Hello @Sanghoon Yang !
In your case i would create a Subscription and move supported resources into
https://learn.microsoft.com/en-us/azure/azure-resource-manager/management/move-support-resources
Then you can change Subscritpion Directory aka Tenant and you are good to go!
I hope this helps!
Kindly mark the answer as Accepted and Upvote in case it helped!
Regards