Transmigrated into Li Chengqian, he effortlessly ascended the throne and became emperor.

"Come, grind the ink." Li Shimin was in a good mood and sat back down at his desk. This time, his expression was no longer one of simple instruction, but rather one of testing and expectation. "I will write a secret edict for Chai Shao right now. Since you came up with the idea of ​​using wool, then tell me, how should we calculate the losses in the transportation of military rations?"

Li Chengqian obediently picked up the ink stick and slowly ground it in the inkstone, while casually looking at the grain and fodder data listed by Li Shimin.

"Darling, this algorithm is too slow."

While Li Shimin was still fiddling with the abacus, Li Chengqian had already taken a charcoal pencil and written down several strange vertical calculations on a piece of paper.

"Look, as long as we break these large numbers down, combining the whole numbers and the zeros... the loss here is 13%, the distance over there is 500 li longer, and when you calculate it..."

The little hand quickly traced the name on the paper, while the little hand muttered to itself.

In just a short while.

"I've figured it out! If we transport the grain by water, although it's slower, we can save three thousand shi of grain!"

Li Shimin hadn't even finished turning half of the beads on his abacus.

He stared in astonishment at the scribbles on the paper, then looked at the half of his calculations, and silently deduced in his mind that it was... exactly the same!

"Did you come up with this yourself?" Li Shimin's voice trembled slightly.

"Not entirely," Li Chengqian scratched his head, revealing a row of small white teeth, his smile as bright as the winter sun. "Last time we were looking at houses, the uncle was doing the calculations, and I saw he was getting really tired from using the abacus. I was thinking about whether there was a way to be lazy. I remembered what my father taught me: governing a large country is like cooking a small fish—you have to simplify complex things. So, can arithmetic also be simplified?"

It's "My father taught me" again.

These flattering remarks made Li Shimin feel extremely comfortable, even his pores seemed to open up.

No wonder he is my son!

What do those pedantic old Confucian scholars know? They only teach children to read books to death, thus extinguishing their natural talents.

See? I taught him so well!

Under my tutelage, Chengqian not only became well-versed in military strategy but also proficient in mathematics, and even had unique insights into governing the country.

At this moment, Li Shimin firmly believed that he was not only an emperor of all time, but also the greatest teacher of all time!

Li Shimin excitedly grabbed the paper covered with strange symbols, as if it were a treasure. "This method is brilliant! When Xuanling arrives later, I will show him that his decades of mathematical skills are not even as good as my eight-year-old son!"

Seeing Li Shimin's eagerness to boast to the world, Li Chengqian silently lit a candle for Fang Xuanling in his heart.

Mr. Fang, I'm sorry, but for the sake of my survival, I have no choice but to compromise on your plans.

In the days that followed, the Liangyi Hall became the stage for this father and son to showcase their talents.

Li Chengqian was watching as Li Shimin reviewed the memorials.

At first, he would just look at them, but later Li Shimin would deliberately pick out some less important memorials and throw them to his son, saying, "Yu Nu, you review them."

Li Chengqian was certainly not foolish enough to actually offer advice on governing the country; that would be a death sentence.

He would first imitate Li Shimin's handwriting each time. Although it was still immature, it already had some charm. Then he would write down his opinions in the simplest and most straightforward language.

For example, an official might submit a memorial reporting auspicious omens in a certain place and request a reward.

Li Chengqian commented: "Father said that the greatest auspicious sign is that the people are well-fed. This five-legged ox only proves that it is deformed, so I will not reward it."

After reading it, Li Shimin laughed so hard he almost fell over. While cursing the "mischievous devil," he didn't hesitate to draw a big "OK" next to the line of text.

For example, an imperial censor impeached a general for drinking at the border and causing trouble.

Li Chengqian commented: "If drinking can lead to victory, Father will send wine too. But if it causes trouble, Father's blade will be sharper than anyone else's. Let the Ministry of War investigate whether he has caused trouble, instead of just focusing on his wine cup."

Although his language was rough, his logic was crystal clear—he valued practical achievements over personal morality, which was precisely Li Shimin's approach to personnel management in the early days.

Whenever Li Shimin saw these annotations, he felt as if he had drunk a pot of fine aged wine, which intoxicated him to the core.

This child, how come he looks so much like me?

This cleverness, this seemingly mischievous yet insightful wit, is practically a carbon copy of my younger self!

A tremendous sense of accomplishment enveloped Li Shimin, and he even began to look forward to his daily teaching time.

Because in this process, he is not only cultivating a successor, but also having a dialogue with a soul that can understand him, admire him, and even occasionally surprise him.

Through this daily "teaching by example," Li Chengqian's image as Li Shimin's most perfect student gradually took root in people's hearts.

At dusk that day, the snow finally stopped.

The afterglow of the setting sun shone on the golden tiles of the Taiji Hall, reflecting a dazzling light.

After finishing the last stack of memorials, Li Shimin stretched and turned to look at his side.

Li Chengqian was so exhausted that he fell asleep on the table.

Her small body was curled up in a ball, her hand still tightly clutching the vermilion pen, and a red ink stain was smeared on her fair cheek, making her look both comical and adorable.

Li Shimin's heart melted instantly.

He tiptoed over, took off his bright yellow fur coat, and carefully covered his son with it.

"Your Majesty, shall we wake His Highness and bring him back to the Eastern Palace?" Wang De asked in a low voice.

"No need."

Li Shimin waved his hand, "The Crown Prince has been exhausted these past few days. What I've taught him these past few days is something even an adult prince might not be able to digest. It's remarkable that he's kept up so closely."

As he spoke, Li Shimin gently bent down and used his rough fingertips to wipe the ink off Li Chengqian's face.

As if sensing something in his sleep, Li Chengqian unconsciously rubbed against Li Shimin's large hand, muttering, "Father... the best..."

Li Shimin's fingers stiffened, and then his eyes welled up with tears.

"Silly boy."

Li Shimin chuckled softly, bent down, and picked up the heavy little dumpling with steady and powerful movements.

"Wang De, prepare the carriage for the Lizheng Hall. Tonight, the Crown Prince and I will dine at the Empress's residence. Tell Guanyinbi to prepare the monkey's favorite cheese cherry."

"And another thing," Li Shimin said, walking out with a brisk pace, as if recalling something to boast about, "have Fang Xuanling, Du Ruhui, and Changsun Wuji come early tomorrow. I have a draft of a policy essay written by Chengqian on the *Zhenguan Zhengyao* (Essentials of Governance in the Zhenguan Era), and I want them to have a good look at it!"

Wang De watched Li Shimin's light and carefree figure as if he had just found a treasure, and couldn't help but secretly click his tongue in amazement.

My dearest Majesty, do you love him that much?