Hello Yongsuk Kwon,
the hardware changes triggered BitLocker to require a recovery key. To find your recovery key, you can follow the steps in Finding your BitLocker recovery key in Windows - Microsoft Support.
Once you have the recovery key, enter it on the BitLocker recovery screen to unlock your device.
Important: Microsoft support is unable to provide, or recreate, a lost BitLocker recovery key.
Hope it helps.
Kind regards,
Lei