Youngseo (ALLDAY PROJECT) Profile and Facts:
Youngseo (영서) is a South Korean singer and member of ALLDAY PROJECT under THEBLACKLABEL. She was a pre-debut member of the girl group I’LL-IT (before the re-brand to ILLIT) formed by the survival show R U Next?.
Stage Name Meaning: It’s her birth name.
Youngseo’s Official Signature:
Official SNS:
Instagram: @youngseo
Stage Name: Youngseo (영서)
Birth Name: Lee Young-seo (이영서)
Birthday: November 13th, 2005
Zodiac Sign: Scorpio
Chinese Zodiac Sign: Rooster
Height: 165.5 cm (5’5″)
Weight: N/A
Blood Type: A
MBTI Type: ESTJ
Nationality: Korean
Representative Color: Purple
Representative Emojis: 
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Youngseo Facts:
– Youngseo was born in Gangnam-gu, Seoul, South Korea.
– Her family consists of her and her parents.
– She is an only child.
– Education: Kyonggi Elementary School, Yonggang Middle School, Gaepo High School.
– Youngseo got casted in front of her elementary school.
– She is a former R U Next? contestant, she made it to the finals.
– In ALLDAY PROJECT, her positions are vocalist and the maknae (youngest).
– The agencies she was a trainee at: SM Ent. (2018-?), ADOR, Source Music (2018-2022), & BELIFT LAB (2022-2024).
– She’s close to the NewJeans members as they were in the same dorm for a year and under ADOR.
– Youngseo has been training for 4-5 years.
– She used to be a YouTuber.
– According to netizens, she looks like aespa‘s Karina.
– Her favorite color is pink.
– Youngseo’s favorite number is 1.
– Her favorite space is her bed.
– One day, she would like to visit New York City.
– She loves cats and cherries.
– Her favorite dessert is a fat macaron.
– She’s close to ME:I‘s Sakurai Miu and Idol School‘s Kim Eunkyul.
– Youngseo is also close to Jihyun and izna‘s Jeemin.
– She first got to know Jeemin during their days as Source Music trainees. They’re also both 05-liners.
– The two used to go to restaurants together before heading to work.
– She loves cherries and its shape.
– Her role model is Billie Eilish.
– Youngseo looks up to SZA vocally, but she is a fan of many female artists.
– She is a fan of 2NE1.
– She has a habit of touching her hair.
– Her favorite animal is a cat.
– She says she resembles a cat.
– Youngseo enjoys going to cat cafes and watch cat videos.
– She has a sharp & round face with cat-like eyes.
– She has a big appetite.
– Youngseo says she’s slow in everything but eating.
– A food that she hates is bell peppers. (50 Q&A)
– She also dislikes garlic, onions, paprika, pickles, and shrimp.
– Youngseo cannot drink coffee, she only drinks iced drinks.
– She did ballet.
– Her charm is that she looks chic, but acts funny.
– She likes sleeping a lot to the point where she wakes up at 3-4pm on her days off.
– Her nicknames are Nyangseo (냥서) (50 Q&A) and Zero.
– Her nickname “Zero” was given to her by fellow ALLDAY PROJECT member Woochan.
– Her favorite movie is Avatar 2.
– A word she say often; “Wow“. (50 Q&A)
– Shoe Size: 250mm (39 EU / 8.5 USA).
– Her pinky is 7.5 cm and her middle finger is 9.5 cm whilst her hand span is 20.5 cm. (50 Q&A)
– Two of her hobbies are eating and making beaded rings.
– If she could eat only one food for the rest of her life, she picks any type of noodle dish.
– Her favorite ice cream flavors are mint chocolate and yogurt.
– Youngseo’s favorite season is summer as she likes the vibe & when the sunlight shines on her.
– If she was born as an object, she picks a pillow so that she can make people comfortable.
– It’s very easy to become friends with Youngseo by talking to her first. (50 Q&A)
– If she had 1 million won, she would want to buy lots of food.
– If she became invisible, she would much rather not become invisible. (50 Q&A)
– Happiest moments of her life is small goals throughout the day.
– Her Personality: A detail-oriented and honest person.
– She’s close to Universe Ticket contestant Laura.
– Her Motto: “Let’s enjoy everything I do.”
– Youngseo was the 2nd I’LL-IT member to be revealed.
– She officially left I’LL-IT (before the re-brand to ILLIT) and BE:LIFT Lab on January 5, 2024.
– She is still close to the members of ILLIT.
– The reason why she went to THEBLACKLABEL was because she felt that she could make the music she loves.
– She made her official debut as a member of ALLDAY PROJECT, under THEBLACKLABEL, on June 23, 2025.
– On DISPATCH, she introduced herself as a cat.
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Note 2: Source for MBTI – Vogue Korea interview.
Note 3: Her height was confirmed during a fansign event.
Profile Made by ST1CKYQUI3TT
(Special thanks to: brightliliz, no, Jaja, @adprojectpics, @jiyoonappa, Seonghwa☆彡☆ミ)
Related:
ALLDAY PROJECT Members Profile
ILLIT Members Profile
“R U Next?” Profile Film:
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