C4 Concentration Control(last Part)

It happened in an instant. It came too suddenly. Nangong Yu had no time to think at all. The dagger that carried a cold killing intent emitted a light blue light, like the brightest star in the dark night sky. It was dazzling, even dazzling. This was the light reflected by the poison on the dagger. In Nangong Yu's eyes, it was undoubtedly the light of death