut, Nine balanced academics, science clubs, dance activities, and music, later training as an idol after multiple auditions. He released his first self-produced mixtape daisy in 2020 and runs the creative vlog series DAY&NINE. Loved as a high-energy mood-maker, Nine is praised for his sincerity, musical sensitivity, strong fan communication, and deep dedication to his team and art.
OnlyOneOf Members Summary
| Name | Birthdate | Age | Height | Weight | MBTI | Nationality | Position |
|---|---|---|---|---|---|---|---|
| KB (Shin Kyu-bin) | April 23, 1992 | 33 | 180 cm | 65 kg | ENTP | South Korean | Vocalist, Producer |
| RIE (Lee Sung-ho) | November 6, 1996 | 29 | — | — | ISFP | South Korean | Lead Vocalist, Lead Dancer |
| YOOJUNG (Lee Tae-yeop) | May 29, 1997 | 28 | 176 cm | 62 kg | INFP | South Korean | Sub-vocalist, Main Dancer |
| JUNJI (Kim Jun-hyung) | April 6, 1998 | 27 | 181 cm | 63 kg | ENFJ | South Korean | Main Vocalist, Lead Dancer |
| Mill (Lee Yong-soo) | March 30, 1999 | 26 | 177 cm | 61 kg | ENFJ | South Korean | Main Rapper |
| NINE (Jeong Uk-jin) | December 13, 1999 | 26 | 176 cm | 63 kg | ISFJ | South Korean | Leader, Producer, Sub-vocalist |
