SIYOON
Billlie · Main Rapper · Lead Dancer
Profile
SIYOON is a South Korean rapper and dancer in Billlie. She also performs alongside MOON SUA in the group’s first official subunit.
She performs with MOON SUA, SUHYEON, HARAM, TSUKI, SHEON, SIYOON and HARUNA as a member of Mystic Story’s seven-member team.
Career Milestones & Individual Activities
First full-length album
Participated in Billlie’s the collective soul and unconscious: chapter two, led by ZAP and WORK.
MOON SUA X SIYOON · SNAP
Debuted in Billlie’s first subunit with SNAP (feat. sokodomo); both members co-wrote lyrics. This is a duo release.
Japanese group debut
Billlie released the Japanese version of GingaMingaYo.
Billlie debut
Debuted with Billlie’s first mini album and RING X RING.
Official SNS
News & Further Reading
Explains how story connects sound, concept and emotion.
EARMILK · December 27, 2025SIYOON · Artist interview ↗Discusses developing lyrics from musical imagery.
allkpop · November 28, 2025SIYOON · Interview ↗Reflects on the group’s first music-show win.
HelloKpop · June 2, 2025MOON SUA X SIYOON interview ↗The pair discuss SNAP and their songwriting.
Victor Entertainment · OfficialOfficial member profiles ↗Birth dates and performance roles.