@Yi Hojoon Thank you for your post!
Please use invoice time range to compare charges with the invoice:
https://learn.microsoft.com/en-us/azure/cost-management-billing/understand/review-individual-bill#compare-billed-charges-and-usage-in-cost-analysis
The costs are finalized 72 hours after billing period is closed https://learn.microsoft.com/en-us/azure/cost-management-billing/costs/understand-cost-mgt-data#cost-and-usage-data-updates-and-retention
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