영서

Lee Young-seo, known mononymously as Youngseo, is a South Korean singer under The Black Label. She is the maknae of the co-ed group ALLDAY PROJECT.

She 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. After leaving Belift Lab in early 2024, before ILLIT's debut, she has built a strong individual presence through high-profile fashion editorials and solo brand collaborations.