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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. I…

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