• Stage Name: Siyoon
    Birth Name: Kim Siyoon

    Group: Billlie
    Position: Rapper, Dancer

    Birthday: February 16th, 2005

    Zodiac Sign: Aquarius

    II. Career

    I. 2020–present: Billlie

    She was officially revealed as a trainee under MYSTIC Rookies on February 18, 2020.

    She was later announced as a member of MYSTIC Story's upcoming girl group Billie.

    III. Siyoon Facts

    – She attended Def Dance Academy and Millennium Dance Academy prior to becoming a trainee at Mystic Story.

    – As a young child, Siyoon was featured in various TV performances and dancing videos.

    – She appeared in BOYFRIEND’s ‘Love Style’ MV teaser (her audition).

    – Siyoon was featured in a Reuters article about aspiring K-pop trainees in 2015.

    – Siyoon passed her audition in April 2019. She became a trainee at Mystic around the same time as Haram.

    – She is a regular model for Popteen, a Japanese teen fashion magazine.

    – Her fandom name is Unicity. Her logo is chick popping out of an egg.

    – Her nicknames are positive energy and lovely.

    – Her role in the team is positive/calm action.

    – Her hobbies are speaking Japanese with Haruna in her room, and diary writing.

    – Her special ability is making 10 hearts.

    – Her role models are IU and Blackpink’s Lisa.

    – The song she sang for her audition is an Heize song.

    -She would like to live like Haruna for a day because she is cute.