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Send us an email and we'll get back to you within 1–2 business days.

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Help with accessing purchased files, download issues, or account-related questions.

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For refund inquiries due to technical issues or billing errors. Please contact us within 48 hours of purchase.

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Questions about our e-books, guides, or educational materials.

✓General inquiries: within 1–2 business days
✓Refund requests: within 1 business day (please submit within 48 hours of purchase)
✓Technical issues: within 1 business day

Business hours: Monday – Friday, 10:00 AM – 6:00 PM KST (UTC+9)