Tang Dynasty: Starting at Xuanwu Gate, this prince is better off not being one.

"Master, it can't be that bad. His Majesty banished me to Lingnan, not chased me into the mountains there. I don't need any of your medicines!"

"And realgar? This disciple doesn't need to sleep deep in the mountains, nor does he need snake-repelling substances..."

Listening to Li Yu's incessant chatter, Sun Simiao grew impatient and shooed him away, saying, "Get lost! Stop bothering this old man. Who said this is for you? This is for my own use."

"What are you going to do with all this, old man?" Li Yu was even more puzzled, since there weren't many places to gather herbs in Guanzhong at this time of year.

"Who said I was going to gather herbs? I'm planning to go to Lingnan with you, old man. There are so many poisonous insects and snakes there, how can we not catch them and study them?"

"What? You're going to Lingnan too?"

Li Yu was almost stunned by Old Sun's words and hurriedly asked, "If you go to Lingnan with your disciple, who will look after your medicine hut?"

Hearing Li Yu's words, Sun Simiao didn't even look up and said, "With your junior brother looking after the medicine hut, it won't collapse no matter what. Your junior brother can now diagnose and treat patients on his own, far surpassing you in ability."

"You never memorize medical texts when I ask you to, you never learn acupuncture when I ask you to, and you never even observe me treating patients. You've wasted your time as a disciple..."

The old man's words were so sharp that Li Yu felt utterly ashamed and could only weakly defend himself, saying, "I've only learned pulse diagnosis, so it's not entirely without merit..."

"Hey? You dare to talk back!"

Sun Simiao glared at him angrily and said, "Observation, auscultation, inquiry, and palpation are essential skills for any physician. You only know how to take the pulse, and you dare to boast about it? If you couldn't even learn the simplest pulse diagnosis, I would have expelled you from my school long ago!"

Knowing that Old Sun was just saying it in anger, Li Yu stopped trying to defend himself and instead smiled ingratiatingly, saying, "You're too kind. You've always been very protective of your disciple, so how could you bear to expel me from the sect?"

Seeing Li Yu's appearance, Sun Simiao first snorted coldly, and then said, "I am going to Lingnan not only because I am worried about you, but more importantly because I need to find some poisonous insects there, especially the leech venom that you mentioned to me before. Its venom can prevent blood clotting. If that is true, then I can use it to develop a medicine that can promote blood circulation and remove blood stasis."

Upon hearing this, Li Yu laughed and said, "If you want these things, I will bring them back to you. Why do you have to make the trip yourself?"

"What do you know?"

Sun Simiao said sternly, "I was an old acquaintance of the late Lady Xian. If I don't let you go and oversee things, why would Feng Ang give face to a mere child like you?"

"You and Madam Xian still have a connection?"

Li Yu was completely shocked, realizing that Lao Sun's connections were truly astounding. He was also glad that Lao Sun was a man of peaceful nature; if he had ambitions with his connections, even Li Er would have had a headache.

But after thinking about it, he realized that if Old Sun had been an ambitious person when he was young, he probably wouldn't have the good reputation he has today.

Thinking of this, Li Yu stopped saying anything and obediently began to assist Sun Simiao.

After finishing his work with Lao Sun, Li Yu went straight to the academy.

Since he hadn't been teaching at the academy for the past few days, Wen Yu had become the one teaching physics.

Ever since this guy made a name for himself in the court by proposing the idea of ​​horseshoes, the entire Wen family has been wholeheartedly supporting his research into physics.

This fellow was incredibly dedicated to this subject, studying the textbook Li Yu had given him day and night, and occasionally visiting the Prince of Zhao's residence to consult Li Yu. Therefore, with his current level of expertise, he could easily replace Li Yu as the instructor for some courses.

"Wen Yu, come here."

Seeing him lecturing enthusiastically on the podium, Li Yu had no choice but to call him over after he finished the lesson.

"Sir, what can I do for you?"

Following Li Yu to the "office," Wen Yu curiously asked the question that had been bothering her.

Seeing Wen Yu's ready-to-do attitude, Li Yu gave a wry smile and said, "You're much older than me, so don't call me 'sir' anymore..."

Seeing that Li Yu's expression didn't seem to be faking it, Wen Yu panicked and trembled for a long time before even considering kneeling down, but Li Yu quickly stopped her.

Knowing that this guy had misunderstood, Li Yu explained, "That's not what I meant. As you know, I'm about to set off for Lingnan. Although the academy is under the care of several senior scholars and there shouldn't be any problems, this university is primarily focused on science. Once I leave, you'll probably be the only one left to teach this subject, so I'd like you to take my place during this period."

"this……"

Upon hearing this, Wen Yu was initially shocked, then quickly waved his hands, saying, "How can this be? I have only been studying under you for a short time, and my knowledge is still shallow. How can I shoulder such a great responsibility?"

"Come on!"

Li Yu rolled her eyes at him and said irritably, "Try to shut that grin before you say that!"

Seeing that his little scheme had been exposed by Li Yu, Wen Yu scratched his head embarrassedly. But before he could speak, Li Yu continued, "However, I'm going to make you take my place, not just to teach physics, but to have you take over all the things I usually do."

"This won't do!"

This time, Wen Yu didn't laugh. Instead, she said anxiously, "If you want students to temporarily teach for you, I can manage if I work hard. But if you want students to exercise your authority, I... will find it difficult to convince others!"

That's the truth. Normally, the academy's interests depend entirely on Li Yu negotiating with Li Er. The reason no one dares to cause trouble for the academy is because of Li Yu's status as a prince.

Now that Li Yu is about to leave for Lingnan, if he encounters some minor troubles in the future, he can ask his grandfather for help. But if he encounters major troubles, how can a playboy like him solve them?

As if seeing through Wen Yu's thoughts, Li Yu smiled and said, "You don't need to worry. As I said, there are several senior scholars in charge of the academy, and it's under His Majesty's watchful eye, so you won't encounter much trouble. If you do encounter trouble, go to Changsun Chong and the others. If that doesn't work, you can go to the Crown Prince. With him around, there's nothing that can't be resolved."

As he spoke, Li Yu patted Wen Yu on the shoulder again, then handed him a book, instructing, "This contains all the knowledge I have about physics and mechanical arts. Study it carefully. However, some of this knowledge is beyond human comprehension, so you'd better find evidence before teaching it to others..."

.........