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It started with a sound. Not loud. Not violent. Just a small knock. At first, everyone in the apartment thought it came from the pipes. Old buildings make noises all the time. Nobody paid attention. Then it happened again. Knock. Knock. Knock. But this time… it wasn’t in the walls. It came f…

It started with a sound. Not loud. Not violent. Just a small knock. At first, everyone in the apartment thought it came from the pipes. Old buildings make noises all the time. Nobody paid attention. Then it happened again. Knock. Knock. Knock. But this time… it wasn’t in the walls. It came from under the floor. The tenant in Room 3B sent a message to the building group chat at 2:11 AM: “Is anyone doing construction right now?” No one replied. A minute later another message appeared.