2026 ST Unitas (Youngdangi/Gongdangi) — academy cloud PII leak (count unpublished)

ST Unitas, operator of major Korean adult-education brands including Youngdangi and Gongdangi, posted member notices around 4–5 June 2026 confirming that some personal information leaked via a cloud-based academy management system. News1/Nate reporting said general members’ email, name, date of birth, gender, and phone number were in scope; members who processed refunds also had approval metadata, amounts, and refund account numbers exposed. The company said it blocked unauthorized access and reported to authorities. Attested headcount not published in the notices summarized by press; company-confirmed.