Mia didn't seem to care about what Rean said, though.
"Explain."
Rean nodded.
"This is an extremely useful communication technique. Sooner or later, others will find out. Not only that, if you really find a way to hide it, they will take harsher measures to find out the truth. It's simply impossible for the Sect to hide how it works because of how large and simple it is. Besides, even if you tried to protect the places where the cables are connected, you can't protect every single one of them. This system can totally cover hundreds of cities. The other Sects and Royal Family only need to check one of those cities to find out."
