Now I really have to marry the princess.

Yang Zhengdao had no other choice but to use an even more explosive poem to dilute Li Er's attention to that "anti-poem".

He made a quick decision, stood still, cupped his hands, and bowed to Li Lizhi.

"Your subject Yang Zhengdao greets Princess Changle. I was unaware that Your Highness was here. My humble work is truly unworthy of Your Highness's praise, and I am ashamed."

"No need for formalities." Li Lizhi naturally recognized this orphan of the previous dynasty; in fact, Yang Zhengdao was her distant cousin.

But she never liked Yang Zhengdao's awkwardness and feigned modesty. She wrote a good poem, but insisted on calling it a clumsy work.

Thinking of this, Li Lizhi couldn't help but smile mischievously.

"So, it seems my cousin Zhengdao has a masterpiece far superior to this one? Would you be so kind as to let me see it?"

Yang Zhengdao thought to himself that Li Lizhi was indeed a girl at heart, gentle on the outside but unruly on the inside.

Her seemingly difficult words were exactly what Yang Zhengdao wanted to hear.

Yang Zhengdao composed himself and looked at the young girl with deep affection: "I have no masterpieces, but I have met a beautiful woman and my heart is moved, so I must express myself."

After saying this, Yang Zhengdao recited a poem that was also about peach blossoms:

Last year in this door today, the face of peach blossoms in red.

The human face does not know where to go, Peach Blossom still laughs spring breeze.

Yang Zhengdao didn't know if the young girl in front of him could understand the love expressed in the poem, but that wasn't important.

The important thing is that Li Er could tell.

He thought about his eldest daughter, who was only eleven or twelve years old, being coveted by others.

Li Er will surely be furious.

In this way, Li Er would no longer ponder the true intentions behind the poem "It was planted after Yang Lang left".

Just then, Yang Zhengdao received a notification that he had successfully checked in.

[You have successfully checked in at Wannian County, Yongzhou]

[Reward: One random draw]

Black hands, black hands, bad luck go away quickly; red hands, red hands, I have the world at my fingertips.

After reciting the incantation, Yang Zhengdao activated the lottery as soon as his mind stirred.

You have obtained a traditional method for producing penicillin.

All the knowledge, techniques, and procedures related to hand-rubbing penicillin appeared in Li Zhengdao's memory all at once.

This is great!

The boil that Li Yuan contracted was, to put it simply, an infection and inflammation, and penicillin was exactly the right treatment.

Once Li Yuan's carbuncle is cured with penicillin, Yang Zhengdao will have an extra talisman to protect him in Chang'an.

Indeed, when it comes to matters of metaphysics, one still has to rely on metaphysics.

Yang Zhengdao was eager to go back and conduct some experiments, so he bowed deeply and hurriedly took his leave.

Li Lizhi was still savoring the newly recited verses by Yang Zhengdao.

Although she was naive, girls are usually precocious.

Furthermore, given that this was the early Tang Dynasty, a time when early marriage was common, Li Lizhi unconsciously felt ashamed.

Then I thought of the line "Her face and the peach blossoms reflected each other's redness," and I felt my cheeks burning even more.

She only realized what was happening when she heard Yang Zhengdao suddenly leave.

Before she could respond, his tall figure had already disappeared into the peach grove.

"You..." Li Lizhi could only stomp her foot like a fairy, inwardly cursing, "How rude of you!"

……

Just as Yang Zhengdao was attempting to extract penicillin, Li Er in the Ganlu Hall was furious.

"How dare you, you brat!"

Li Shimin slammed his palm on the imperial desk, making the pen holder rattle loudly.

On the emperor's desk were the two poems that Yang Zhengdao had recited at the Xuandu Temple.

"Second Prince, what is the reason for your anger this time!" Empress Zhangsun waved to the kneeling Hundred Cavalry Commander as she entered the hall.

The captain felt as if he had been granted a pardon and bowed as he withdrew.

"Guanyinbi, look! Look at what that remnant of the previous dynasty wrote to Azhi!"

Empress Zhangsun looked at the poem on the imperial desk with surprise and doubt: "Yang Zhengdao?"

Li Er let out a heavy breath and grunted in response.

Empress Zhangsun smiled gently: "Why are you getting angry with a child? A graceful lady is sought after by gentlemen. Isn't it because our Azhi is born beautiful and dignified?"

Li Er snorted coldly, "He's not worthy!"

"Yes, yes, he's not good enough for you!" Empress Zhangsun naturally understood Li Er's feelings about his daughter being coveted, so she went along with his words and comforted him, "Look, he's also self-aware enough to know that he's not good enough for your precious daughter."

Li Er looked at Empress Zhangsun's slender finger and pointed to the line, "The face is gone, I know not where; the peach blossoms still smile in the spring breeze."

The sorrow of wanting something but not being able to have it is vividly portrayed on the page.

Li Er's complexion improved considerably, and when he thought of his daughter, who was growing more and more beautiful, a smug smile appeared on his lips.

"This kid knows what's good for him. But after hiding his true abilities for so long, he's finally given himself away!"

……

Five days later, Yang Zhengdao stood in the courtyard of the residence bestowed by Li Er in Xingdaofang, holding a bowl of turbid liquid in his hand.

The bottom of the bowl was covered with bluish-green mold, and the surface was covered with a layer of grease. This was the penicillin culture solution he had obtained after repeated experiments.

Yang Zhengdao made a total of ten jars of culture medium like this, which was cultivated using rice juice.

Although the method of preparation exists, the actual operation process is extremely complicated.

Especially someone like Yang Zhengdao, who was a college student before time travel whose theory could never be connected with practice.

Thanks to this wicked feudal society, he was able to fully apply theory to guide practice.

The old servant Liu Zhong was originally a former servant of the Sui Dynasty palace. Now his hair and beard are gray and his back is slightly hunched, but he is still quick and agile.

However, he would occasionally display a level of skepticism that was unbecoming of a servant.

"Master, we've come back from buying moldy bread everywhere, and the neighbors are all calling you a scoundrel!"

Yang Zhengdao tolerated it.

"Master, even the dogs won't eat this moldy cake. Is it really safe to use it as medicine?"

Yang Zhengdao held back again.

"Master, perhaps I should inform the old master, just in case..."

Yang Zhengdao could no longer tolerate it. The old master he was referring to was none other than the original owner's grandmother, Empress Xiao.

"Ah Zhong, Grandmother is so old, don't cause her any trouble. I'll have this secret method tested at the Imperial Pharmacy, don't worry!"

The relationship between him and the servant who raised the original owner from childhood was naturally extraordinary.

As for Jiang Cheng and Tan Feng, they both came from humble backgrounds and were adept at guarding the house, running errands, and doing odd jobs.

Ah Wu and Ah Liu were even more obedient and compliant, always following orders.

Yang Zhengdao naturally didn't know that the four men were traitors.

Because even if you know it, it's useless.

After all, when a college student is pretending to be asleep, you can never wake them up.

As long as it's convenient to use, that's fine; there's still a lot of work to be done.

Activated carbon also needs to be produced, and then filtered and purified using activated carbon.

In addition, we need to find people to conduct experiments, otherwise no one would dare to give this drug of unknown origin to the retired emperor.

This requires Li Er's support.

Yang Zhengdao was naturally not qualified to submit a memorial to Emperor Taizong (Li Er). He could only send his petition to the Liangyi Hall through Li Chengqian.

After the original owner returned to Chang'an from the Turks in the fourth year of the Zhenguan era, he studied at the Hongwen Academy with Li Chengqian, so they were naturally acquainted, but they did not interact much on a daily basis.

Li Chengqian was actually a good starting point for gaining Li Er's trust and escaping the cage of Chang'an.

Although Li Chengqian was a deposed crown prince in history, that was merely the result of political struggle.

Throughout, Li Er's feelings for Li Chengqian were sincere and profound.

After Li Chengqian was deposed, Emperor Taizong (Li Er) banished Li Tai from Chang'an, precisely out of a sense of compensation for Li Chengqian.

Like all emperors, Li Er had a strong sense of suspicion, but he was more sentimental than most emperors.

Perhaps killing his brother and forcing his father to abdicate was an indelible regret and stain on Li Er's life.

What you lack, you will care about.

If Li Er could maintain a good relationship with Li Chengqian and, through Li Yuan, keep in touch with distant relatives of the Li family, then Li Er might consider him a nephew rather than a remnant of the previous dynasty.

Of course, confessing his feelings to Li Lizhi at Xuandu Temple by chance was, in retrospect, a brilliant move.

This allows one to create a persona of someone who is uncalculating and acts solely on emotion.

You asked me if I had any ulterior motives?

I'm telling you, because of love.

Yang Zhengdao's guess was absolutely right; Li Er's test had already begun.

An announcement came from outside the compound:

"His Highness the Crown Prince has arrived!"

Yang Zhengdao straightened his robes and quickly went to greet them at the courtyard gate.

Li Chengqian was dressed in casual clothes, with a blue brocade robe draped over his shoulders.

With a handsome face and bright eyes, he was only twelve or thirteen years old, yet he already possessed the elegance and composure of a crown prince.

"Your subject Yang Zhengdao greets Your Highness the Crown Prince." Yang Zhengdao bowed respectfully.

"Cousin, there's no need for such formalities," Li Chengqian said gently, offering a helping hand.

Upon entering the inner courtyard, Li Chengqian's gaze swept over the jars and pots in the yard without making a sound.

"My cousin has been secluded himself to study secret remedies lately, working tirelessly for my grandfather's illness. I have come to visit him."

"Your Highness is too kind." Yang Zhengdao led Li Chengqian into the inner hall. "I just happened to obtain an ancient prescription and wanted to do my filial duty to the Emperor Emeritus."

Ah Wu and Ah Liu began to prepare tea to serve.

Looking at the various condiment bottles and jars piled up on the table, Yang Zhengdao felt a headache coming on.

The tea soup in the Tang Dynasty was like simmering a hot pot broth, with scallions, ginger, garlic, orange peel, mint, and even dogwood added to it.

Yes! You also need to add salt! Can you believe it?

He really wanted to use the system to unlock the tea-frying technique as soon as possible.

Li Chengqian took the teacup and drank it quite readily.

He spoke casually: "Since my cousin returned to Chang'an, he has always been quiet, spending his days reading and practicing calligraphy. I have never heard of him having any knowledge of medicine."

Yang Zhengdao naturally had to fabricate a foolproof plan: "When I was wandering around Xiaohai, I obtained a miscellaneous book from the Later Han Dynasty, which contained this secret recipe."

"Oh? This book?"

"Naturally, it was lost during the battle when the Duke of Dai destroyed Jieli. Therefore, I am not sure if I have forgotten anything in the secret recipe, which is why I asked Your Highness to submit a memorial to the Emperor."

Invoking the ancients is an old Chinese tradition.

You ask? The book is lost!

Even if some new technology is discovered through the system in the future, it can still be used.

That's the wisdom of our ancestors, it has nothing to do with me, Yang Zhengdao.

After hearing this, Li Chengqian didn't know how much he believed, but he showed great regret.

He rubbed his hands together, thinking of what to say.

Yang Zhengdao knew what he wanted to ask, but Li Chengqian was still a bit naive at this time.

As the crown prince, he could have asked directly.

If it were Li Er, he would definitely shout "What are your intentions?" and then wait for Yang Zhengdao to bow his head and explain himself.

Finally, Li Chengqian cleared his throat and asked, "Cousin, please don't be offended, but I'm afraid some people might be suspicious of your enthusiasm this time."

Yang Zhengdao secretly rejoiced; wasn't Li Er the most suspicious person?

Wow, that's brilliant! Is it really okay for you to talk about your father behind his back like that?

Yang Zhengdao's face naturally showed a righteous and awe-inspiring expression: "The innocent are innocent, and the guilty are guilty."

Yang Zhengdao inadvertently uttered a famous line that would become a legend.

But Li Chengqian felt that this distant cousin, who usually kept a low profile, had indeed been hiding his true abilities all along.

"The innocent remain innocent, and the guilty remain guilty. Hmm, that's a novel way of putting it!" Li Chengqian pondered for a moment before revealing a half-smile.

"However, I heard that someone wrote a poem for Lizhi?"

"This..." Yang Zhengdao looked conflicted, his acting skills were impeccable.

After a moment of contemplation, Yang Zhengdao suddenly stood up, bowed deeply to Li Chengqian, and performed a very solemn salute.

After he stood up, his eyes were piercing and his words were earnest.

"Brilliant idea, I want to see Shang Chang Le."