K-pop Girl Groups

ON1 ROOKIES Members Profile: Full Names, Ages, Heights, Weights and More

June 27, 2026 | By
ON1 ROOKIES members are Youyi, Yooran, Seojung, Jooa, Yejin, Jooha, Liya, and Seoyoon.
OriginSeoul, South Korea
DebutJanuary 12, 2024
DisbandedN/A
Sub UnitTeam A, Team B
Number of Members8
MembersYouyi
Yooran
Seojung
Jooa
Yejin
Jooha
Liya
Seoyoon
Oldest MemberYouyi
Youngest Member (Maknae)Seoyoon

ON1 ROOKIES Former Members Profile

Youyi

ON1 ROOKIES member Youyi
Full NameN/A
BirthdayMay 01, 2010
BirthplaceN/A
Age16 years and 1 month old
Height4 feet 11 inches (150 cm)
Weight90 lbs (41 kg)
Zodiac SignTaurus
MBTIENFP/ESFP
PositionLeader of Team A
Instagramiiistariii12

Yooran

ON1 ROOKIES member Yooran
Full NameShin Yooran
BirthdayMay 10, 2010
BirthplaceN/A
Age16 years and 1 month old
Height5 feet 3 inches (159 cm)
Weight86 lbs (39 kg)
Zodiac SignTaurus
PositionLeader of Team B
Instagram@shin__yooran

Seojung

ON1 ROOKIES member Seojung
Full NamePark Seojung
BirthdayAugust 05, 2010
BirthplaceN/A
Age15 years and 10 months old
HeightN/A
Zodiac SignLeo
MBTIENFP

Jooa

ON1 ROOKIES member Jooa
Full NamePark Jooa
BirthdaySeptember 18, 2010
BirthplaceN/A
Age15 years and 9 months old
Height5 feet 4 inches (163 cm)
Weight101 lbs (46 kg)
Zodiac SignVirgo
MBTIESFP
Instagram@joochaeyul_danbi

Yejin

ON1 ROOKIES member Yejin
Full NameKim Yejin
BirthdayDecember 16, 2010
BirthplaceN/A
Age15 years and 6 months old
HeightN/A
Zodiac SignSagitarius
MBTIENFP

Jooha

ON1 ROOKIES member Jooha
Full NameSong Jooha
BirthdayApril 06, 2011
BirthplaceN/A
Age15 years and 2 months old
HeightN/A
Zodiac SignAries
MBTIESTP

Liya

ON1 ROOKIES member Liya
Full NamePark Victoria
BirthdayAugust 19, 2011
BirthplaceN/A
Age14 years and 10 months old
HeightN/A
Zodiac SignLeo
MBTIENFP
Instagramliya._.pak

Seoyoon

ON1 ROOKIES member Seoyoon
Full NameJeon Seoyoon
BirthdayJune 22, 2012
BirthplaceN/A
Age14 years old
Height5 feet 0 inches (153 cm)
Weight83 lbs (38 kg)
Zodiac SignCancer
MBTIENTP
PositionMaknae
Instagram@seo_yoon0622

Member Ages: Oldest to Youngest

MemberBirthdayAge
YouyiMay 01, 201016 years, 1 month, 26 days old
YooranMay 10, 201016 years, 1 month, 17 days old
SeojungAugust 05, 201015 years, 10 months, 22 days old
JooaSeptember 18, 201015 years, 9 months, 9 days old
YejinDecember 16, 201015 years, 6 months, 11 days old
JoohaApril 06, 201115 years, 2 months, 21 days old
LiyaAugust 19, 201114 years, 10 months, 8 days old
SeoyoonJune 22, 201214 years, 5 days old

FAQs

How many members are in ON1 ROOKIES?

ON1 ROOKIES is a 8-member K-pop girl group. The group consists of Youyi, Yooran, Seojung, Jooa, Yejin, Jooha, Liya, and Seoyoon.

When did ON1 ROOKIES debut?

ON1 ROOKIES debuted on January 12, 2024, with their song ROONIVERSE.

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