Jun 1, 2023-Jan 4, 2024
Youngseo (영서) is a South Korean idol trainee under Belift Lab. In 2023, she participated in the survival show R U Next?, where she ranked second and was chosen to debut in the group ILLIT.
On January 4, 2024, Youngseo left ILLIT after coming to a mutual agreement to terminate her contract with Belift Lab.