Privacy Policy
Effective: October 26, 2026
Gyeongtae Park (the "Operator") runs Market Rewind (market-rewind.com, the "Service") and sets out this privacy policy to protect users' personal information and handle related requests under Korea's Personal Information Protection Act. This is a translation of the Korean original. If the two differ, the Korean version prevails.
1. What we process and why
We process only the minimum personal information needed to run the Service, and use it for no purpose other than those below.
| Who | Information | Purpose |
|---|---|---|
| All users (anonymous account) | A randomly generated account ID; game records (scenario, difficulty, orders and fills, progress, results) | Running the game; saving games in progress and records |
| Users who sign in with Google | Google account ID, email address, name, profile picture URL | Sign-in and identity verification; continuing on other devices |
| Users who set a nickname | Nickname | Showing rankings |
| Generated automatically during use | IP address, browser and device info, access times, usage logs | Security, abuse prevention, troubleshooting |
| Users who contact us | Email address, name (if shown in the email), message content | Answering and handling requests |
The Service shows no ads and uses no analytics or tracking tools.
2. Retention and deletion
- Account information, game records, nickname: kept until you ask to close your account or the Service ends, then deleted promptly.
- Automatically generated access logs: deleted automatically after the retention period set by our hosting and database providers (typically a few days to a few weeks).
- Contact emails: kept for 1 year after your request is handled, then deleted.
Electronic records are deleted so that they cannot be recovered. We do not keep personal information on paper.
3. Sharing with third parties
We do not provide your personal information to third parties, except where required by law or requested by investigative authorities through legal procedures.
Once rankings open, signed-in users' nicknames and the return and rank of their ranked games are shown to other users. Email addresses and names are never shown.
4. Processors and international transfers
We entrust the processing of personal information to the companies below to run the Service. They are U.S. companies, and personal information may be processed outside Korea as described. Transfers happen over the network as you use the Service.
| Recipient | Task | Information | Country | Retention |
|---|---|---|---|---|
| Supabase, Inc. (supabase.com) | Database and sign-in | Account, game records, nickname, and access logs from section 1 | Stored in Korea (Seoul region); company in the U.S. | Until the contract ends or the periods in section 2 |
| Vercel Inc. (vercel.com) | Website hosting and server functions | Access logs (IP address, browser info, etc.) | Runs in Seoul, Korea; may be processed in the U.S. and elsewhere | Vercel's log retention period |
| Google LLC (google.com) | Receiving contact emails (Gmail) | Email address, name, and message of users who contact us | U.S. and elsewhere | The contact email period in section 2 |
If you don't want your information transferred abroad, you can stop using the Service and ask to close your account. The Service can't run without these providers.
Information you give Google while signing in is governed by Google's privacy policy.
5. Your rights
You can ask at any time to access, correct, or delete your personal information, or to stop its processing. You can change your nickname yourself in the Service; send other requests to pgt0409@gmail.com. We will verify your identity, handle the request within 10 days, and tell you the result.
A legal guardian or someone you authorize may also make requests, with proof of the authorization.
6. Children under 14
Only people aged 14 or older can create a signed-in account. If we learn that a child under 14's personal information was collected without a legal guardian's consent, we delete it promptly.
7. Browser storage and cookies
The Service stores only what it needs to work in your browser.
- locale cookie: remembers your chosen language (1 year).
- Sign-in session (browser storage): keeps your anonymous or signed-in session.
- Tutorial completion (browser storage): decides whether to suggest the tutorial to first-time players.
You can block or clear cookies and site data in your browser settings. If you clear the sign-in session, you lose access to records made without signing in, and blocking storage makes the Service hard to use.
8. Security measures
- All traffic is encrypted with HTTPS.
- Row-level access rules let users read only their own records, and only the server can change records.
- Administrative secret keys are kept on the server only, and only the Operator can access the admin console.
9. Privacy officer
For privacy questions, complaints, or remedies, contact:
- Privacy officer: Gyeongtae Park (Operator)
- Contact: pgt0409@gmail.com
10. Remedies
For advice or dispute resolution on privacy violations, you can also contact these Korean agencies:
- Personal Information Dispute Mediation Committee: 1833-6972 (www.kopico.go.kr)
- Personal Information Infringement Report Center: 118 (privacy.kisa.or.kr)
- Supreme Prosecutors' Office: 1301 (www.spo.go.kr)
- Korean National Police Agency: 182 (ecrm.police.go.kr)
11. Changes to this policy
This policy applies from October 26, 2026. Changes are announced in the Service at least 7 days before they take effect, or 30 days for changes that significantly affect your rights.