Number of Members:

Hangul: 온리원오브

Alternative name:

Fandom Name: lyOn

Fandom Color:

Company/Agency: OnlyOneOf

Origin: South Korea

Debut Date: May 28, 2019

About OnlyOneOf

OnlyOneOf (온리원오브) is a K-Pop Boy Groups based in South Korea. They debuted on May 28, 2019. The group is currently Active.

OnlyOneOf Members

OnlyOneOf Member Ages

Ranked from oldest to youngest.

1. KBApr 23, 199230 years old
2. RieNov 06, 199626 years old
3. YoojungMay 29, 199725 years old
4. JunjiApr 06, 199825 years old
5. MillMar 30, 199924 years old
6. NineDec 13, 199923 years old

OnlyOneOf Member Heights

Ranked from tallest to shortest.

1. Junji1.81 m (5’11”)
2. KB1.80 m (5’11”)
3. Nine1.77 m (5’10”)
4. Yoojung1.76 m (5’9″)
5. Rie1.74 m (5’9″)
6. Mill1.71 m (5’7″)

Members and Position(s)


OnlyOneOf is composed of six members born between 1992 and 1999. Their names are: KB, Rie, Yoojung, Junji, Mill, and Nine. The oldest member is KB (born Apr 23, 1992). The youngest member (maknae) is Nine (born Dec 13, 1999). The official fandom name of OnlyOneOf is lyOn, a play on words that references both the name of the group and the English word lion. Former member Park Jisung (aka Love) left the group in August 2021.


KBlead rapper, vocalist, visual
Rielead vocalist, lead dancer
Yoojungmain dancer, vocalist
Junjilead vocalist, lead dancer
Millmain rapper, vocalist
Ninevocalist, maknae

Fun Facts and Trivia

  • The oldest member of OnlyOneOf is KB (born Apr 23, 1992).
  • The youngest member (maknae) of OnlyOneOf is Nine (born Dec 13, 1999).
  • The leader of OnlyOneOf was Love (born Jan 17, 1994). In August 2021, it was announced that he had left the group.


  • First group to debut under 8D CREATIVE and its subsidiary RSVP.
  • 8D CREATIVE had previously announced that a girl group would debut, so the announcement that a boy group would debut first took netizens by surprise.
  • The whole training process of the members was under the agency BlockBerry Creative, under the direction of Jaden Jeong they were transferred to 8D CREATIVE in order to debut.
  • Their first mini album can be found in digital format divided in two EP’s, “dot point jump Vol.1” and “Vol.2” respectively, the first one includes “time leap”, “savanna” and “blOssOm”, while the second one “OnlyOneOf yOu”, “picassO” and “fragile”.



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