UDTT Official Thread

[BEG4DAWIN]

UDTT is a 5-member South Korean girl group under SW Entertainment. The group consists of Risako, Han Chaehee, Koo Hanna, Jessica, 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.​

Debut

4 Members

Back to 5

Official SNS:

Instagram: @udtt._.official
X: @udtt_official
Facebook: @udtt.official
TikTok: @udtt_official
YouTube: @udtt_official
Website: UDTT​

 

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Members

Risako​

Birth Name: Arai Risako
Position(s): Leader, Vocalist, Dancer
Birthday: June 7, 1997
Height: 161 cm (5’3″)
Nationality: Japanese
Instagram: @arai_risako_67
She was a contestant on Girls Planet 999


Han Chaehee​

Birth Name: Han Chae Hee
Position(s): Sub Vocalist
Birthday: November 13, 2001
Height: 168 cm (5’6″)
Nationality: Korean


Koo Hanna​

Birth Name: Koo Hyun Kyoung
Position(s): Main Vocalist, Dancer
Birthday: January 20, 2004
Height: N/A
Nationality: Korean
Instagram: @gusrudl
She was a contestant on the survival show My Teenage Girl


Jessica

Birth Name: Lu Yuting
Position(s): N/A
Birthday: February 17, 2005
Height: 174 cm (5’8″)
Nationality: Chinese
Instagram: @luyuting217
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 was a contestant on Chuang Asia Thailand (2024)


Kwon Yejin​

Birth Name: Kwon Ye Jin
Position(s): Sub Vocalist, Maknae
Birthday: June 26, 2006
Height: N/A
Nationality: Korean
She was a contestant on the survival show Universe Ticket


Former Members

Jung Sena​

Birth Name: Jung Seung Ha
Position(s): Main Rapper, Sub Vocalist, Maknae
Birthday: October 22, 2006
Height: N/A
Nationality: Korean​

 

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Debut

UDTT
[𝐑𝐄𝐓𝐑𝐘]
2024.12.11 6PM(KST)

 

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#RISAKO

#KOOHANNA

#KWONYEJIN

#JUNGSENA

#HANCHAEHEE

 

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'𝐑𝐄𝐓𝐑𝐘' PERFORMANCE VIDEO

 

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March 26th 2025; Sena leaves UDTT due to personal reasons

[media]https://x.com/udtt_global/status/1904823894105555307[/media]

 

[BEG4DAWIN]

UDTT
1st Single Album [𝐒𝐜𝐡𝐨𝐨𝐥 𝐑𝐮𝐬𝐡]
2025.04.29 12PM(KST)

 

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1st Single Album [𝐒𝐜𝐡𝐨𝐨𝐥 𝐑𝐮𝐬𝐡]

 

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UDTT (우당탕탕 소녀단) 'REALLY REALLY'

https://x.com/udtt_official/status/1917064701416231406

 

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UDTT adds a 5th member

UDTT's 5th member is Jessica (우정), also known as Lu Yuting who participated on survival shows Chuang Asia and TIME TURNER

To tie-in with the group's school concept, Jessica is joining as a 'Chinese exchange student'

https://x.com/nugupromoter/status/1917051214388465865

 

[꒰ა ᧔ 𝒴𝓊𝓂𝒾𝓂ℯ𝓀ℴ ᧓ ໒꒱]

HELP NOT THE BACK AND FORTH FIVE AND FOUR MEMBERS