[UPDATE] OnlyOneOf Members Age & Birthday Calendar with Photo
KPOP OFFICIAL – Last Updated March 3, 2023 KST
OnlyOneOf (온리원오브) is a six-member boy group under 8D Entertainment. OnlyOneOf members consist of KB (규빈), Rie (리에), YooJung (유정), JunJi (준지), Mill (밀), and Nine (나인). They debuted on May 28, 2019, with their first mini album Dot Point Jump.
| OnlyOneOf Group Name | OnlyOneOf (온리원오브) |
| OnlyOneOf Members | – KB (규빈): Leader, Lead Rapper, Vocalist, Visual – Rie (리에): Lead Vocalist, Lead Dancer – YooJung (유정): Main Dancer, Vocalist, Visual – JunJi (준지): Main Vocalist, Lead Dancer – Mill (밀): Main Rapper, Vocalist – Nine (나인): Lead Vocalist, Maknae |
| OnlyOneOf Company / Label | 8D Entertainment |
| OnlyOneOf Debut Date | May 28, 2019 |
| OnlyOneOf Debut Song/Album | 1st Mini Album Dot Point Jump |
| OnlyOneOf Fandom Name | lyOn |
| OnlyOneOf Official Lightstick | – |
| OnlyOneOf Official Instagram | @onlyoneofofficial |
| OnlyOneOf Official TikTok | @onlyoneofofficial |
| OnlyOneOf Official Facebook | official.OnlyOneOf |
| OnlyOneOf Official Twitter | @OnlyOneOf_twt; @onlyoneofmember |
| OnlyOneOf Official YouTube | @OnlyOneOfofficial |
| OnlyOneOf Official Spotify | OnlyOneOf |
| OnlyOneOf Official Apple Music | OnlyOneOf |
| OnlyOneOf Official Website | http://onlyoneof-official.com/ |
1. OnlyOneOf Members Age
*Table is sorted by age
| OnlyOneOf Members Photo | OnlyOneOf Members Name | OnlyOneOf Members Age (2023) | OnlyOneOf Members Birthday |
 | KB (규빈) | 30 Years Old | April 23, 1992 |
 | Rie (리에) | 26 Years Old | November 6, 1996 |
 | YooJung (유정) | 25 Years Old | May 29, 1997 |
 | JunJi (준지) | 24 Years Old | April 6, 1998 |
 | Mill (밀) | 23 Years Old | March 30, 1999 |
 | Nine (나인) | 23 Years Old | December 13, 1999 |
OnlyOneOf members age in 2023: KB will be 31 years old on April 23. Rie will be 27 years old on November 6. YooJung will be 26 years old on May 29. JunJi will be 25 years old on April 6. Mill and Nine will both be 24 years old on March 30, and December 13, respectively.
Who is the oldest member of OnlyOneOf? The oldest member of OnlyOneOf is KB, who will be 31 years old on April 23, 2023. Who is the maknae of the youngest member of OnlyOneOf? The maknae or the youngest member of OnlyOneOf is Nine, who will be 23 years old on December 13, 2023.
2. OnlyOneOf Members Birthday Calendar
*Table is sorted by month
| OnlyOneOf Members Birthday | OnlyOneOf Members Photo | OnlyOneOf Members Name |
| March 30, 1999 |  | Mill Lee Yongsoo (이용수) |
| April 6, 1998 |  | JunJi Kim Junhyung (김준형) |
| April 23, 1992 |  | KB Shin Kyubin (신규빈) |
| May 29, 1997 |  | YooJung Lee Taeyeob (이태엽) |
| November 6, 1996 |  | Rie Lee Sungho (이성호) |
| December 13, 1999 |  | Nine Jung Wookjin (정욱진) |
3. OnlyOneOf Members Stage Name, Birth Name, & Birthplace
| Stage Name | Photo | Birth Name | Birth Place |
| KB (규빈) |  | Shin Kyubin (신규빈) | Masanhappo-gu, Changwon, Gyeongsangnam-do, South Korea |
| Rie (리에) |  | Lee Sungho (이성호) | Daedeok-gu, Daejeon, South Korea |
| YooJung (유정) |  | Lee Taeyeob (이태엽) | Gwangju, South Korea |
| JunJi (준지) |  | Kim Junhyung (김준형) | Incheon, South Korea |
| Mill (밀) |  | Lee Yongsoo (이용수) | Gwangju, South Korea |
| Nine (나인) |  | Jung Wookjin (정욱진) | Gimhae, Gyeongsangnam-do, South Korea |
4. OnlyOneOf Members Zodiac Sign, MBTI, & Blood Type
| Photo | Name | Birthday | Zodiac | MBTI | Blood Type |
 | KB (규빈) | April 23, 1992 | Taurus | ENTP | B |
 | Rie (리에) | November 6, 1996 | Scorpio | ISFP | A |
 | YooJung (유정) | May 29, 1997 | Gemini | ISFP | A |
 | JunJi (준지) | April 6, 1998 | Aries | ENFJ | B |
 | Mill (밀) | March 30, 1999 | Aries | ESFJ | B |
 | Nine (나인) | December 13, 1999 | Sagittarius | ISFJ | O |
5. OnlyOneOf Members Height
*Table is sorted by height
| OnlyOneOf Members Height | OnlyOneOf Members Name | OnlyOneOf Members Photo | OnlyOneOf Members Birthday |
| 181 cm (5 ft 11 in) | JunJi (준지) |  | April 6, 1998 |
| 180 cm (5 ft 11 in) | KB (규빈) |  | April 23, 1992 |
| 177 cm (5 ft 10 in) | Nine (나인) |  | December 13, 1999 |
| 176 cm (5 ft 9 in) | YooJung (유정) |  | May 29, 1997 |
| 173 cm (5 ft 8 in) | Rie (리에) |  | November 6, 1996 |
| 170 cm (5 ft 7 in) | Mill (밀) |  | March 30, 1999 |
6. OnlyOneOf Members Photo
A. KB
B. Rie
C. YooJung
D. JunJi
E. Mill
F. Nine
