Hey @정다은, thanks for reaching out!
I can see you’ve already reached out to our support team (ticket #2003310), so our billing team will be able to look into your account directly and confirm exactly why this charge went through.
Just to share some general context in the meantime: when a plan is cancelled, any seat changes or usage from the final billing period can sometimes still generate a charge before the cancellation fully takes effect. You can find more on how this works in our Upgrade or downgrade your plan article, in the "Downgrade or cancel your plan" section.
For anything specific to your account, that's best handled through your support ticket for security and privacy reasons. Someone from the team will follow up with you there directly.
Feel free to reply here if you have any other questions about how cancellations work!