Master Xue came, and she left, and moreover, she very ungracefully stated that the paper Meng Yu prepared had nothing to do with her.
She wouldn't submit Meng Yu's paper, and she advised Meng Yu not to submit it either!
This disappointed Meng Yu greatly.
In Great Wu, Meng Yu taught several members of the Liu Family the basics of Alchemy. As for the reason, he was going to establish his own kingdom and expand his power, of course, one person wasn't enough for the task of Alchemical Elixirs, having people to assist him was very good.
Liu Qingshuang had a foundation in Alchemy and a solid knowledge of pharmacology; she benefited from Meng Yu's generosity and researched tirelessly, day and night.
The Liu Family also had many secret recipes, from which Meng Yu benefited a lot. Then, he organized some of the content and wrote a paper, asking Master Xue to help him publish it.