Wu Taisui's words instantly left Chen Yu in a state of utter bewilderment. The fourth key was himself? What kind of joke was this old man playing?
He was a living, breathing human being—how could he possibly be a key?
For a moment, Chen Yu stared blankly at Wu Taisui, a cascade of question marks flooding his mind. He had always been curious about the fourth key required to unlock Xiaoxitian, yet no one had ever spoken to him in detail about its existence.
Chapter 2291