Group Members

Siyoon (Billlie) Profile, Bio, & Facts 

Siyoon (Billliie)
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Siyoon (시윤) is a South Korean singer and a member of the K-pop girl group Billlie under Mystic Story Entertainment. 

Siyoon (Billlie) Profile

Stage NameSiyoon (시윤)
Birth NameKim Siyoon (김시윤)
BirthdayFebruary 16, 2005
Active Years2020–present
Age19 (in 2024)
Zodiac SignAquarius
Height 170.5 cm (5’7″)
Weight52 kg (114 Ibs)
Blood TypeB

Siyoon (Billlie) Facts:

Early Life

– She was born in Geumcheon-gu , Seoul, South Korea.
– Her early exposure to the entertainment world includes features in TV performances and dancing videos during her childhood.

Personal Life

– Siyoon’s fandom name is Unicity, and her logo features a chick popping out of an egg.
– According to members, Tsuki and her are most likely to binge-watch an entire series on a weekend. (Kpopconcerts)
– She enjoys Japanese conversations with Haruna.
– Maintaining a diary is among her hobbies.
– According to Suhyeon, she is most likely to be the last survivor in a zombie apocalypse.
– She expresses a desire to experience cuteness, she would like to live like Haruna for a day.
– Before joining Mystic Story as a trainee, she attended Def Academy and Millennium Dance Academy.
– She would choose cotton candy as an icecream flavor that resembles her. (The Seoul Story)
– In 2015, she was highlighted in a Reuters article about aspiring K-pop trainees.
– She held the titles of the tallest and youngest member in Mystic Story Girls, she stands out among her peers.
– Her nickname was a “star” when she was in her monther’s womb. (Cosmopolitan)
– Her friendship with cube trainee Yu Gaeul traces back to their partnership during their time at Def.
– She can impersonate a crow.
– Known to be emotionally expressive, she is quick to shed tears.
– She has a close bond with Tsuki.
– She has the charm to nail the stage with her eyes. (Nylon Music)
– She upholds the motto “It will work out/ I can do it.”
– She is a role model is Seulgi from Red Velvet and Moon Sua. (Popkorn)
– Performing her first listen stage with Doyoon (former pre-debut member) on May 30 marked a significant moment in her journey.
– Yellow is her favorite color.


– In 2009, at the age of 4, she made her television debut on the SBS reality show Star King as part of the Baby Wonder Girls, where they performed “Nobody.” Notably, another member of this group was Chaein from PURPLE KISS.
– During her second year of middle school, she attended a MYSTIC Story audition, successfully passing and joining the company as a trainee.
– From 2020 onwards, Siyoon’s journey led her to be officially introduced as a trainee under MYSTIC Rookies on February 18, 2020.
– Subsequently, she was announced as a member of MYSTIC Story’s much-anticipated girl group, Billlie. 
– She made an appearance in BOYFRIEND’s “Love Style” teaser.
– She is a regular model for Popteen, a renowned Japanese teen fashion magazine.

Instagram: see_uniuni
Twitter: SEE_UniUni

Streaming Platform Links
Genie | Bugs | Melon

Siyoon Photos

Note: How did you get to know Siyoon? Mention your story in the comments section and also share more facts with us if you know!

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Park Emma

I'm a big fan of K-pop, especially the group EXO, and Baekhyun is my Bias. When I'm not writing about K-pop, I enjoy reading books. Join me as I explore the world of K-pop and literature through my writing.

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