My cultivation disguise has been exposed by Xiao Sizi.

He waved his hand, trying his best to maintain the magnanimity of the monarch of the Celestial Empire.

"You flatter me."

Li Shimin took a deep breath. "The children are just playing together. They speak without thinking. How could I blame the foreign envoy for such a trivial matter? Rise."

Lu Dongzan felt as if he had been granted a pardon, and dared not stay here for even a moment longer.

He hastily wiped the cold sweat from his forehead and took his leave.

"Thank you for your grace, Your Majesty! I will not disturb Your Majesty and the immortal's tranquil cultivation any longer, and will take my leave now!"

Having said that, Lu Dongzan grabbed Sangzha, who was still sobbing, like a chick and rushed out of the backyard of the Prince of Qin's mansion as if his life depended on it.

Until the sound of the two hurried footsteps completely disappeared at the end of the corridor.

The magnanimity on Li Shimin's face vanished instantly.

He turned his head, and his once deep dragon eyes now seemed to be burning with two raging flames as he stared straight at Li Chen, who was lying on the rattan chair trying to suppress his laughter.

"The traitor!"

Li Shimin suddenly stood up, rushed to the rattan chair, pointed at Li Chen's nose, his finger trembling.

"Look at you! What kind of nonsense are you teaching Sizi all day long!"

"A princess born of the royal family of the Great Tang Dynasty, of noble birth! She keeps spouting 'out there' and 'little scoundrel'! She's nothing but a street ruffian! You've completely disgraced the royal family!"

Despite Old Li's furious outburst, Li Chen casually picked at his ear.

Instead of standing up to admit his mistake, he changed to a more comfortable position and crossed his legs.

"Old Deng, you just don't understand."

Li Chen retorted confidently, "I call this cultivating her empress aura from a young age! Didn't you see how arrogant that Tibetan barbarian was just now? Si Zi didn't even lift a finger; she suppressed him with just a few words. That's called subduing the enemy without fighting!"

"An empress's aura?!"

Li Shimin's eyes twitched violently at the word, and he looked around frantically for a stick.

"You call spouting slang 'Empress Aura'? I'm going to teach you a lesson today! I'll show you what true Empress Aura is!"

"Come on, Old Deng, who's afraid of who?"

Li Chen stood up abruptly, glaring at him as he retorted, "Do you think my palm-grip grenade is just for show? If you're not afraid of getting your hair steaming from the shock, then come on!"

The father and son argued back and forth in the yard, their spittle flying everywhere.

Empress Zhangsun stood aside, watching this daily routine unfold, and felt her temples throbbing.

She really didn't want to deal with these two father and son who started fighting every time they met.

Empress Zhangsun sighed and walked over to Xiao Sizi, who was still savoring the "gangster lines" from earlier.

"Sizi, return to the palace with your mother."

Empress Zhangsun took the little maid's soft little hand and turned to walk out of the courtyard gate.

As they walked, Empress Zhangsun whispered her instructions.

"You're not allowed to say those weird things like your sixteenth brother anymore, understand? A girl should be gentle and dignified."

Little Sizi raised her head, her innocent little face filled with confusion.

She scratched her little head and nodded obediently.

"I understand. What Sixteenth Brother said can only be used to deal with those unruly brats outside, not in front of Mother."

Empress Zhangsun stumbled and nearly fell on the flat ground.

She turned back and glared fiercely at Li Chen, who was still arguing with Li Shimin, then quickened her pace, wanting only to get her daughter away from this source of pollution as soon as possible.

yard.

"Come here, Old Deng!"

"I'm furious! Chengqian, let me go, I'm going to fight him to the death!"

"Wan'er, don't stop me. Today I'll teach that old bastard why the flowers are so red and why he disturbs my sweet dreams by waking me up every morning."

......

The argument between Li Shimin and Li Chen continued, so loud that even the sparrows in the trees were startled into flight.

Just then, a series of hurried footsteps suddenly came from the direction of the east wing.

With messy hair and oil stains on his face, Prince Li Tai of Wei rushed into the backyard, clutching a piece of parchment covered with strange symbols.

"Sixteenth brother! Father!"

Li Tai stopped, panting, and raised the parchment in his hand, his eyes gleaming with fanaticism.

"The curved-shaft plow! Your apprentice has finished the blueprints for the improved curved-shaft plow!"

The argument between Li Shimin and Li Chen came to an abrupt halt.

Li Shimin snatched the oil-stained parchment from Li Tai's hand.

He held the blueprints in both hands, his gaze fixed intently on the intricate lines.

"Sixteenth Brother! I've deduced everything from the general outline you gave me before!"

With his messy hair, Li Tai pointed to several key stress points on the parchment, gesturing wildly as he spoke.

"Look at this plowshare. In the past, our Tang Dynasty used straight-shaft plows, which were cumbersome and heavy. When turning, the entire plow had to be lifted up, and it took two strong oxen to pull it."

Li Tai's small eyes shone brightly as he pressed his finger heavily against the curve of the drawing.

"I changed the straight shaft to a curved shaft and shortened the length of the plowshare. I also added a rotating plowshare in front! This changed the point of force application!"

Li Tai spoke faster and faster, waving his hands in the air.

"Sixteenth Brother, your explanation of the principles of mechanics is truly amazing! With just this one modification, the resistance is reduced by at least half! Not to mention two oxen, even an old, weak, or sick ox, or even a slightly stronger farmer, one person could pull it across the field!"

Li Shimin's hands, which were holding the blueprints, began to tremble uncontrollably.

He had conquered the land, served as the Grand General of the Heavenly Strategy, and knew better than anyone where the foundation of this land lay.

Not in the deep palaces of Chang'an, but in the vast, boundless fields.

A single ox can determine the food supply for a family of five for a year. If a farmer could replace an ox in tilling the land, the speed of spring plowing in the Tang Dynasty would increase exponentially!

"Qingque, have you managed to create a physical copy of this?"

Li Shimin raised his head, his voice was a little dry, and even his breathing became heavy.

"Your Majesty, the wooden and cast iron components have all been polished and are ready for assembly. We should be able to test plow them by tomorrow morning at the latest!"

Li Tai patted his dusty chest, his smugness impossible to hide.

Li Chen leaned back in the rattan chair and lazily yawned.

"Alright, stop showing off. Creating something is one thing, but how to use it to undermine the foundations of those old aristocratic families is another."

Li Shimin suddenly turned around, carefully rolled up the blueprint, and stuffed it into his wide sleeve.

"Chen'er is right."

Li Shimin paced back and forth, his brows furrowed tightly.