Hi @김성모 - Welcome to the Atlassian Community!
Please see this article on how to delete your site. Sorry it is all in English.
https://support.atlassian.com/atlassian-cloud/kb/reset-and-delete-all-data-from-your-cloud-site/
Online forums and learning are now in one easy-to-use experience.
By continuing, you accept the updated Community Terms of Use and acknowledge the Privacy Policy. Your public name, photo, and achievements may be publicly visible and available in search engines.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.