Terms of Service

These Terms set out the conditions and procedures for using the AI-based language learning services of juin.com (the “Service”), and the rights, duties, and responsibilities of the Service and members.

• You may sign up with email or a social account (Google, Kakao, X, Naver). On first sign-up you must register a username and phone number.
• Only one account may be created per phone number. If a number is already registered, sign in to the existing account and link additional sign-in methods.
• Accounts are for personal use only and may not be transferred or lent. If you suspect account details were leaked, change your password immediately or contact support.
• Minors may use the Service with the consent of a legal guardian. Paid payments and subscriptions follow Article 6.

The Service provides language learning features such as Search, Reading, Writing, Speaking, Play, and Watch, plus AI drafting, translation, and feedback. The Service is currently in MVP; features may be added or changed over time. We will try to give advance notice of material changes or interruptions.

• Do not steal others’ information or register false information.
• Do not disrupt normal operation (unauthorized crawling, abusing automation, exploiting vulnerabilities, etc.).
• Do not post content that violates law or public order, or that infringes others’ rights.
• Do not copy or distribute the Service’s software, design, or content without permission.

• Rights in the Service itself (software, design, Service-provided content) belong to the Service.
• Rights in content you create (posts, memos, etc.) belong to you. The Service may use that content as needed to operate, improve, and promote the Service.
• Terms for AI-assisted content, copyright, and revenue sharing will be announced separately when related features launch fully.

• The Service may offer free and paid plans (e.g. Standard, Premium). Prices, benefits, limits, and billing cycles for paid plans are as posted in Settings → Subscription & emails; that screen controls, and we will notify you in advance of changes.
• Paid subscriptions are billed on the disclosed cycle (e.g. monthly) and may auto-renew until you cancel. You may cancel the next billing (stop auto-renewal) anytime in Settings → Subscription. If you cancel before the next billing date, no further charge is made; if a paid period remains, you keep plan benefits until it ends. There is no pro-rated refund for time already paid.
• Payments may go through domestic (e.g. Toss Payments) and international (e.g. Polar) processors, using cards or other methods they support. Approval, receipts, and overseas tax handling may follow the processor’s policies.
• Minors may use and pay for paid services with a legal guardian’s consent. Paying with a guardian’s card or wallet is allowed; consent and management of payment and renewals rest with the member and guardian. Payments without guardian consent may be withdrawable or cancelable as law allows.
• Some plans (e.g. Premium) may provide transferable access coupons (e.g. Standard period). Issuance, gifting, redemption rules, and validity follow the subscription settings screen and service notices. Free or gifted access periods are generally not cash-refundable, except overpayment or legally required cancellation of a paid charge.
• Paid plans are rights to use digital content and online software (SaaS). Withdrawal of consent may be limited once supply of reproducible goods or similar has begun under applicable law. We disclose this on payment screens or these Terms; completing payment is treated as agreement. Rights guaranteed by law are not excluded by these Terms.
• We do not refund already-paid periods for change of mind, low usage, use of other services, or other reasons without a Service defect. Cancellation still follows the remaining-period rules above.
• Refunds, cancellations, or settlement may apply under law and Service policy when:
  • Paid service cannot be provided, or is substantially hindered, for reasons not the member’s fault
  • A material defect prevents achieving the purpose of the contract
  • Performance differs from what was advertised
  • Duplicate payment for the same charge or system error overpayment is confirmed
  • Other cases where e-commerce or related law recognizes withdrawal or refund
  Scope, method, and timing of refunds are set case by case under law, processor policy, and actual use, and are generally returned to the original payment method.
• Refund, withdrawal, and overpayment requests go through 1:1 inquiry under Settings → Support. For payments via domestic (Toss Payments, etc.) or international (Polar, etc.) processors, some cancellations and refunds follow their procedures and timelines. Store-billed purchases may follow that store’s refund policy first.

Service may be temporarily interrupted for force majeure, maintenance, or outages. Liability is limited to the extent permitted by law; separate paid-subscription agreements and law take priority where they apply.

You may terminate the agreement anytime under Settings → Delete account. If you have a paid subscription, cancellation and refunds follow Article 6 and the subscription settings screen. On deletion, personal information is destroyed immediately under the Privacy Policy and cannot be recovered.

We may change these Terms when needed and will announce the effective date and changes in advance. Material changes that are adverse to members will be notified separately.

These Terms are interpreted under the laws of the Republic of Korea. Disputes about use of the Service should first be resolved amicably; if not, they are handled by courts of competent jurisdiction under applicable law. Contact us via 1:1 inquiry under Settings → Support.