Y:SY (Lee Seoyeon ex fromis_9) Profile and Facts:
Y:SY is a South Korean singer-songwriter and rapper under H1GHR Music. She is a former member of the girl group fromis_9. She made her solo debut with the digital single “Naked” on November 17, 2025.
Official SNS:
Instagram: im_theyeon
YouTube: 이서연 (Y:SY)
TikTok: @ysyeoon
Stage Name: Y:SY
Name: Lee Seo Yeon (이서연)
Birthday: January 22, 2000
Zodiac Sign: Aquarius
Chinese Zodiac Sign: Rabbit
Height: 158 cm (5’2″)
Weight: 47 kg (104 lbs)
Blood Type: A
MBTI Type: ISTJ
Representative Emoji: 
Lee Seoyeon Facts:
– Hometown: Seoul, South Korea.
– Family: Father (born in 1966), mother (born in 1967), 2 older brothers.
– Education: SOPA (but she gave up in order to pursue her music career)
– She was a trainee for 7 years, 9 months. She was a trainee since she was in fourth grade, at YG Entertainment, and was a part of the YG trainee group named “Future 2NE1”.
– Seoyeon appeared in GD&TOP’s “Knock Out” MV.
– She debuted as a member of fromis_9 on January 24, 2018, under Stone Music Entertainment.
– Nickname: Sleepy Head, Baby Panda.
– The members call Seoyeon “Baby Panda”.
– Seoyeon likes romance, hero, and animation movies.
– Seoyeon likes Tori Kelly, Rihanna, Dean, Heize, and Arin from Oh My Girl.
– Seoyeon likes BMO from Adventure Time and has many BMO merchandise.
– Seoyeon has a lot of chokers.
– Favorite Color: Red, Black.
– She really likes gummy bear candy and milk tea.
– She almost burnt the Fromis_9 dorm during FB live.
– Chaeyoung said that her first impression of her was that she was very chic.
– She is good at learning choreographies.
– She and Jiheon are the most fashionable members of Fromis_9.
– Seoyeon’s nickname is “Sleepy Head” because she has big dark circles under her eyes naturally. In the early days of Idol School, people thought she had the circles because she wasn’t sleeping. Her big dark circles had appeared already during her childhood.
– When Seoyeon sleeps, she likes to stretch her hand over her head.
– She is known as a big fan of the girl band OH MY GIRL, along with Nagyung. She’s a fan of OH MY GIRL’s Arin.
– Seoyeon’s favorite colors are black and red. The members presented her a red knit as a birthday present.
– She does not have SNS. According to Instagram Live with Shin Si-a (신시아), whom has a great friendship with her, her father’s objection was severe, and she could not create an account.
– Seoyeon has some kind of aquaphobia, she is afraid of water.
– Seoyeon is good at learning choreography.
– She can do popping dance (TBS fact in the star 2018).
– Seoyeon ranked 7th in Idol School with 61,083 votes.
– Motto: “Even if both doing and not doing things will end up as a regret. Let’s go with do things and regret”.
– Seoyeon is the oldest unnie of Bbang bbang (2000 liners) of Fromis_9.
– Attractive Point: Waist.
– She really likes when Hayoung cooks her kimchi fried rice and soybean paste stew.
– When she’s writing songs she thinks about the members first and thinking about the members makes her think of Flovers. And she thinks of Flovers clapping along to the song with them.
– She got her own music studio.
– She has a cat, which her aunt gave her.
– Seoyeon departed from fromis_9 after her contract expired on December 31, 2024.
– On July 23, 2025, she was announced as an artist under H1GHR Music after signing an exclusive contract.
– She officially debuted as a soloist on November 17, 2025, with the digital single “Naked,” using the stage name Y:SY.
Dramas:
Welcome to Heal Inn (VLIVE, 2018)
TV Shows:
Idol School (Mnet, 2017)
Music Videos:
GD&TOP – KNOCK OUT (2010)
이서연 (Y:SY) – NAKED (2025)
Profile made by: “felipe grin§”
Additional information provided by ST1CKYQUI3TT, Ario Febrianto, Renshuxii, peachy-pb, Tracy.
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Related: fromis_9 Members Profile
Latest Release:
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