THE ANSWER IS IN THE BOX

And while Davel was still busy thinking about the password for the metal box, someone suddenly knocked on his door, and reflectively, he turned to look at the door.

Maybe it wasn't necessary, but he remembered the way people in this mansion usually knocked on his door. Aside from the maids, it was usually Heidi Clayton who came into his room and knocked on the wooden door, but for some reason, the white-haired man thought that it was not the woman who was knocking on the door at this time.

"Heidi Clayton usually knocked on the door three times, and each knock is separated by a full second to show she's not in a rush. However, the person knocking on the door right now looks like they're in a hurry judging by the way it's not even a second between knocks," muttered to himself, Davel tried to analyze the person who knocked on his door. But then the sound of the knocking repeated followed by screams from outside the door.