Please tell me about the fee for reissuing a SIM, etc.

For the time being, the reissue fee is free of charge regardless of SIM card/eSIM.
If your eSIM settings are not successful or you want to set them again on the same device, you do not need to reissue your eSIM. Please check again if there are any errors in your eSIM settings or communication usage settings.

You can also check your phone number from your profile by tapping the human icon in the upper left of the app's home screen. Even if the phone number is not displayed on the device settings screen, it is not a problem.