"Can you cure the poison in my body?" Dugu Bo finally put aside his pride and couldn't help but ask.
Tang San replied indifferently, "Even if I could, I wouldn't cure you. You'd only be worse off than me. Just kill me. Perhaps you are not afraid of death yourself; after all, 'tis rare for a man to live to seventy—but alas, your granddaughter, as delicate as a flower and as pure as jade, probably won't last as long as you, and she might not have your willpower to endure the ever-increasing agony. The poison in her is bound to be more severe than yours, because she has been immersed in this toxin since she was in the womb."
To survive, Tang San made his final effort. When he first met the Biphosphorus Snake Soul Master Dugu Yan, he had his suspicions based on her appearance, for to his knowledge there was no one else in the world with her hair color and eye color. Furthermore, the Biphosphorus Snake poison she used made him even more certain later on.