Hello @Ko Yoora_lyra_
Welcome to the Atlassian community.
You can set up a project within a Jira instance and limit the access to it to specific individuals. This may require adjusting access and permissions on the other projects in the instance to ensure the specified user don't have access to those other projects, if that is also required.
You could also set up a new, separate Jira instance for just the one project. You could then grant access to that one instance to only the people who need access to that project.
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