tripleSVocalistMaknae

SeoAh

서아Jeong Hae-rin (정해린)

S23 SeoAh is tripleS's youngest member, a vocalist and taekwondo practitioner who debuted in Glow and later joined Neptune.

ColourLight CyanEmoji

Photo: K-POPIT, via Wikimedia Commons · CC BY 3.0

Age: 16; Jun 11, 2010
Height: 156 cm; 5′1″
MBTI: ESTP; self-reported
Debut: 2024; with tripleS

At a glance

Profile

Stage name: SeoAh (서아)
Birth name: Jeong Hae-rin (정해린)
Position: Vocalist, Maknae
Birthday: June 11, 2010 (age 16)
Zodiac sign: Gemini
Chinese zodiac: Tiger
Height: 156 cm (5′1″)
Blood type: O
MBTI: ESTP
Nationality: South Korean
Birthplace: Ochi-dong, Buk-gu, Gwangju, South Korea
Representative colour: Light Cyan
Representative emoji: ☀️
Nicknames: Sunny, Baby Seo
Joined: April 3, 2024

8 facts

About SeoAh

Jeong HaeRin adopted the stage name SeoAh when she was revealed as S23. The youngest tripleS member debuted with Assemble24 and then joined Glow and Neptune.

01
She was revealed as S23 on April 3, 2024.
02
She was born Jeong Hae-rin and promotes under the stage name SeoAh.
03
She is the youngest member of tripleS's completed 24-member lineup.
04
She practices taekwondo.
05
She graduated from Gwangnam Middle School in January 2026.
06
She entered Hanlim Multi Art School's applied-music department in March 2026.
07
She was elected vice president of her first-year class.
08
She debuted in Glow and later performed Fly Up as a Neptune member.

2 tracks

Solo & unit tracks

Songs on tripleS releases that feature SeoAh on her own or in a unit.

Nov 24, 2025
“Fly Up”
Neptune: SeoYeon, NaKyoung, DaHyun, Kotone, Nien & SeoAh · Beyond Beauty
EP
Jun 21, 2024
“Inner Dance”
Unit: ChaeWon, Sullin, SeoAh & JiYeon · Inner Dance
Digital single

Photo credits

SeoAh of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
SeoYeon of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
HyeRin of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
JiWoo of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
ChaeYeon of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
YooYeon of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
SooMin of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
NaKyoung of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
YuBin of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
Kaede of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
DaHyun of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
Kotone of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
YeonJi of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
Nien of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
SoHyun of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
Xinyu of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
Mayu of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
Lynn of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
JooBin of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
HaYeon of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
ShiOn of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
ChaeWon of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
Sullin of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source
JiYeon of tripleS at the Assemble24 showcase: K-POPIT, via Wikimedia Commons · CC BY 3.0 · source

Profile

About SeoAh

Solo & unit tracks

Also in tripleS