UDTT (우당탕탕 소녀단) is a South Korean girl group under SW Entertainment. The group consists of five members: Risako, Han Chaehee, Koo Hanna, Jessica, and Kwon Yejin. The group released their pre-debut single "RETRY" on December 11, 2024, before making their official debut on April 29, 2024 with the album "School Rush". Pre-debut member Jung Sena left in March 2025, a month before the group's official debut, and Jessica joined the group on the day of their debut
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