Yoon
STAYC
4th Gen (commonly-cited era, approximate)Verified facts
Real nameSim Ja-yoon
Birthdate2004-04-14
Group debut2020-11-12
Group size6 members
Stats — real computed numbers, never invented ratings
All facts are sourced from public profiles/Wikipedia and verified before being added. Age and years active are computed from today's date, not a fixed snapshot.