C147 Plenipotentiary

"Listen, who's talking?" Gu Xi asked Green Bamboo, and Green Bamboo listened attentively for a while more, but nothing happened.

Not long after, a thin voice called from outside the window. Gu Xi quickly took a few steps forward and opened the window, only to see two people standing outside.

The two of them were both dressed in black. If one didn't look carefully