I'd like to cancel my subscription and make a refund.

junehyunglim, good evening.
If it is within 14 days from the order, it can be canceled by canceling the following procedure.
All fees already paid will be refunded.

https://helpx.adobe.com/manage-account/using/cancel-subscription.html

There will be no refund after 14 days.

https://www.adobe.com/legal/terms.html