The First Floor of the World in the City

Li Mu accidentally got a small building that no one wanted. He never thought that this small building was magical and had many wonderful features. There is an elixir in the building that will keep you young forever! There is a good prescription in the building, and the medicine will cure the disease! There is technology in the building that changes the world. So the rich said that everything they asked for was there, scientists had discovered a new world, celebrities said it was their holy land, and criminal thieves said it was a devil's cave. Gradually, everyone calls it the best building in the world.