ALLDAY PROJECTVocalistMaknae
Youngseo
영서Lee Young-seo (이영서)
Youngseo is ALLDAY PROJECT's vocalist and youngest member, a former R U Next? finalist who joined The Black Label after leaving ILLIT's pre-debut lineup.
- Age
- 20
- Nov 13, 2005
- Height
- 166 cm
- 5′5″
- MBTI
- ESTJ
- self-reported
- Debut
- 2025
- with ALLDAY PROJECT
At a glance
Profile
- Stage name
- Youngseo (영서)
- Birth name
- Lee Young-seo (이영서)
- Position
- Vocalist, Maknae
- Birthday
- November 13, 2005 (age 20)
- Zodiac sign
- Scorpio
- Chinese zodiac
- Rooster
- Height
- 166 cm (5′5″)
- Blood type
- A
- MBTI
- ESTJ
- Nationality
- South Korean
- Birthplace
- Seoul, South Korea
- Representative colour
- Purple
- Representative emoji
- 🐱
- Nicknames
- Zero
8 facts
About Youngseo
Youngseo first gained a following through the 2023 survival series R U Next?, where she finished second. She was selected for ILLIT's original lineup but left before that group's debut. She returned as an ALLDAY PROJECT member in June 2025 and contributes both vocals and lyrics to the group's music.
- 01
She is ALLDAY PROJECT's youngest member.
- 02
The R U Next? finale that selected her for ILLIT took place on September 1, 2023.
- 03
Belift Lab announced the mutual termination of her contract on January 5, 2024.
- 04
She had trained for several years before her appearance on the survival programme.
- 05
Her songwriting credits include YOU AND I, a vocal-focused song from the group's first EP.
- 06
She has named Billie Eilish as a musical role model.
- 07
She enjoys making rings with beads.
- 08
Kpopping and IdolInsights list her height as 166 cm, while Kprofiles and KpopSingers leave it unpublished; 166 cm is a secondary-source report rather than an agency-confirmed measurement.
4 other members
