If that is the case, the twelfth night may have become the tenth night and the ninth night. Of course, it may have been the thirteenth night, because the "break-in" of outsiders has become the twelfth night.

These are all possible things, and need to be verified by Lumian himself.

He fully agrees with his sister's reasoning just now, and believes that something must have happened in "Twelfth Night" to cause the cycle to occur. Only by figuring out what happened at that time can it be possible to find the key to breaking the cycle.