Lee Young-seo (이영서; born November 13, 2005) is a South Korean trainee. She is best known for being a former pre-debut member of the girl group ILLIT. She is now in the co-ed group AllDay Project
as Self
Oct 3, 2025
Jun 13, 2025
as Self - Contestant
Jun 30, 2023
Mar 23, 2023
Feb 5, 2023
as Self - Guest
Dec 5, 2015
