He didn't think that after feigning as a master teacher for so long, such that everyone had already believed him to be real... that he would stumble on the lack of trivial knowledge.

If he knew that there aren't any poison masters in Tianxuan Kingdom, he would have never said such words!

Even though there are books on poison in the kingdom's Book Collection Vault, they are more for record purposes. They are fundamental books on the uses of poisons, just like the elementary books in the Apothecary Guild's basic tier book collection vault. Advanced concepts for poison masters are not covered. Thus, Zhang Xuan was ignorant of such facts.

It is no wonder that Liu Ling and the others are growing doubtful of him. He doesn’t even possess basic knowledge that even commoners are aware of.

Even though he felt dismal at giving himself away, Zhang Xuan knows that the dice has been cast, and it is too late to regret now. If he were to say that he can't treat the old ancestor, the others would d