"Yuanyuan, how was this castle-like house built?!" Pei Jiao couldn't help it. She reached out and touched the wall of the fortress. The moment she touched it, she felt a delicate chill.

Pei Jiao walked back and forth, touching the wall of the fortress. She was pleasantly surprised to find that the wall not only felt finer than the city wall, but was also more solid in texture.

Such fortifications will be more effective in border defense!

"This wall is made of cement. If you want the formula, you can go directly to Ningning or Xiaoan. They both have the formula." Xu Yuan stood at the gate of the fortress waiting for Pei Jiao. The others had already entered the fortress and were talking in the yard.

"Where's Sister Pei?" Xu Ning was so busy being intimate with Old Lady Xu that she forgot about the people she brought with her. She looked around and found that only Pei Jiao had not come in.

Whoever was said to be here arrived. Pei Jiao appeared at the entrance of the fortress and walked in in the blink of an eye.

She had an excited smile on her face, and you could feel how excited she was before you even got close to her!

"Ningning! Your castle design is amazing. Can I exchange the cement method for what you want?" Pei Jiao thought about it, but couldn't think of what Xu Ning liked about her.

"Okay! Just exchange it for money. How about 10,000 taels and I'll sell you the recipe?"

"Really?" Pei Jiao grabbed Xu Ning's hand, unable to believe that Xu Ning was willing to give her the cement recipe for just 12,000 taels.

"That's right. This cement can be used to build walls, floors, bridges, and houses. You won't be cheated or outbid for ten thousand taels!"

"I think this is too cheap!"

"It's not a big deal, I won't suffer any loss! Hehe." The main reason was that Xu Ning originally wanted to popularize this recipe.

Giving this recipe to Pei Jiao also meant giving it to Jiang Yan. Jiang Yan had already generously given her two cities, so it was understandable that she was giving him a discount by selling him a recipe.

"Ningning, you are so kind! I thank you on behalf of the soldiers!" Pei Jiao's excitement turned into touching. With this more solid fortification, the soldiers can reduce more casualties.

"Okay, okay, Sister Pei, you're on vacation, don't overthink it. Little girl, go and persuade your master!"

"Hahaha"

Pei Jiao smiled and wiped away the tears from the corners of her eyes. The enthusiasm of the Xu family made her forget all the sadness.

"Where are the people? Where did Qi Canglan go again?!" Beads of sweat rolled down Qi Songbo's forehead. He wiped the sweat with his hands and looked around anxiously.

They had originally agreed to wait for Xu Ning to leave and leave together, but who could have imagined that at the critical moment, Qi Canglan suddenly had a stomachache. This delayed them for a full quarter of an hour, and by the time they hurried out of the city gate, Xu Ning and the others were nowhere to be seen.

The two Qi masters were in a state of panic! After all, they had never been to the valley where the Xu family lived. Now that they had rashly entered this mountain forest, they were completely clueless and at a loss as to what to do.

"Master, this Young Master Qi was clearly here just now." The servants around Qi Songbo also looked everywhere and said while shaking their heads helplessly.

It was strange to say, but Qi Canglan had completely changed since entering the mountain, disappearing from time to time. At first, everyone was panicking, but after seeing him more and more times, they gradually calmed down.

Indeed, despite the numerous difficulties along the way, they were fortunately able to follow some clues and catch up. Unfortunately, Qi Canglan was born with a poor sense of direction and would go the wrong way three or four times almost every day.

"Hurry up and split up to look for it!" Qi Songbo was exhausted and panting. He finally found a big rock and wanted to sit down and rest for a while. But as soon as his butt touched it, he felt a burning sensation and jumped up with a cry of pain.

"Master, have you forgotten again? You can't sit on these sun-baked stones casually. They are too hot!" The servant beside him quickly reminded him.

"Oh, I get it! Stop talking nonsense, it's important to find someone quickly!" Qi Songbo was angry and anxious. He waved his hands and urged his servants to speed up and find Qi Canglan. He didn't want to stay in the wilderness for a moment.

In the valley crack a few hundred meters away, Qi Canglan supported the rock walls on both sides with his hands and feet. He looked up at the light above his head and found that he was too far away from the ground. The tree at the entrance of the cave looked about the size of a palm.

"Hello! Is there anyone here? Help!"