“ Deshabilitar conexión compartida ,” he whispered.

Mateo sent warnings. Polite emails. Then firm ones. Javier replied with a laughing emoji.

Across the building, a silent shockwave rippled. The cybercafé ’s customers suddenly stared at frozen screens. The law firm’s video conference with Madrid cut to black. The medical lab’s monitors flatlined into error messages.

He traced the usage to a rogue router in apartment 1402. A new tenant, a “digital content creator” named Javier, had installed a bypass. He was torrenting 4K movies, running three live streams, and hosting a private gaming server—all on the shared connection.

It started with the accounting office on the fifth floor. Their VPN kept dropping. Then the medical lab on the eighth floor complained that their telemetry data was lagging by seconds—seconds that could mean a misdiagnosis. Mateo ran his diagnostics, his fingers dancing over the keyboard. The graphs were unmistakable. Someone was leeching.

He pressed it.

For ten minutes, Mateo’s phone buzzed like a trapped hornet. He let it ring. Then he enabled the backup connection—a bare-bones, per-device authenticated network. No sharing. No freeloading.

And in apartment 1402, Javier’s game disconnected mid-raid. His stream went offline. His torrents stalled.

And for a network administrator, that was the only connection worth keeping alive.

On the 23rd floor of the Torre del Progreso , the air was always sterile—recycled, cold, and silent. But inside the cramped server room, Mateo, the network administrator, was sweating.