Below is my understanding of the ending.
There are infinitely many rooms, the items in each room will be synchronized, the things that do not belong to the room will only stay in one of them, and the random room will appear when the door is opened. The person in the room must have a key in hand, and not an object, to open the door and go where he wants to go. At the end, the male protagonist kills the living thing and turns it into an item. Before the living thing has died, he opens the door and gives the key to the female protagonist, because once he becomes an item, he cannot choose the outside from the inside. After entering room 8, it becomes an item, which is synchronized to each room, and when I see my daughter, through the induction between the items and the mutual induction with the key outside, the hostess chooses the room where both the host and the daughter are when she opens the door. Reunion!
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