WJSN

Yeonjung

연정 · Yoo Yeon-jung (유연정)

Yoo Yeon-jung

WJSN Main Vocalist Maknae Face of the Group

🎂 March 8, 1999 🌍 Korean 📏 167 cm ⚖️ 52 kg 🩸 Type A 🧠 ESTP

Yeonjung is a South Korean singer and musical theatre actress best known as the main vocalist and maknae of the K-pop girl group WJSN (Cosmic Girls) under Starship Entertainment. Born Yoo Yeon-jung on August 3, 1999, in Gwangmyeong, Gyeonggi Province, she first rose to fame competing on Mnet's Produce 101 in 2016, finishing 11th and debuting with project group I.O.I before joining WJSN as its 13th member that same year. In WJSN's zodiac concept, she represents Ophiuchus, though her real sign is Leo. Known for her powerful vocal range, Yeonjung has recorded numerous Korean drama OSTs, won Mnet's vocal survival show V-1 in 2019 as "Vocal Queen," and built a growing musical theatre career with lead roles in productions like Lizzie and Crash Landing on You. With her bright energy, clear "cider vocal" tone, and steady presence as WJSN's main vocalist since 2016, Yeonjung remains one of the group's most dynamic and widely recognized members, balancing group promotions, solo OST work, and stage acting nearly a decade into her career.

Story

Biography

Yeonjung is a South Korean singer and musical theatre actress, best known as the main vocalist and maknae of WJSN (Cosmic Girls) under Starship Entertainment, and as a former member of the project girl group I.O.I. With powerful high notes, a bright stage presence, and an ever-growing musical theatre resume, Yeonjung is one of the most recognizable names for fans searching WJSN main vocalist, I.O.I members, or K-pop musical actresses.

Who Is Yeonjung?

Born Yoo Yeon-jung on August 3, 1999, in Gwangmyeong, Gyeonggi Province, South Korea, Yeonjung originally trained under SM Entertainment before moving to Starship Entertainment. In 2016, she represented Starship on Mnet’s massive survival show Produce 101, finishing 11th and earning a spot in the eleven-member project group I.O.I, which debuted in May 2016 with the EP Chrysalis.

Joining WJSN

While still promoting with I.O.I, Yeonjung was introduced as the 13th and final member of WJSN on July 11, 2016, officially debuting with the group on August 17, 2016 via the EP The Secret. In WJSN’s astrology-themed concept, she represents the constellation Ophiuchus, even though her real zodiac sign is Leo. Despite Dayoung being older in trainee terms, Yeonjung is WJSN’s actual maknae (youngest member).

OSTs, Vocal Competitions, and Musical Theatre

Yeonjung has one of the busiest side discographies in WJSN, lending her voice to numerous Korean drama OSTs over the years. In 2019, she won Mnet’s vocal survival show V-1, earning the title “Vocal Queen” after defeating Dreamcatcher’s Siyeon in the finals. She’s since built an impressive musical theatre career, making her stage debut as Alice Russell in Lizzie (2022), later starring as Seo Dan in a stage adaptation of Crash Landing on You, and joining the cast of The Great Comet of 1812.

Personality and Fun Facts

Nicknamed the “Cider Vocal” for her clear, refreshing tone, Yeonjung can also play guitar and is known to be close friends with Red Velvet’s Yeri. Whether you know her from I.O.I, as WJSN’s main vocalist, or from the Korean musical theatre stage, Yeonjung continues to prove herself as one of the most versatile vocalists in K-pop.

Profile

Basic Information

Stage Name	Yeonjung
Full Birth Name	Yoo Yeon-jung (유연정)
Date of Birth	August 3, 1999
Birthplace	Gwangmyeong, Gyeonggi Province, South Korea
Hometown	Gwangmyeong, Gyeonggi Province, South Korea
Nationality	South Korean
Height	167 cm (5'6")
Weight	52 kg (115 lbs)
Blood Type	A
Zodiac Sign	Leo (represents Ophiuchus in WJSN)
MBTI	ESTP
Education	Hanlim Multi Art School; Dankook University (Musical Theatre, admitted 2017)
Agency	Starship Entertainment
Debut	August 17, 2016 (WJSN, ""The Secret"")
Languages	Korean
Nicknames	Cider Vocal
Hobbies	Playing guitar, singing, musical theatre
Favorite Color	Not officially confirmed
Ideal Type	Not officially confirmed

Membership

Groups & Positions

WJSN

Starship Entertainment

Main Vocalist Maknae Face of the Group

August 2016 – Present

I.O.I

YMC Entertainment (project group)

2016 (project group)

The Lineup

Group Members — WJSN

Seola

Leader · Lead Vocalist · Lead Dancer

Bona

Lead Dancer · Lead Rapper · Sub Vocalist · Visual

Exy

Main Rapper · Vocalist

Soobin

Vocalist · Visual

Luda

Main Dancer · Sub Vocalist

Dawon

Main Vocalist

Eunseo

Lead Rapper · Lead Dancer · Sub Vocalist

Yeoreum

Main Dancer · Sub Rapper · Sub Vocalist

Dayoung

Lead Vocalist

Yeonjung

Main Vocalist · Maknae · Face of the Group

This Idol

Journey

Career Timeline

2016

Produce 101 & I.O.I debut

Represented Starship Entertainment on Mnet's ""Produce 101,"" finishing 11th and debuting with the project girl group I.O.I via the EP ""Chrysalis"" on May 4, 2016.

2016

Joined WJSN

Introduced as WJSN's 13th and final member on July 11, 2016 while still promoting with I.O.I; officially debuted with WJSN on August 17, 2016 via the EP ""The Secret.""

2017

University admission

Accepted through rolling admission into Dankook University's musical theatre program in November 2017.

2019

Won V-1 ""Vocal Queen""

Won Mnet's vocal survival competition ""V-1,"" earning the title ""Vocal Queen"" after defeating Dreamcatcher's Siyeon in the finals.

2020

OST activities

Recorded the OST track ""Spider Lily"" for the drama ""More Than Friends,"" continuing a long run of Korean drama soundtrack features.

2022

Musical theatre debut

Made her musical theatre debut as Alice Russell in the musical ""Lizzie"" on March 24, 2022.

2022

WJSN wins Queendom 2

WJSN was crowned winner of Mnet's competition show Queendom 2 at its live finale on June 2, 2022.

2024

Musical ""The Great Comet""

Cast in the Korean production of the musical ""The Great Comet of 1812.""

Music

Discography

🎵

I Will Be On Your Side (with Yoo Seung-woo)

Collab Single

2016

🎵

You're Dazzling (Queen for Seven Days OST)

OST

2017

🎵

Marry You (with Maktub)

OST/Collab Single

2017

🎵

Spider Lily (More Than Friends OST)

OST

2020

💜

Would You Like?

2016

💜

The Secret

2016

💜

From. WJSN

2017

💜

Happy Moment

Studio Album

2017

💜

Dream Your Dream

2018

💜

WJ Please?

2018

💜

WJ Stay?

2019

💜

For the Summer

Special Album

2019

💜

As You Wish

2019

💜

Neverland

2020

💜

Unnatural

2021

💜

Sequence

Single Album

2022

💜

Bloom Hour

Digital Single

2026

🎧

Chrysalis (I.O.I)

Mini Album

2016

🎧

Miss Me? (I.O.I)

Mini Album

2017

Recognition

Awards & Achievements

🏆

Trivia & Fun Facts ✨

★

Yeonjung was born in Gwangmyeong, Gyeonggi Province, South Korea.

★

She has a younger brother.

★

She originally trained under SM Entertainment before joining Starship Entertainment.

★

She competed on Mnet's "Produce 101" (season 1) in 2016, finishing 11th and earning a spot in the project group I.O.I.

★

While still promoting with I.O.I, she was introduced as the 13th member of WJSN in July 2016.

★

She graduated from Hanlim Multi Art School.

★

In 2017, she was accepted through rolling admission into Dankook University's musical theatre program.

★

In WJSN's zodiac-themed concept, she represents Ophiuchus even though her real sign is Leo.

★

Although Dayoung was originally introduced as the youngest, Yeonjung is WJSN's actual maknae.

★

Her nickname is "Cider Vocal" for her clear, refreshing singing tone.

★

She can play the guitar.

★

She's close friends with Red Velvet's Yeri.

★

She made a cameo appearance in the drama "A Korean Odyssey" (2017).

★

She has recorded numerous OSTs for Korean dramas, including tracks for "Where Stars Land," "The Undateables," and "Melting Me Softly."

★

She won Mnet's vocal survival show "V-1" in 2019, earning the title "Vocal Queen" after defeating Dreamcatcher's Siyeon in the finals.

★

She made her musical theatre debut in March 2022, playing Alice Russell in the musical "Lizzie."

★

Later in 2022, she starred as Seo Dan in the stage adaptation of "Crash Landing on You."

★

In 2023, she co-starred with fellow WJSN member Soobin in a musical set during the Japanese colonial era.

★

She was cast in the Korean production of the musical "The Great Comet of 1812."

★

She's known for her wide vocal range and powerful high notes.

★

Her early-profile hobby was listed simply as "playing alone," which fans found endearing.

★

She trained for about one year and three months before debuting.

★

She has said she wants to keep pursuing both music and musical theatre alongside WJSN activities.

The Fandom

Fan Club & Fan Name 💜

Official Fan Name

Ujung (우정)

Ujung is WJSN's official fandom name, revealed on January 11, 2017. In Korean, 우정 (u-jeong) means "friendship," but it is also styled as a playful abbreviation of 우주 정거장 ("space station") — a nod to the group's Korean name, Woojoo Sonyeo ("Cosmic/Space Girls"). It reflects the close, family-like bond between WJSN and their fans.

Official Fan Color

Vivid Tangerine|Airforce Blue|Timberwolf

A warm coral-orange representing WJSN's bright, energetic charm|A cool, starry blue-grey symbolizing the group's "cosmic" and space-themed concept|A soft, glittering grey-white that ties the palette together and evokes stardust

Official Light Stick

WJSN Official Light Stick (Ujung Bong)

Unveiled on December 28, 2017 and released January 31, 2018, the lightstick has a silver handle and a transparent globe engraved with "WJSN X UJUNG." Inside are two rotating rings in the group's Pantone fan colors plus a glittering heart, giving it a galaxy-like glow when lit — a nod to WJSN's cosmic, outer-space concept. It runs on 3 AAA batteries and lasts roughly 4 hours per charge.

Fan Community Platform

Fancafe

WJSN's official Daum Fancafe (WJSNcosmic) is the group's main hub for fan interaction, exclusive updates, fansign applications, and members' personal posts.