''The other player is on the first floor but quite far from here. We need to go to the top floor. The monster goes there'' Using the system map that shows all this mansion he can see from the screen that the other player is still lurking in this mansion but on the first floor. Although he is already familiar with this place because this is was where he stay when he was in the past timeline. But ten years already passed, there is no way this mansion will stay the same as when he still stays in this mansion.
Maybe all the maid and guards that know him ten years ago already died. Either they were sent out from this mansion by the paranoid Lady Dianne or killed by a monster and infected by the curse and become a monster.