Lee Young-seo, known mononymously as Youngseo, is a South Korean singer. She is a member of the South Korean co-ed group AllDay Project under The Black Label. Youngseo first gained public recognition as a contestant on the 2023 survival show R U Next?, where she placed second and was selected for the original lineup of the girl group Illit. Following her departure from Belift Lab in early 2024 before the debut of Illit, she has established a significant individual presence th…
