Contact
Contact
Last updated: 2026-08-23
INLEVEL9 (인레벨나인) is a registered business in Seoul, Republic of Korea, and the publisher of the INLEVEL9 Letter. Every inquiry — subscription, membership, partnership, or correction — reaches the same address below, and a person reads and answers it.
What to write about
Naming the topic in your subject line gets you a faster answer.
| Subscription and delivery | Your subscription is not confirmed, issues are not arriving, or you want to stop receiving them. The unsubscribe link in any issue also works immediately. |
|---|---|
| Membership and billing | Payment method changes, receipts, refunds, and cancelling a recurring plan. Write from the address you paid with. |
| Corrections | A factual error in a published issue. Send the issue URL and your evidence; confirmed corrections are noted in the issue itself. |
| Press and citation | Contributions, interviews, and questions about quoting this newsletter. |
| Partnerships | Branded content, licensing, and internal redistribution. |
| Privacy requests | Access, correction, deletion, or suspension of processing. Handled per the privacy policy. |
Response times
We aim to reply within two business days. Billing and delivery issues are handled first. Inquiries are retained only for the period stated in the privacy policy.
Business registration
| Legal name | INLEVEL9 (인레벨나인) |
|---|---|
| Service | INLEVEL9 |
| Representative | Kwangseob Ahn |
| Business registration no. | 735-23-01161 |
| Mail-order sales registration | 2026-서울영등포-0851 |
| contact@inlevel9.com | |
| Phone | 010-7659-8163 |
| Address | 4314, 4F, NH Foundation Building, 2, Gukjegeumyung-ro 8-gil, Yeongdeungpo-gu, Seoul, Republic of Korea |