Privacy summary

Who we are

gyosil.app is operated by 드림드림 (Dreamdream), a sole proprietorship in the Republic of Korea (business registration no. 706-61-00813). We comply with Korea’s Personal Information Protection Act. The policy covers gyosil.app, its subdomains and mathking.site; where a service has its own policy, that policy takes precedence.

What we collect

• Single sign-on: name, email address and profile picture from the user’s Google account. We never collect passwords.
• Automatically: access logs, browser type, device information and cookies, used for service improvement and security.
• Inquiries: email address and message.
• Bookmoon reader submissions: nickname, school and grade (optional), the submission and up to three photos (optional), and confirmation of guardian consent. We do not ask for real names; submissions are forwarded to the operator by email.

Why we use it

• Identifying members and keeping them signed in across services
• Providing the service, fixing errors and preventing abuse
• Answering inquiries and reviewing reader submissions
• Showing ads and measuring usage

Retention

Data is deleted without delay when an account is closed or its purpose is fulfilled. Sign-in session cookies last up to 30 days and are deleted on sign-out.

Processors

We never sell or share personal data. We use the following providers to run the service:

• Vercel Inc. — hosting
• Supabase Inc. — sign-in and account storage
• Anthropic PBC — producing News Classroom and Bookmoon content (no user personal data is sent)
• Google LLC — Google sign-in and advertising (AdSense)
• Resend, Inc. — forwarding Bookmoon reader submissions to the operator

Providers used only by an individual service are listed in that service’s own policy. For example, Dadeum sends student writing to OpenAI for AI feedback, as described in the Dadeum privacy policy.

Providers used only by an individual service are listed in that service’s own policy.

Children

Our services include tools used by elementary school students. Personal information of children under 14 is processed only with consent from a legal guardian or through school procedures, and screens that students use show no ads. See also our AI safety and child protection policy.

Your rights and contact

Users and legal guardians may request access, correction, deletion or suspension of processing at any time. Privacy officer: 장진수, 드림드림 — jinsyu@gyosil.app. Full policy in Korean: 개인정보처리방침.