UDTT Members Profile and Facts
UDTT (우당탕탕 소녀단) is a 4-member South Korean pre-debut girl group under SW Entertainment. The group consists of Risako, Han Chaehee, Koo Hanna, and Kwon Yejin. Jung Sena left the group on March 26, 2025. They released their first pre-debut single titled “𝐑𝐄𝐓𝐑𝐘” on December 11, 2024. They are set to debut on April 29, 2025, with their first single album, School Rush.
Group Name Meaning: UDTT Is short for Uddang Tangtang Girls.
Official Greeting: “(two, three) Oops! Hello, We are UDTT!”
UDTT Official Fandom Name: N/A
Fandom Name Meaning: N/A
UDTT Official Color: N/A
UDTT Official Logo:
Official SNS:
Instagram: @udtt._.official
X: @udtt_official
Facebook: @udtt.official
TikTok: @udtt_official
YouTube: @udtt_official
Website: UDTT
UDTT Member Profiles:
Risako
Stage Name: Risako (리사코)
Birth Name: Arai Risako (新井 理沙子)
Position(s): Leader, Vocalist, Dancer
Birthday: June 7, 1997
>Zodiac Sign: Gemini
Chinese Zodiac Sign: Ox
Height: 161 cm (5’3″)
Weight: N/A
Blood Type: N/A
MBTI Type: ENFJ
Nationality: Japanese
Representative Color: Blue
Representative Emoji: 
Instagram: @arai_risako_67
YouTube: @arairisako3066
Risako Facts:
– She was revealed as the first member on November 24, 2024.
– Her hobbies are drawing and going to the Mangwon Market.
– Her specialties are dancing, speaking Korean, and vocal mimicry.
– She is the smallest member.
– She was a contestant on Girls Planet 999, where she was eliminated in episode 8.
– She used to be under iMe KOREA (2022–2023) and Biscuit Entertainment (2021).
– Her motto is “Never get tired of her attractive dancing, Arai Risako!”.
– She can speak Japanese and Korean.
– She can play the piano.
– She worked as a backup dancer for major Japanese artists since her childhood.
– Her nickname is RIRI.
– Her favorite number is six.
– Her favorite colors are light pink, purple, and skye blue.
– Her favorite season is spring.
– Her favorite songs are “Lion Heart” by Girls’ Generation, “Biidama” by AI OTSUKA, and “其实都没有 (Actually, no)” by 于冬然.
Han Chaehee
Stage Name: Han Chaehee (한채희)
Birth Name: Han Chae Hee (한채희)
Position(s): Sub Vocalist
Birthday: November 13, 2001
Zodiac Sign: Scorpio
Chinese Zodiac Sign: Snake
Height: 168 cm (5’6″)
Weight: 47 kg (103 lbs)
Blood Type: A
MBTI Type: INFP
Nationality: Korean
Representative Color: Purple
Representative Emoji: 
Han Chaehee Facts:
– She was revealed as the fifth member on November 28, 2024.
– She is a former member of the pre-debut group G.I.G.
– She used to be under CUP Entertainment (2021-2022).
– She won the 2016 Youth Dance Competition and has received awards at cultural arts festivals.
– Her nickname is Angel Cat.
– Her favorite number is seven.
– Although her position is vocalist, she considers herself a good dancer as well.
– Her favorite colors are pink and purple.
– Her favorite season is spring.
– A word that expresses her is “I’m stronger than you think.”
– Her charm point are her eyes and being lovely.
– Some song she recommends are “I Don’t Think That I Like Her” by Charlie Puth, “Wolves” by Selena Gomez, and “Psycho” by Red Velvet.
– She has never ridden a roller coaster, and it’s something she would like to do with the members.
Koo Hanna
Stage Name: Koo Hanna (구한나)
Birth Name: Koo Hyun Kyoung (구현경)
Position(s): Main Vocalist, Dancer
Birthday: January 20, 2004
Zodiac Sign: Aquarius
Chinese Zodiac Sign: Goat
Height: N/A
Weight: N/A
Blood Type: A
MBTI Type: ESTJ & ISTJ
Nationality: Korean
Representative Color: Pink
Representative Emoji: 
Instagram: @gusrudl
Koo Hanna Facts:
– She was revealed as the second member on November 25, 2024.
– She attended STAGE631 academy and Flat9 Academy.
– Her motto is “My youth is blood, sweat and tears”.
– She used to be under iMe KOREA (N/A), PocketDol Studio (2021), BEATS Entertainment (2022-2023), and Biscuit Entertainment (2021).
– She was a contestant on the survival show My Teenage Girl, where she was eliminated on Episode 3.
– The hashtags she uses to describe herself include: #refreshing, #smilingangel and #giantbaby.
– She worked as a backup dancer for the 2019 H.O.T. concert.
– She participated in the choreography video for T-ara Jiyeon’s “Take a Hike”.
– Her nicknames are, Tokkeng-i and Chaotic.
– Her favorite number is nine.
– Her favorite colors are pink and ivory.
– Her favorite season is spring.
– Her charm point is cute, but sexy.
– Her favorite body parts are her nose, plump lips, and sparkly eyes.
– A song she recommends is “Deja Vu” by Olivia Rodrigo.
Kwon Yejin
Stage Name: Kwon Yejin (권예진)
Birth Name: Kwon Ye Jin (권예진)
Position(s): Sub Vocalist, Maknae
Birthday: June 26, 2006
Zodiac Sign: Cancer
Chinese Zodiac Sign: Dog
Height: N/A
Weight: N/A
Blood Type: N/A
MBTI Type: ENTP
Nationality: Korean
Representative Color: Green
Representative Emoji: 
Kwon Yejin Facts:
– She was revealed as the third member on November 26, 2024.
– Her nickname is Geuroppi.
– Education: Lila Art High School.
– She dislikes bugs.
– Her charming point is the dimples on both her cheeks.
– She was a contestant on the survival show Universe Ticket, where she was eliminated on Episode 4 ranking #72.
– She is the best at drawing among the members.
– Her nickname is “Frog with big eyes”.
– Her favorite number is three.
– Her favorite color is mint.
– Her favorite season is summer.
– A word that expresses her is “chihuahua.”
– Her charm point is the moles under her eyes.
– Some songs she recommends are “This is what winter feels like” by JVKE, “Sea” by BTS and “Roar” by Katy perry.
– The members say that she is half F and half T when it comes to her personality.
Pre-debut Member(s):
Jung Sena
Stage Name: Jung Sena (정세나)
Birth Name: Jung Seung Ha (정승하)
Position(s): Main Rapper, Sub Vocalist, Maknae
Birthday: October 22, 2006
Zodiac Sign: Libra
Chinese Zodiac Sign: Dog
Height: N/A
Weight: N/A
Blood Type: N/A
MBTI Type: INFJ
Nationality: Korean
Representative Color: Yellow
Representative Emoji: 
Jung Sena Facts:
– She was revealed as the fourth member on November 27, 2024.
– She graduated from a dance department, winning the 2021 “Dance and Opera” award and the SAC Competition special prize.
– Education: Hanlim Arts School.
– The other members don’t think Sena is J because she doesn’t usually make plans.
– Her nickname is MC Sena.
– Her favorite number is seven.
– Her favorite colors are pink and pale yellow.
– She usually gives nicknames to the other members.
– She doesn’t like the color orange. She didn’t like the color yellow either, but after taking a personal color test, she discovered that it’s the color that suits her best.
– Her favorite season is fall.
– Some words that express her are “Baby Cat,” “Maknae,” “Cat,” and “Baby.”
– Her charm point is her thick lips.
– Her favorite songs are “Sorry Not Sorry” by Demi Lovato, “I’ll Be There”, and “This Love” by Maroon 5.
– Once, she dreamed that she lived for 30 years as a cat.
– Her favorite animals are cats.
– Jung Sena officially left the group on March 26, 2025 due to personal reasons.
Note #1: Please don’t copy-paste the content of this page to other sites/places on the web. Please do respect the time and effort the author put in compiling this profile. If you need/want to use info from our profile, please kindly put a link to this post. Thanks a lot! 
– Kprofiles.com
Note #2: Koo Hanna was confirmed as the Main Vocalist, and Risako as the Leader, in an article shared by the group’s official X (Twitter) account (Link). The group’s X (Twitter) account shared a second article confirming that Kwon Yejin, Jung Sena, and Han Chaehee are Sub Vocalists (Link). Jung Sena‘s Main Rapper, Koo Hanna‘s Dancer, and Risako‘s Vocalist and Dancer positions were confirmed in the members’ self-written profiles (Link).
For reference on MBTI types:
E = Extroverted, I = Introverted
N = Intuitive, S = Observant
T = Thinking, F = Feeling
P = Perceiving, J = Judging
(Source for their MBTI Types: The members’ self-written profiles which were uploaded on the group’s YouTube channel.)
Made by: “felipe grin§”
(Special thanks to: robhoney, Kpop Wiki)
Latest Pre-debut Release:
Who is your UDTT bias? Do you know more facts about them? Feel free to comment below.
