After discussing the glass issue, Chu Fan had nothing else to discuss with them, so he asked them to leave the imperial study and continue with their own affairs.

In the following days, Chu Fan signed in again and received a system reward that made him very depressed, which was the production drawings of a wired telephone. Although it was the oldest type of telephone, it was already very advanced technology compared to the technological level of the Shengwu Continent.

If the hydroelectric power station is built and then combined with a wired telephone, then even if the territory occupied by the Wei State is remote, it will be possible to quickly convey government orders and information, which will greatly improve the country's administrative efficiency and military response speed.

But the most crucial point now was that he hadn't built a hydroelectric power station yet. Even electrical wires and incandescent lamps hadn't been produced, let alone popularized. Chu Fan could only temporarily put the wired telephone production drawings and the hydroelectric power station construction drawings in the system space to collect dust.

One day, while playing in the Imperial Garden, Tang Ji looked at an eagle circling in the sky and couldn't help but sigh, "How wonderful it would be if we could fly in the sky, overlooking the entire territory of Wei like an eagle. What a magnificent sight it would be."

Chu Fan thought of the martial arts knowledge he had learned and said, "After becoming a martial artist and practicing Qinggong, you can fly over rooftops and walk on walls. I think you should be able to do that with your current strength."

Tang Ji shook her head upon hearing this, then looked at the sky with some melancholy and said, "In fact, no matter whether it is Qinggong or becoming a Grandmaster and being able to stay in the air for a short time, you can never fly freely like an eagle. Qinggong's flying over the eaves and walls looks very noble to ordinary people.

In reality, from the perspective of a martial artist, it's just the same thing: using internal energy to briefly stay in the air, then using the force from objects on the ground to bounce back just before falling, repeating this cycle to move short distances in the air. A master, on the other hand, is simply able to leverage more force while on the ground, then use their agility to perform more complex movements in the air, extending their stay.

If there are no roofs or trees on the ground to help them when they fall, they will have no choice but to land on the ground. So people have never truly conquered the sky and truly soared freely in the sky.

Chu Fan's thoughts drifted back to his time on Blue Star. While the people there lacked powerful military power, they had realized their dream of flying through technology. Airplanes, helicopters, and other aircraft allowed people to freely traverse the sky. They even launched rockets to send people into space to explore the unknown universe.

However, in this world, even steam locomotives are the most advanced means of transportation, not to mention aircraft.

When Chu Fan was thinking, he thought of a flying tool that could be made even in this world, that is: a hot air balloon.

Chu Fan believed the textile mill must have a large stockpile of sheepskin, enough to make hot air balloon bladders. Wei had been purchasing wool and mutton from the Xiongnu during this period. The mutton was used to feed the army and civilians, while the wool was used for textiles. Sheepskin, however, was not very useful; even leather armor was considered unpleasant due to its fishy smell. Furthermore, in the current weather, wearing leather armor made of sheepskin would be even more stuffy and uncomfortable. Therefore, the textile mill must have a supply of sheepskin they could utilize.

Chu Fan said to Tang Ji, "If I can take you up to the sky to overlook Kaifeng City, what benefits can you give me?"

A hint of surprise flashed in Tang Ji's eyes before she laughed, "Your Majesty, are you kidding us? Even a Grandmaster-level expert can't truly fly through the sky and overlook Kaifeng City. How could you, Your Majesty, do it?"

Chu Fan did not directly answer Tang Ji's question, but continued: "You don't need to worry about how I do it, just answer what price you are willing to pay if I do it?"

Liu Ruyan spoke up at this time, "Your Majesty, this is a little unfair. You keep saying that Sister Tang Ji should pay the price, but you haven't said how you will compensate us if Your Majesty fails to lead us to fly into the sky."

Chu Fan was very confident that he could make a hot air balloon, because they were all warriors. Even if the hot air balloon lost control while rising, they could just jump down and land safely with their lightness skills and body movements; so there was not much danger in making a hot air balloon in this world.

Chu Fan said confidently: "If I fail to let Tang Ji overlook Kaifeng City from the sky, then I will grant Tang Ji one wish."

Tang Ji was very moved after hearing this condition. Even though she didn't need anything much in the palace, if she had such a wish, she might be able to save the lives of her family members at a critical moment in the future.

Liu Ruyan continued to fan the flames, "Sister Tang Ji, what are you still hesitating about? Do you really think His Majesty is a god? We have lived with His Majesty for so long, and His Majesty is just an ordinary person, a little smarter than us. Do you really think His Majesty can go to heaven or hell? You don't think His Majesty can do something that even a master can't do, do you?"

Tang Ji had already been persuaded by Liu Ruyan, and blushing, she said, "If Your Majesty can take me up to the sky to overlook Kaifeng City, then after the wedding, I will be at Your Majesty's disposal. I can even invite Sister Mu Xi to come along."

After hearing Tang Ji's words, Mu Xi hurriedly said, "Sister Tang Ji, why did you involve me in your bet with His Majesty? I will not agree to such a ridiculous bet."

Although Tang Ji had been living in the palace with Mu Xi and other women for a while, due to reasons of propriety and integrity, nothing had really happened between Tang Ji and Chu Fan before the official wedding. Although they had a tacit understanding when practicing the Jade Maiden Heart Sutra together, they both kept to the last step and did not overstep the line.

Liu Ruyan whispered in Mu Xi's ear, "Sister Mu Xi, don't you want to fly up into the sky with His Majesty and overlook this magnificent Kaifeng City? You know, this opportunity is rare. If you miss it, there will be no such good thing in the future."

Mu Xi's eyes flickered when he heard this. In fact, even if His Majesty really did take them to the sky, he wouldn't have lost anything. You know, His Majesty often has some strange ideas when he is in the palace, and he didn't think there was anything wrong with it.

Mu Xi couldn't resist Liu Ruyan's instigation and finally agreed to the bet. After all, the temptation of flying into the sky was too hard to resist.