S2iT

S2iT (에스투잇) is a five-member South Korean girl group under TNH Entertainment and MONSTER BRAIN. The company Be The Max Entertainment solely manages their performances. The lineup consists of Yeonsoo, Haru, Sea, Hyobin, and Seungbi. They debuted on March 14, 2026, with the digital single “What I Want”

S2iT members height, age

Click on a member's name to scroll to their profile

Member	Height	Age
Haru	158 cm	21 years
Yeonsoo	163 cm	21 years
Sea	161 cm	20 years
Hyobin	167 cm	17 years
Seungbi	165 cm	16 years

Debut Date: March 14, 2026
Group Name Meaning: The "S" in S2iT stands for the word "shine." The number 2 in the group stands for "to". The group advances on a journey toward its goal (it) with a sound filled with its own light and passion. In short, the group shines while moving towards it.
Official Greeting: "Be Your Mirror, Be Your Light, Hello we are S2iT!"
MONSTER BRAIN Webpage: @에스투잇 (S2IT)

Official links

Group Stats

Average height: 162.8 cm
Tallest: 167 cm · Hyobin
Shortest: 158 cm · Haru
Average age: 19 years
Oldest: 21 years · Haru
Youngest: 16 years · Seungbi

Members

Haru

Stage Name: Haru (하루)
Birth Name: Lee Yunseon (이윤선)
Position(s): Leader, Main Dancer
Birthday: July 14, 2005
Age: 21 years
Zodiac Sign: Cancer
Chinese Zodiac Sign: Rooster
Height: 158 cm (5'2″)
Weight: 42 kg (92 lbs)
MBTI Type: ENFP
Nationality: Korean
Naver Blog: @julyseon_

Facts

She is from Gumi, Gyeongsangbuk-do, South Korea.
Her favorite perfume brands are Dior and Prada.
Haru danced at RED STAGE and mu:tudio.
She competed in dance contests as a child.
Her most-used apps are KakaoTalk, Instagram, and Camera.
She enjoys choreographing dances.
In 2023, she won Gumi City’s National Singing Contest (KBS).
She was a pre-debut member of Glacia.
Two of her special skills are choreographing and singing trot.
She attends Seoul Hoseo Art College (Practical Dance), and previously studied at Sangmo High School.
She began dancing at age seven.
Her ideal type is someone cute when laughing.
She is part of dance team WILDBODY, and was previously in HERIUN and Inherent, using the stage name YSEON.
Her role models are GFRIEND, fromis_9’s Song Hayoung (for her all-rounder quality and cute image), and BLACKPINK.
She dreamed of becoming an idol after seeing GFRIEND perform in 2016.
Her hobby is watching movies.
Her favorite colors include blue, black, white, and pink.
She can perform five Latin dance styles.
She prefers sweet desserts over rice.
Her dream of becoming an idol grew after her mother enrolled her in a dance academy, seeing her passion for teaching and performing.
Her audition song was Taeyeon’s “Fire.”

Yeonsoo

Stage Name: Yeonsoo (연수)
Birth Name: Baek Yeonsoo (백연수)
Position(s): Main Vocalist
Birthday: June 25, 2005
Age: 21 years
Zodiac Sign: Cancer
Chinese Zodiac Sign: Rooster
Height: 163 cm (5'4″)
Weight: 45 kg (99 lbs)
MBTI Type: INFJ
Nationality: Korean

Facts

Yeonsoo is from Cheonan-si, Chungcheongnam-do, South Korea.
She was a pre-debut member of Glacia.
Her hobbies include writing lyrics, watching ballet, and making bead crafts.
Her role models are Rihanna (for her aura and energy), BLACKPINK, and Rain.
She studied at Flowing Academy and Joy Dance Plugin Music Academy.
She speaks English and Korean.
The first K-pop dance she learned was Apink’s “NoNoNo.”
She likes Jo Malone perfumes, especially Michael Malul’s Citizen Jill.
Her special skills are choreography and lyric writing.
She passed auditions for MODHAUS, WAKEONE, P NATION, and Biscuit Entertainment.
She is close to influencer Lee Jaeyeon.
Her favorite colors include red, blue, Indian pink, and green.
Her favorite food is donuts.
Her parents said she danced at home since age 3, inspiring her to become an idol.
Her audition songs were JJ Lin’s “Bedroom (feat. Anne-Marie)” (vocals) and NewJeans’ “Hype Boy” (dance).
She studied ballet until 4th grade, enjoying fast beats.

Sea

Stage Name: Sea (세아)
Birth Name: Song Jiwoo (송지우)
Position(s): Lead Vocalist
Birthday: August 9, 2006
Age: 20 years
Zodiac Sign: Leo
Chinese Zodiac Sign: Dog
Height: 161 cm (5'3.5″)
Weight: 43 kg (94 lbs)
MBTI Type: ENFP
Nationality: Korean

Facts

Her special skill is dancing.
Sea trained at Choco Entertainment (Aug-Oct 2024).
She attended Osong High School and joined its dance team.
Her role model is aespa’s Karina.
Her hobby is walking.
She studied at Mudoctor Academy.
She describes her voice as purple, dreamy.
Her favorite color is pink.
She chose the stage name Sea to represent a clear, ocean-like image.
Her audition song was Taeyeon’s “Gravity.”
Her favorite foods are ice cream, tteokbokki, and malatang.

Hyobin

Stage Name: Hyobin (효빈)
Birth Name: Park Hyobin (박효빈)
Position(s): Sub Vocalist
Birthday: October 16, 2009
Age: 17 years
Zodiac Sign: Libra
Chinese Zodiac Sign: Ox
Height: 167 cm (5'5.5″)
Weight: 44 kg (97 lbs)
MBTI Type: INFJ
Nationality: Korean

Facts

Hyobin’s favorite color is pink.
She was part of 4D Label’s group Trendy.
Her hobby is watching movies.
She has a younger sister and brother.
She studied at Mudoctor Academy.
Her special skills include choreography, acting, and street dance.
She was inspired by TWICE, with Nayeon as her favorite.
She performed in Gyeonggi Teens Musical.
Her role model is Jang Wonyoung.
Her audition song was by Justin Bieber.
She attends SOPA (Theater & Film).
Her personal palette is cool summer, so she often wears pink.
Her favorite foods are sweets, especially chocolate.
She became interested in performing after registering at an academy.

Seungbi

Stage Name: Seungbi (승비)
Birth Name: Ahn Seungbi (안승비)
Position(s): Rapper, Maknae
Birthday: July 13, 2010
Age: 16 years
Zodiac Sign: Cancer
Chinese Zodiac Sign: Tiger
Height: 165 cm (5'5″)
Blood Type: B
MBTI Type: ENFJ/ENTJ
Nationality: Korean
NGL: @asb07131

Facts

She lives in Nonhyeon-dong, Incheon, South Korea.
Seungbi competed on Universe Ticket, placing 43rd.
She memorizes choreographies quickly.
Her favorite facial feature is her dimples.
She was in Play With Me Club (2021-2022; 2024-present), and pre-debut groups A4TEEN and Hi Dream.
Her favorite foods include seonji haejang-guk, tteokbokki, gopchang, mulhwe, seafood, and hoe.
She has an older brother and a younger brother named Seungyou.
She takes dance classes at RED STAGE.
Her favorite artist is BoA.
Her ideal type is warm-hearted, kind, and reliable.
She models for brands like BLAHBANG and PRANKERS.
Her nicknames include Dracula (for crooked teeth) and Dolphin (from an audition).
If she had a superpower, she’d choose teleportation.
Her audition song was BABYMONSTER’s “BATTER UP.”
She began training in sixth grade.
Her favorite colors are pastel shades.
Her role model is G-Dragon, for composing and stage presence.
Her favorite Sanrio characters are Hello Kitty and Cinnamoroll.
She learned composition in middle school.
She attends Hanlim Multi Art School (Entertainment Department).
She has loved performing since childhood.