Knowledge Of Drugs And Poisons

It had already been fifteen minutes since Li Rui had gone inside the room.

Outside the room, An Ju was feeling restless because she wanted to leave Yao Yue hall with Lady Li before her master would come back and find Lady Li missing.

She was about to go inside when she saw Li Rui stepping out of the room and An Ju finally released a sigh of relief.

Imperial Physician Xu stepped out of the room behind Li Rui.

He knew that now Li Rui will leave. Although he was unhappy and didn't want to let Rui go so easily, he knew that he could do nothing to stop her as the banquet was about to start again. 

Just as Li Rui was about to step out of Yao Yue hall, Imperial Physician Xu could not stop himself and finally asked her.

"This old man might be stepping out of his boundaries but if I may ask from where did My Lady get so much knowledge about poisons and their cure?"

Li Rui stopped and turned to look back at the old Physician.

"Books."