The apartment is a seven-storey building.

The room where the homicide happened happened to be on the seventh floor. When the two came here, there was a rental advertisement posted on the door.

The owner of the real estate agency took it off, folded it and put it in his pocket:

"There is no elevator in this apartment, but young people have good physical strength, and there is no harm in climbing more stairs."

With that said, he took out the key and inserted it into the lock cylinder, turned the handle and pulled it back.

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