Although the key had not yet been discovered, the current situation was enough to show that something had obviously gone wrong in the process of Cheng Yang's potion making.

An Yan knew that the situation would not change even if Cheng Yang continued trying. He patted Cheng Yang's shoulder and said, "Don’t worry, we can take our time to figure it out. It's been a hard day for you. Let's first get some rest. "

Cheng Yang was frustrated. He had only gained huge benefits from his best friend, but had not been able to help in any way.

He wanted to try a few more times, but he knew that it would be useless no matter how hard he tried now. He could only barely pull himself together and say, "Okay, I'll be in my room first. Just call me when you need me to come over. "

An Yan handed a packed bag of potions to Cheng Yang, and emphasized, "The red one is for turning into animal form, and the white one is for regaining human form. Don't drink the wrong one."

"I'll be off then." Cheng Yang nodded repeatedly and turned to leave with his bag of potions.

An Yan frowned slightly after he left, "I feel as if the problem lies with me, but I don't know what the problem is."

Cheng Yi pondered for a moment and suggested, "It’s hard to come to a conclusion with just Cheng Yang. We can ask for Grandpa’s help if you don’t mind. "

Speaking of which, Grandfather Cheng already knew about the transformation potion.

An Yan's eyes lit up as he asked, "Does Grandpa Cheng know how to make potions too?"

Cheng Yi said, "He knows the basics, but the production process of the transformation potion is a little different from other potions. It is important to understand and learn first. "

An Yan was about to nod, but then he hesitated: "Wouldn’t I be bothering Grandpa Cheng if I asked him to help with this?"

"Yan Yan is too worried. You saved Grandpa's life and helped him so much. How can such a small favour be considered a bother? " Cheng Yi smiled lightly and comforted him, "Besides, although this favor is small, the contribution will be very great if we are able to reach a definite conclusion. Grandpa will be happy to help. "

An Yan made up his mind at those words, "Then let's go find Grandpa Cheng."

Grandpa Cheng had been cultivating at home all this time. His physical and mental condition had improved greatly from before, and he would learn about the outside situation through his light brain during his free times.

He was using his light brain to contact one of his former subordinates when An Yan and Cheng Yi knocked on his door.

Grandpa Cheng asked, "Who is it?"

An Yan's voice came in, "Grandpa Cheng, it's me."

Grandpa Cheng turned off his light brain and softened his tone, "Come in, Yan Yan."

An Yan had seen Grandpa Cheng quite a few times when he visited the Cheng family home before, but he had gone a long time without seeing him recently. He now saw some obvious changes in Grandpa Cheng after a few days of not seeing him.

In fact, he would notice this almost every time he saw Grandpa Cheng.

He still remembered the first time he had seen Grandpa Cheng; his head was full of silver hair, the heavy wrinkles on his face, and the dull yellow skin with a distinctly sickly look.

At that time, Grandpa Cheng was lying quietly on a hospital bed. His whole body looked lifeless. It was as if even his breath carried a cold and dull aura.

When he began to cultivate, his physical condition improved by leaps and bounds, and in just a few days, his face was much better. Even if he was still looking sick, at least his vitality had been rejuvenated.

The head of silver hair had all turned back to a light glossy black, the wrinkles on his face had faded to almost invisible, and his skin was glowing with a healthy redness again. It would not be an exaggeration to say he looked a hundred years younger.

An Yan's mouth was particularly sweet when he entered the room; "Grandpa Cheng looks much better than before."

Grandpa Cheng smiled and said, "Thanks to Yan Yan's blessing, my health has improved greatly."

An Yan didn't hide anything, so he immediately made his request, " I want to ask Grandpa Cheng to help me make a few transformation potions to see if they will have any effect."

Grandpa Cheng naturally agreed straight away, "Okay, then let's go straight to the pharmacy room."

The three of them arrived at the pharmacy room, and An Yan first explained the steps of making a transformation potion in detail. He went ahead to carefully demonstrate them, and then it was Grandpa Cheng's turn to do it.

Compared to Cheng Yang, who often made potions, Grandpa Cheng's movements were much slower, and there was even a bit of fumbling. He even had problems with the steps on his first two attempts.

But Grandpa Cheng's movements seemed much more proficient by the third attempt, and he managed to make a potion without any problems.

However, the problem was that An Yan still had no reaction after drinking the potion.

An Yan didn't say anything about this. He instead bothered Grandpa Cheng to make two more potions, but the results still didn't change.

He knew that even if they continued, it would probably still be useless. An Yan had to tell Grandpa Cheng about the problem and confusion he had encountered, "I thought that since Cheng Yi could make the Transformation Potion without any problems, others should be able to as well, but the current situation is a bit different from what I expected."

An Yan would not be anxious if the transformation potions made by Cheng Yang and Grandpa Cheng could even work a little. Because as long as the potion could work, it meant that his previous guess was right.  As long as one practices more, the potions made will always meet the requirements for transformation.

But the problem is that all the potions the two had produced did not work, which made An Yan start to doubt his previous speculations.

Grandpa Cheng pondered for a moment and made a guess, "Since only Ah Yi could make transformation potions, then the key lies in him. We can consider the differences between Ah Yi, Yang Yang, and me. Such as his spiritual power level, strength, or the animal traits he carries? "

An Yan went along with Grandpa Cheng's thoughts and began to seriously analyse, "It shouldn't have anything to do with strength, Cheng Yi also failed the first time he made the transformation potion and it took many attempts before he was successfull. The animal traits should also have nothing to do with it. The animal traits I carry are those of a hamster, while Cheng Yi's are those of a white tiger, yet the transformation potions we both made were successful. Could it really be related to the spiritual power level? "

Cheng Yi's spiritual power level was SS level, and An Yan's was not that high if it was according to the original owner. But now that An Yan's spiritual energy had been integrated into the original owner’s spiritual domain, his spiritual power level had naturally changed drastically.

If it really had to do with the spiritual power level, then what kind of level did one have to reach in order to successfully create a transformation potion?

Just as An Yan was thinking deeper in this direction, Cheng Yi suddenly spoke up, "It should have nothing to do with the spiritual power level."

An Yan's thoughts were interrupted and he couldn't help but look at Cheng Yi, "Why does senior say that?"

"Making a transformation potion doesn't require a lot of spiritual power. Unless the spiritual power level is too low, it won't affect the production process. " Cheng Yi stated his thoughts.

Cheng Yi must be quite certain for him to say this, and An Yan also felt that it made sense. But aside from that, what could it be that led to this result?

Just as An Yan was frowning and looking down in contemplation, Cheng Yi gave him a glance, as if he wanted to say something, but was hesitating.

But after this hesitation, Cheng Yi still took the initiative to speak, "I have a guess."

An Yan immediately raised his head, "What kind of guess?"

"If we are just looking for differences, my spiritual power is indeed a little different from grandpa and Yang Yang," Cheng Yi glanced at his grandfather, and after a pause, he said to An Yan, "Our spiritual powers once fused together."

Since they had cultivated together, they had circled each other’s spiritual power through their bodies, and it was only natural that their spiritual powers should be mixed together.

The simple An Yan did not think much about it, instead his eyes lit up and he said, "That's true! So that's where the problem lies? "

Grandpa Cheng didn't think much about it either, mainly because he didn't have a direction to take in his thought process for the time being. He just pondered, "Spiritual power fusing together? What's going on here? "

An Yan was just about to explain, but Cheng Yi grabbed him first, "Grandpa, Yan Yan and I are lovers, and there will always be some intimate contact."

An Yan blinked, a bewildered expression on his face. Wasn't it just helping each other cultivate? What did this have to do with being lovers? And was that considered a kind of intimate contact?

Isn't it intimate contact whenever Cheng Yi pestered him....An Yan couldn't help but blush as he thought of certain harmonious images, and his thoughts went a little off track, forgetting to ask the question that had come to his lips.

Grandpa Cheng’s eyes flashed at Cheng Yi’s hint. He saw An Yan blushing, and he had to say, "You young people don’t have to say such things in front of this old man. Just make sure you stay on track now that you have found the right direction. I'm tired and want to rest. "

With that, Grandpa Cheng waved his hand with a disgusted look. He really didn't want to see these two continue to show their love in front of him. That was too toothsome.

Cheng Yi did not feel that there was anything wrong with his words, much less knew what humility was. He directly reached out to wrap his arm around An Yan's shoulders and said to Grandpa Cheng, "Thank you, grandpa. Then we’ll be going back to our room first."