C405 Yin Yizheng's Whereabouts

Under Tang Fei's gaze, the old man slowly opened his mouth and said, "This is the core secret of our Martial Alliance. If you want to know, ask your master later!" If he tells you, then I'll tell you too. If he doesn't tell you, then even I can't do anything about it! As for the grading of the potions, your master has already made up his mind. Moreover