Yesterday, an unexpected error occurred.
The cause of the error is still unknown. We rebooted the AWS (Amazon Web Services) server, and it works fine now.
We strongly suspect AWS missteps, but we have no evidence.
Hacking into the server or Structural problems were not found.
In any case, indeed, we did not respond immediately. This is because the error occurred at midnight in Korea.
We apologize for the inconvenience.
