After Zhang Nan changed out of the system a hot air balloon of the same style as Li Er, he began to tinker. Not long after, the airbags on the hot air balloon bulged up, and the air tank that was spraying on the fire also made this sound.

"Okay, Grand Emperor, please come up. This is a hot air balloon. When catching the sword, I carried it to the sky above his camp and threw the sky thunder and it was a pleasure." Zhang Nan said with a smile, as if he was recalling the first foreign arbitrary war in the Tang Dynasty.

When Li Yuan heard that it was already done, he immediately became a little impatient. He stepped on the hot air balloon basket and stood in the basket and said, "Okay, okay, I know you have made great contributions to catching the sword. Come up and take me to heaven quickly. I will also experience the feeling of flying today." Li Yuan was obviously not interested in what Zhang Nan said about "great achievements". After all, it was not Li Yuan who flew over the Turkic camp with the hot air balloon.

Zhang Nan was bored and stopped talking, but said to the two Feng Shui masters who were amazed at the air tank: "Two Taoist masters, come up quickly. With this thing, I believe that you can see the trend of the mountains much more convenient."

After hearing this, Yuan Tiangang and Li Chunfeng also stepped onto the hot air balloon, but their eyes were still on the hot air balloon's air tank. After all, there was nothing that could be burned to be ignited, which made the two people who had already had the knowledge of chemistry very curious.

"Qingquan, what is it in this? Is it oxygen?" Yuan Tiangang asked first.

"In my opinion, it must be hydrogen." Li Chunfeng was not willing to be outdone and showed his chemical knowledge.

"As for this, I don't know, but it's just combustible gases like methane. I don't know very well what it is." Zhang Nan said truthfully. Zhang Nan really doesn't know what gas is inside it, it's enough to burn anyway.

Li Yuan was obviously impatient when he waited, and slapped the side of the hot air balloon basket and said, "I said, Qingquan, can you fly up? Why haven't you moved after a while?"

When Zhang Nan heard Li Yuan's urging, he opened the valve of the air tank, allowing more gas to run out. Slowly, the hot air balloon slowly left the ground.

"Hey, it's flying, it's flying." Li Yuan seemed very excited, like a child. Zhang Nan probably hadn't thought that if it weren't for the hot air balloon basket that was too small, Li Yuan would have wished he would have danced a song in the air now.

Although Li Chunfeng and Yuan Tiangang were flying into the sky for the first time, they were obviously much calmer than Li Yuan. After all, they were here to do the serious business.

Yuan Tiangang looked at the mountains in the distance, and kept turning around with a compass. Li Chunfeng closed his eyes and made gestures. Zhang Nan didn't know what the principle of this closed eyes and made gestures. Anyway, Li Chunfeng looked formal.

Yuan Tiangang did not ask the hot air balloon to float, and Zhang Nan did not open the hot air balloon, but stopped in the air. After a long time, Yuan Tiangang seemed to have finally chosen a position, and Li Chunfeng also opened his eyes at this time.

"Oh? Chunfeng seems to have an idea." Yuan Tiangang looked at Li Chunfeng with a smile.

Li Chunfeng smiled and said, "Don't the master already have the answer?"

"Then Chunfeng, let's talk about the location of the treasure land you calculated." Yuan Tiangang said.

"Oh, Master, please tell me. If I calculated it and saw that what you saw with Master, it would be a shame for me, my apprentice." Li Chunfeng shook his hand with a smile.

"Okay, two Taoist priests, stop playing puzzles, you can just talk about them at the same time." Zhang Nan felt a little unhappy when he saw two guys who knew they were still playing puzzles here.

Now Zhang Nan finally understood the mystery he was playing in front of Li Er, and Li Er felt confused.

"Haha, let's talk about it together." Yuan Tiangang said with a laugh.

"In my opinion, it's better for the master to tell the direction. Let me point out where I counted." Li Chunfeng smiled.

"Okay!" Yuan Tiangang said slowly, "The old Taoist watches the direction of the mountain. This treasure land must be at the sunrise." When Yuan Tiangang just mentioned the word "sun", Li Chunfeng's hand had already raised up and pointed to the east.

When Zhang Nan saw that the two of them were in such a pace, he suspected that they had agreed on it, but Zhang Nan didn't know whether it was Feng Shui. Even if the two agreed on it, Zhang Nan didn't know.

"Qingquan, you can fly eastward with this object now. The treasure land must be in that direction." Yuan Tiangang gave a very general statement. Anyway, if you can't find it, Zhang Nan was unsure. Of course, if these two people were just a Feng Shui treasure land, then Li Yuan would definitely put the academy somewhere.

"Okay, let's go." Zhang Nan said, then flew eastward with a hot air balloon.

While flying, Zhang Nan said, "I'm talking to the two Taoist priests. Although we want to find a Feng Shui treasure land, it's almost enough. After all, the students are here to go to school. We built this academy into the deep mountains and forests. It's not convenient to go out to buy vegetables, let alone go back to Chang'an City."

In fact, what Zhang Nan said is not without reason. After all, it is now the Tang Dynasty. There is no winding mountain road on the Qinling Mountains like in later generations, nor is there any wild animals that have been driven to unknown places. The Qinling Mountains are now a real primeval forest, and the animals inside can eat people.

"Well, I know, Qingquan is just flying, it will definitely not be too far away." Yuan Tiangang nodded and signaled that he knew.

Sure enough, within a while, Yuan Tiangang patted Zhang Nan's shoulder and said, "Stop quickly, stop quickly, it's here. The old Taoist temple is surrounded by purple air, which is definitely a treasure land."

When I heard that there was purple air surrounding me, let alone Zhang Nan, even Li Yuan looked down with his neck.

"Am I blind? Why can't I see the purple air?" After Zhang Nan looked at the forest below, it seemed that there was no difference from other places.

"It must be here. Qingquan, please find a place to settle down." Yuan Tiangang said.

Zhang Nan had no choice but to find a small open space and stop the hot air balloon. After stopping the hot air balloon, Yuan Tiangang and Li Chunfeng did not say much, but walked forward with the compass, as if they were to find the so-called "purple air surrounding" place.

Within two minutes of walking, Yuan Tiangang stopped, put away his compass, looked at the small open space in front of him and said, "It's this place. This place is definitely a Feng Shui treasure land. It's better to build a college here."
Chapter completed!