"Because when the teacher picked you up, there were exactly six kinds of poisons around you, so the teacher named you Guo Liuzhuo."

Guo Liuyu frowned and nodded slowly.

Because of the six poisons.

So I call myself Guo Liuzhu.

Am I grass?

What's that?

"Do you know why the teacher sealed all your memories?"

"Hmm... What? ”

Guo Liuyu looked at the people of the Holy Arra Dao with a question mark on his face.

"Because it's for your own good to be a teacher."

The Shinra Daoist in front of him suddenly stopped, and he stomped lightly with his arm behind his back.

What appeared in front of them was a mountain.

"This is the HRE Sect."

Looking at the dense jungle in front of you, you can hear the howler bird from time to time.

Guo Liuyu felt a very familiar feeling.

He even knew that on the other side of the mountain there was a river whose source he didn't know where it was.

Next to the river is a path for up to two people walking side by side, leading from the base of the mountain to the hut at the top of the mountain.

The Shinra Daoist in the air stretched out his arms.

A very oppressive aura emanated from him.

Subsequently, the eighty-one peaks that he had just reluctantly taken over connected to each other and scattered around the Shinra Sect.

"Wind."

The Shinra Daoist snorted softly, and a gust of spring breeze blew through.

There are countless green grasses visible to the naked eye on those eighty-one peaks.

"Rain."

A drizzle of life fell from the sky.

After the small but gentle raindrops fell, the trees and flowers grew rapidly.

The originally bare hill became vibrant in an instant.

"Go and pick one you like with your little sister."

The Shinra Dao people who did all this didn't seem to have consumed a little physical strength.

He didn't say anything, and after a few breaths of walking through the void, he reappeared next to the small house on the top of the Shinra Daoist Mountain.

"By the way, Liuzhu, now teach your junior sister."

The people of Shenluo Dao sent a message to Guo Liuzhu.

"Xiaoyu, you can pick one first."

Receiving the task given to him by the people of the Shenluo Dao, Guo Liuzhu felt a lot of pressure.

"Well, there's a lake, and I like water."

Yu Xiaoxiu lay on the clouds, looked carefully for a long time, and then pointed to the mountain peak with the Shenluo Sect as the origin.

That's right.

Guo Liuzhu, who was in the air from God's point of view, suddenly found that these mountain peaks were arranged very distinctively.

The HRE sect is in the very center.

And the peaks that have just been scattered are lined up by the city, which is very interesting to watch.

"Okay."

Guo Liuyu controlled the clouds and landed on the top of this mountain.

Indeed, there is a small lake just below the summit.

The water is crystal clear, with a light blue that is close to transparent on the top and a deep blue in the depths.

"This peak will be called Yufeng from now on."

Yu Xiaoxiu said excitedly.

Guo Liuju hesitated for a moment and only sighed slightly.

This junior sister of mine is worthy of being a terrifying existence with extraordinary talents.

In just two sentences, I learned the strange way of naming the Shinra Dao people.

"Senior brother, I'm a mortal now, don't I need at least Jin Dan to go out to play, otherwise I will embarrass the master?"

"Not really."

Guo Liuyu felt a heartache inexplicably.

"The identity of a mortal is not ashamed at all."

He sat on a stone by the river, not noticing that there was a small trumpet flower behind him.

"But I see that the disciples of the other sects are all immortals."

Yu Xiaoxiu sat next to Guo Liuyu, although she was fourteen years old, she looked even younger.

"Xiao Yu, Senior Brother will teach you the first mathematical knowledge now."

Guo Liuyu smiled slightly.

Then, with great effort, it took him ten minutes to break a branch from the immortal tree next to him with his mortal body.

"Look, it's a line."

On the moist land by the river, he drew a vertical line.

Before the crossing, Guo Liuzhu was reviewing the question type of linear programming.

He found that in a planar Cartesian coordinate system, the Y axis is the boundary.

When a straight line that crosses the origin approaches the Y-axis infinitely from the right side but does not coincide with the Y-axis, its slope tends to be positive infinity.

Similarly:

When a straight line that crosses the origin approaches the Y-axis infinitely from the left side but does not coincide with the Y-axis, its slope tends to be negatively infinite.

That is, these two seem to be absolutely two extreme things, and there is only a thin Y-axis between them.

"Immortals and mortals are the same, these two things seem to be extreme, and the distance between them is just a layer of 'Y-axis' thinner than paper."

"Between immortals, there is only a thin line of separation."

After more than two hours of speaking, the ground was already full of various numbers and letters.

To Guo Liuzhu's surprise, Yu Xiaoxiu's eyes were always serious.

He didn't plan to let Yu Xiaoxiu understand all of them.

This is high school knowledge after all.

For the little ones, just add something esoteric to the conclusion and they will only remember the conclusion.

But Yu Xiaoxiu's seriousness made Guo Liuyu can't help but talk more and more.

From what is positive and negative to what is the number line to what is slope.

"So it's actually very easy to break through between immortals and mortals, and even mortals can kill immortals?"

Yu Xiaoxiu's eyes were starry.

"Hmm... Almost..."

What Guo Liumu wants to say is actually that there is no world of difference between knowledge immortals and mortals.

Immortals and mortals are like the same, they all belong to infinity, there is no distinction between high and low, and the distance is not far away, and even infinitely close.

"Wow!"

"Senior brother, you are so amazing."

Yu Xiaoxiu took a deep breath in shock.

She must have felt incredible now, but full of power.

The power of mathematics.

"Senior brother, do you know who was the first person to discover the secret of immortals and mortals?"

Of course, it's your brother and me.

"Is it Gauss, the mathematician?"

"Gauss Immortal, he's really powerful......"

Yu Xiaoxiu clenched her fists and pursed her mouth.

It is not difficult to see that she has made Riemann her idol and goal.

"By the way, Xiaoyu, I'm also a mortal now."

Guo Liuyu smiled slightly.

......

In a very distant place, four old men of the Immortal Wind Dao bones were gathered together.

Each of them pinched a pink morning glory.

Although the picture was very inconsistent, all the words that Guo Liuyu just said were clearly heard by them.

"The old man who Guo Liuyu just said couldn't understand a word."

"He just seemed to say... He.. What did he say? ”

"He said he was mortal too"

"And mortals can slaughter immortals"

The elders of the four immortal sects looked at each other.

"Do you know the Gauss Immortals?"

"Unheard ......"

"Someone who can tell that there is only a thin line between immortals... Perhaps, maybe it can only be the first generation of immortals in the period of immortal and demon melee. ”

"Not good!"

The contemplative Sword God Sect Elder's face suddenly changed.

The two ancient coins hanging from his waist shattered in half without warning.

"The Man I Sent"

He held the four halves of the ancient money with a gloomy face.

"What realm are they?"

"Merge Realm."

The other three elders looked at each other for a moment, and they all saw a hint of jealousy in each other's eyes.

and fear in the deepest part of the pupil.

The Merge Realm is only a terrifying existence one level lower than the Tribulation Realm.

Mortals can slaughter immortals!!

This man's strength is terrifying.

It seems to be true.

"Pass the order, and when you see Guo Liuzhu and Yu Xiaoxiu in the future, you must be entertained well, and you must not be neglected in the slightest."

The elders of the four immortals spoke to their sect almost at the same time.

"But there is no fish show.... How do we explain to the Demon Sect? ”

"If we have the skill of slaughtering immortals, why should we obey the words of that demon gate?"

"As long as you hand over Yu Xiaoxiu to the Demon Gate before the Xianmen Dabi in a hundred years."

"It's not a problem for the Shenluo Dao people anymore, as long as you keep an eye on that Guo Liuzhu, don't worry about Yu Xiaoxiu not taking the bait...

"Hey, hey, hey.."

The old men nodded silently.

Their goal seems to have shifted from Yu Xiaoxiu to Guo Liuzhu

"Then senior brother, immortals and mortals are two extremes, are demons and humans also two extremes?"

Yu Xiaoxiu looked at the graphics on the ground and said suddenly.

"Hmm... Sort of..."

Guo Liumu nodded slowly.

A leaf on the tree he had just broken off had drifted down in the wind, just obscuring the tiny trumpet flower behind him.

"So there is only a thin line between humans and demons?"

Yu Xiaoxiu looked at Guo Liuzhu with some nervousness and expectation.

Through her eyes, Guo Liuyu judged that she wanted to get an affirmative answer.

"Yes."

"Whew..."

Yu Xiaoxiu breathed a sigh of relief.

"Then Senior Brother won't dislike me as a demon clan, right?"

"No, it won't."

Guo Liuyu scratched his head.

"Huh?"

"What?"

"Demon?"

Guo Liuyu, who reacted to what Yu Xiaoxiu had just said, stood up suddenly.

Although his memory was sealed by the Shinra Daoren, this did not affect his worldview.

There are only 10 races in this world.

Humans, demons, and races that don't understand the ternary system.

The human race and the demon race are in absolute opposition, although there are still two opposing sides in the human race: the Immortal Sect and the Demon Sect.

Looking at Yu Xiaoxiu, who was sitting on this not big stone at all, and his feet could still swing in the air, Guo Liuyu silently recited a wave of ninety-nine multiplication formulas to calm himself down.

Indeed, even if a fourteen-year-old human child is stunted, it can't be so young!!

But if it's a demon clan, it's normal.

"Six animals, don't scare your junior sister with such a fuss...."

"Okay master."

"Huh? Master? ”

Guo Liuyu turned his head and saw the Shinra Daoist standing behind him with a calm face.

"Master, you.... When did it come? ”

"I've always been there."

The Shinra Daoist pointed behind him.

"You just pulled a hair from my head."

Guo Liuyu squinted his eyes and looked around and saw that the tree he had just broken off the branch was gone.

Damn, he should have thought of it a long time ago.

With their own strength, how can it be ....

Break off the new branches of that tree?

"Senior brother, didn't you just say that there is only a thin line between demons and humans?"

Seeing Guo Liuzhu's fierce reaction, Yu Xiaoxiu was obviously a little disappointed.

Yes, there is a thin line.

But there must be a thin line!

And this line ......

It is insurmountable.

"I can take it, but Master."

Guo Liuju looked at the Shinra Daoren.

His mind is inherently open-minded, and humans and demons are just different races.

The reason why he was so excited just now was completely an instinctive reaction of this body.

"Of course, being a teacher can also accept it, after all, being a teacher is also a member of the demon clan camp now."

"That's good!"

Guo Liuyu breathed a sigh of relief.

"Wait a minute, what's that?"

"I'm grass!"

I'm also a member of the demon clan now.

What does this mean?

"Six beasts, what do you think of the four great immortal sects at the Immortal Ascension Conference just now?"