UDTT

UDTT (우당탕탕 소녀단) is a five-member girl group formed by SW Entertainment, officially debuting on April 29, 2025 with the single album School Rush. In November 2024, the group launched their official social media accounts and introduced members one by one: Risako, Koo Hanna, Kwon Yejin, Jung Sena, and Han Chaehee. Ahead of their debut in 2024, they released the pre-debut track "Retry" and launched a webtoon series titled Uddang Tangtang Girls, written by Jehu, chronicling their journey to debut. Jung Sena later left the group in March 2025 for personal reasons. Following her departure, a virtual member was temporarily added, and auditions for a new member began. On April 28, it was confirmed that Chinese soloist Lu Yuting, known from Chuang Asia Thailand and Time Turner, would join under the stage name Jessica. UDTT debuted as a five-member group, including Jessica, with a performance on The Show.

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