Unfortunately, Wooyun couldn't hear any more of their conversations as it had come to a close, or more like the trio were still standing there but weren't saying anything. This sight confounded him.
"What's going on?" He thought. Even from where he stood it looked like they were still discussing something but no words came out of their mouths.
He then heard the familiar hum of the book in his mind. Book, do you know something? He called.
[They are most likely the void resonance technique.]
Void resonance? What's that?
A mental link you form between you and others. It's a way to communicate with people without being heard.
Oh. His eyes widened slightly. Do you think they noticed as I was eavesdropping on their conversation?
[How could they not, you weren't being very subtle about it.]
