Note: This is the Korean-language forum. However, since you posted in English, I will respond in English.
Hi 승기 강,
I’m sorry to hear that your account has been compromised.
From your description, it appears that someone may have gained access to your Microsoft account and changed the sign-in alias to a @bibimail.net address, which would explain why you can no longer sign in using your original email address.
Please note that Microsoft Q&A is a public community forum staffed by volunteers and moderators. We do not have access to Microsoft accounts, account databases, security records, billing information, or account recovery systems.
Because of this limitation, we cannot verify account ownership, investigate account activity, reverse alias changes, restore account access, or manually recover the account on your behalf.
If you have not already done so, please submit the Microsoft Account Recovery Form: https://account.live.com/acsr.
When completing the form, provide as much information as possible, including:
- Previous email addresses associated with the account
- Xbox gamertag information
- Purchase history or order details
- Billing or payment information previously linked to the account
- Any other information that may help establish ownership
Since account recovery is handled through Microsoft's account recovery process, the recovery form is the primary path available for regaining access to a compromised account. Providing accurate and detailed information will give you the best chance of successfully demonstrating ownership.
I understand how concerning this situation is, especially if Xbox purchases, subscriptions, or payment methods are associated with the account. I sincerely hope you are able to recover it.