UDTT (우당탕탕 소녀단) is a 5-member South Korean girl group under SW Entertainment. The group consists of Risako, Han Chaehee, Koo Hanna, Lu Yuting, 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 officially debuted on April 29, 2025, with their first single album, School Rush.
UDTT members height, age
Click on a member's name to scroll to their profile
She used to be under International Star Family (2019-2021), PI Corporation (2024-2025), GOLDDUST Entertainment (2023-2024), and Moai Entertainment (2025), although she never never actually signed a contract with the last one.
She is a former member of the children's girl group IS GIRL (2019-2021) and was also a pre-debut member of BEWAVE, I.MET.U (2024-2025) and E11iVYN (2025).
She officially debuted as a soloist on July 17, 2022, with her first digital single, '仲夏夜梦', under her real name.
She was a contestant on Chuang Asia Thailand (2024), where she made it to the finals and ranked 18th, and on Time Turner (2024), where she ranked 3rd, earning a spot in the final line-up I.MET.U. However, she left the group on January 17, 2025, before their debut.
She is a big fan of BLACKPINK.
Yuting's role model and favorite idol is BLACKPINK's Jisoo.
Yuting's favorite song is "Don't Know What to Do" by BLACKPINK.
Yuting's favorite color is pink.
She is a fan of Harry Potter, and the movies from the series are her favorites.
She is friends with tripleS' Xinyu, CSR's Duna, former Universe Ticket contestant Yona, and more idols.
Education: Berklee College of Music (Music Performance).
She has trained for approximately 6 to 7 years.
She was revealed as a new member on April 29, 2025.
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 in 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.
Former member
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
MBTI Type
INFJ
Nationality
Korean
Representative Color
Yellow
Representative Emoji
🐯
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.
Risako
Han Chaehee
Koo Hanna
Lu Yuting
Kwon Yejin
Jung Sena
