OnlyOneOf (온리원오브) is a South Korean boy group that debuted on May 28, 2019, with Time Leap and Savanna. The group currently consists of KB, Rie, Yoojung, Junji, Mill, and Nine. Former member Love departed from the group in August 2021. The group’s fandom name is lyOn.
OnlyOneOf Members Profile
KB
| Profile | Details |
| Stage Name: | KB (규빈) |
| Birth Name: | Shin Kyubin (신규빈) |
| Position: | Lead Rapper, Vocalist, Visual |
| Birthday: | April 23, 1992 |
| Age: | 34 Years Old |
| Zodiac Sign: | Taurus |
| Birthplace: | Changwon, Gyeongsangnam-do, South Korea |
| Nationality: | Korean |
| Height: | 180 cm (5′ 11″) |
| Weight: | 64 kg |
| Blood Type: | B |
| MBTI: | ENTP |
| Representative Emoji: | 🐦 |
KB Facts
- KB was born in Changwon, South Korea.
- He has an older sister and a younger brother.
- His role in the group is being the “laughter killer.”
- His hobbies include playing the guitar, listening to music, songwriting, and bowling.
- His specialty is doing voice impressions.
- His motto is “Determination + Positivity – Adaptation.”
- His favorite colors are black and purple.
- He is known for his producing and songwriting abilities.
- On August 8, 2025, he confirmed that he had become an independent artist.
Rie
| Profile | Details |
| Stage Name: | Rie (리에) |
| Birth Name: | Lee Sungho (이성호) |
| Position: | Lead Vocalist, Lead Dancer |
| Birthday: | November 6, 1996 |
| Age: | 30 Years Old |
| Zodiac Sign: | Scorpio |
| Birthplace: | Daejeon, South Korea |
| Nationality: | Korean |
| Height: | 175 cm (5’9″) |
| Weight: | N/A |
| Blood Type: | A |
| MBTI: | ISTJ |
| Representative Emoji: | 🐥 |
Rie Facts
- Rie was born in Daejeon, South Korea.
- He has an older sister.
- His group role is being discovered as someone who is unexpectedly funny.
- His hobbies include watching YouTube videos and fishing videos.
- His specialty is ball sports.
- His motto is “You have one life, have no regret.”
- His favorite color is blue.
- He likes chicken and tea.
- When he was younger, he dreamed of marrying the daughter of a fried chicken shop owner so he could eat chicken for free.
- He dislikes cold cucumbers, raw carrots, and sandwiches.
- Fans appreciate his stable vocals and dance skills.
Yoojung
| Profile | Details |
| Stage Name: | Yoojung (유정) |
| Birth Name: | Lee Taeyeob (이태엽) |
| Position: | Main Dancer, Vocalist, Visual |
| Birthday: | May 29, 1997 |
| Age: | 29 Years Old |
| Zodiac Sign: | Gemini |
| Birthplace: | Gwangju, South Korea |
| Nationality: | Korean |
| Height: | N/A |
| Weight: | 56 kg |
| Blood Type: | A |
| MBTI: | INFP |
| Representative Emoji: | 🐰 |
Yoojung Facts
- Yoojung was born in Gwangju, South Korea.
- He has a brother.
- His role in the group is being the “weakling” and helping with cleaning.
- His hobby is watching performances.
- His specialties are animal impressions and girl group dance covers.
- His motto is “My life began with dancing and will end with dancing.”
- His favorite color is white.
- He enjoys communicating with fans.
- He dislikes spicy food.
- He has a habit of talking in his sleep.
- He is widely recognized for his dance skills and expressive performances.
Junji
| Attribute | Details |
| Stage Name: | Junji (준지) |
| Birth Name: | Kim Junhyung (김준형) |
| Position: | Lead Vocalist, Lead Dancer |
| Birthday: | April 6, 1998 |
| Age: | 28 Years Old |
| Zodiac Sign: | Aries |
| Birthplace: | Incheon, South Korea |
| Nationality: | Korean |
| Height: | 181 cm (5’11”) |
| Weight: | 61 kg |
| Blood Type: | B |
| MBTI: | ENFJ |
| Representative Emoji: | 🐱 |
Junji Facts
- Junji was born in Incheon, South Korea.
- He has an older brother.
- His role in the group is being the shy member.
- His hobbies include interpreting song emotions and playing basketball.
- His specialty is freestyle dance.
- His motto is “Be No.1, be someone who gives back to others.”
- His favorite colors are white, black, and beige.
- He dislikes horror movies.
- He enjoys practicing singing during his free time.
- He is known for his iconic long bangs.
- He debuted as a soloist with “be mine” in 2022.
- Junji enlisted in the military on July 28, 2025.
Mill
| Profile | Details |
| Stage Name: | Mill (밀) |
| Birth Name: | Lee Yongsoo (이용수) |
| Position: | Main Rapper, Vocalist |
| Birthday: | March 30, 1999 |
| Age: | 27 Years Old |
| Zodiac Sign: | Aries |
| Birthplace: | Gwangju, South Korea |
| Nationality: | Korean |
| Height: | N/A |
| Weight: | 54 kg |
| Blood Type: | B |
| MBTI: | ENFJ |
| Representative Emoji: | 🐭 / 🐵 |
Mill Facts
- Mill was born in Gwangju, South Korea.
- He has a younger sister.
- He is very skilled at soccer and various sports.
- He was inspired to become an idol by Jay Park.
- He looks up to GOT7.
- His favorite color is sky blue.
- He enjoys playing Mario Kart.
- He believes his special talent is being cute.
- He hopes to appear on sports variety shows in the future.
- Mill debuted as a soloist with “Beat” in 2022.
Nine
| Profile | Details |
| Stage Name: | Nine (나인) |
| Birth Name: | Jung Wookjin (정욱진) |
| Position: | Vocalist, Maknae |
| Birthday: | December 13, 1999 |
| Age: | 27 Years Old |
| Zodiac Sign: | Sagittarius |
| Birthplace: | Busan, South Korea |
| Nationality: | Korean |
| Height: | 177 cm (5′ 10″) |
| Weight: | N/A |
| Blood Type: | O |
| MBTI: | ISFJ |
| Education: | Janseo Elementary School, Namsan Middle School, Gimhae Gyeongwon High School, Kyunggi High School |
| Representative Emoji: | 🦊 |
Nine Facts
- Nine was born in Busan, South Korea.
- He has an older brother and a younger sister.
- He became the group’s leader in December 2023.
- His hobbies are listening to new music and reading fan letters.
- His specialty is making cute laughs.
- His motto is “Consider things from another perspective.”
- His favorite color is yellow.
- He can play the guitar and beatbox.
- He enjoys playing Kirby and Zelda games.
- He dislikes hot weather and spicy foods.
- He stepped down from the leader position in April 2025.
- Fans admire his musical creativity and producing skills.
Former Member Profile
Love
| Profile | Details |
| Stage Name: | Love (러브) |
| Birth Name: | Park Jisung (박지성) |
| Position: | Leader, Main Vocalist |
| Birthday: | January 17, 1994 |
| Age: | 32 Years Old |
| Zodiac Sign: | Capricorn |
| Birthplace: | Pohang, Gyeongsangbuk-do, South Korea |
| Nationality: | Korean |
| Height: | 182 cm (5’11”) |
| Weight: | 63 kg |
| Blood Type: | B |
| MBTI: | ESFJ |
| Representative Emoji: | 🐶 |
Love Facts
- Love was born in Pohang, South Korea.
- He has a younger sister.
- He served as the original leader of OnlyOneOf.
- His hobbies include shopping alone and running while listening to music.
- His favorite color is purple.
- He studied vocal music in high school.
- He trained for approximately six years before debuting.
- He moved to Seoul at age 20 to pursue his dream of becoming a singer.
- He appeared in the music video for ViVi’s “Everyday I Love You.”
- He left OnlyOneOf on August 2, 2021, due to personal reasons.
Read: RIIZE Members Profile.
OnlyOneOf has built a distinctive identity in K-pop through innovative music, creative concepts, and strong artistic involvement. With members KB, Rie, Yoojung, Junji, Mill, and Nine continuing their activities, the group remains a favorite among lyOn fans worldwide and continues to showcase its unique musical style.