Last updated November 4, 2026
We are unglazed (“Company,” “we,” “us,” “our”), a company registered in South Korea at 23, Bongeunsa-ro 50-gil, Gangnam-gu, Seoul 06145. Our VAT number is 8333601655.
We operate the mobile application Lightning TOPIK (the “App”), as well as any other related products and services that refer or link to these legal terms (the “Legal Terms”) (collectively, the “Services”).
You can contact us by email at ung@sai-korean.com, or by mail to 23, Bongeunsa-ro 50-gil, Gangnam-gu, Seoul 06145, South Korea.
These Legal Terms constitute a legally binding agreement made between you and unglazed concerning your access to and use of the Services. By using the Services, you agree that you have read, understood, and agreed to be bound by all of these Legal Terms. If you do not agree with all of these Legal Terms, you must discontinue use immediately.
Lightning TOPIK is a vocabulary app for the Test of Proficiency in Korean (TOPIK): word cards with moving pictures and audio, a study plan paced to your exam date, scheduled reviews, and a widget (on iPhone, on the lock screen; on Android, on the Home screen). It is offered for iPhone on the App Store and for Android on Google Play. The information provided when using the Services is not intended for distribution in any jurisdiction where such distribution would be contrary to law.
On iPhone:
On Android:
Source attribution (KOGL Type 1). Word levels use the “Vocabulary and Grammar Level List” from the 2017 study on applying the International Standard Korean Curriculum (Stage 4) by 김중섭 and 13 co-researchers, published by the National Institute of Korean Language in 2017 under KOGL Type 1 (Korea Open Government License, Attribution). Free download: korean.go.kr. Levels follow this curriculum, which is aligned to TOPIK levels 1 to 6. This is not an official TOPIK word list, and this app is not affiliated with or endorsed by the National Institute of Korean Language. The App’s Profile links to this download; this section is the full credit.
We are the owner or the licensee of all other intellectual property rights in our Services, including the App’s design, word pictures and their motion, example sentences, study plans, graphics, and software. Provided you comply with these Legal Terms, we grant you a limited, non-exclusive, non-transferable license to use the App for your personal, non-commercial use.
Trademarks. TOPIK (Test of Proficiency in Korean) is a registered trademark in Korea of the Republic of Korea (Ministry of Education) and is administered by the National Institute for International Education (NIIED). Other test names and trademarks belong to their respective owners. Lightning TOPIK is an independent study app and is not affiliated with, endorsed by, or sponsored by NIIED, the Ministry of Education, or the National Institute of Korean Language.
The App helps you study. We do not guarantee any score or result in TOPIK or any other examination, and the study plan and review schedule are estimates.
By using the Services, you represent that: (1) you have the legal capacity to agree to these Legal Terms; (2) you are not a minor in the jurisdiction in which you reside, or you have received parental permission to use the Services; (3) you will not use the Services for any illegal or unauthorized purpose.
You may not access or use the Services for any purpose other than that for which we make them available. You agree not to: systematically retrieve data from the Services to create a collection or database; circumvent or interfere with the App’s purchase or security features; attempt to reverse engineer the App; or use the Services in a manner that violates applicable law.
The App relies on Apple (App Store purchases and on-device frameworks), Google Analytics for Firebase (usage events), and, on Android, Google Play (purchases) and Google AdMob with its User Messaging Platform (ads and consent). We are not responsible for third-party services’ availability.
We reserve the right to modify, suspend, or discontinue all or part of the Services at any time without notice. We will not be liable to you for any modification, suspension, or discontinuance.
THE SERVICES ARE PROVIDED ON AN “AS-IS” AND “AS-AVAILABLE” BASIS. YOU AGREE THAT YOUR USE OF THE SERVICES WILL BE AT YOUR SOLE RISK. TO THE FULLEST EXTENT PERMITTED BY LAW, WE DISCLAIM ALL WARRANTIES, EXPRESS OR IMPLIED, IN CONNECTION WITH THE SERVICES AND YOUR USE THEREOF.
TO THE FULLEST EXTENT PERMITTED BY LAW, IN NO EVENT WILL WE BE LIABLE TO YOU FOR ANY INDIRECT, CONSEQUENTIAL, EXEMPLARY, INCIDENTAL, SPECIAL, OR PUNITIVE DAMAGES ARISING FROM YOUR USE OF THE SERVICES.
These Legal Terms shall be governed by and defined following the laws of South Korea, without regard to its conflict of law principles. Nothing in these Legal Terms limits the rights you have as a consumer under the laws of the country where you live.
We may revise these Legal Terms from time to time. The updated version will be indicated by an updated “Last updated” date. By continuing to use the Services after revised Legal Terms are posted, you agree to be bound by the revised terms.
To resolve a complaint regarding the Services or to receive further information regarding use of the Services, please contact us at:
unglazed 23, Bongeunsa-ro 50-gil, Gangnam-gu Seoul 06145 South Korea ung@sai-korean.com