Time goes back to when dozens of portals to new worlds were just opened.

As the strongest time traveler among the lone wolves, Li Yun naturally chose to enter a high-energy world alone.

It is said to be a high-energy world, but in fact it is just a high-energy world among this batch of new worlds.

After all, the power in the heavens and all worlds is complex. If you look into it carefully, it can be divided into dozens of levels.

Therefore, the Void simply divided these dozens of new worlds into three levels: low, medium, and high. Among them, the highest energy level world, the recommended level is only the True Immortal level above the ninth level.

The world that Li Yun chose to enter was not the strongest one, but a new world with a recommended level of only eight.

After entering the world, Li Yun discovered that this was a Western fantasy world similar to "Dragon Quest". There were heroes and demons in the world, as well as a so-called goddess who would summon heroes from another world.

Relying on his strength comparable to that of a true immortal, Li Yun can be said to be able to cover the sky with one hand in this world.

He first slapped the king and the hero in the kingdom that summoned the hero, and then traveled north, collecting the magical knowledge and special powers of this world while moving towards the devil's lair.

During this period, all the demon armies were easily destroyed by Li Yun.

He also easily killed the corrupt human noble lords, and gave the civilians power and awakening consciousness, allowing them to rise up in resistance.

Not long after, Li Yun arrived at the Demon King's City, and with his completely overwhelming strength, he razed the entire Demon King's City to the ground with a wave of his hand.

The so-called devil king who was said to have the power to destroy the world died without even seeing him.

Li Yun didn't care about the so-called Demon King and the demons at all. He took away all the treasures collected by the Demon King and prepared to leave.

But when he returned to the human kingdom in the south, the whole world suddenly changed.

The original human kingdom changed its name, and the king and noble lords became another person.

Not only that, all traces of his previous journey north were completely wiped out by some strange force.

It was as if he had never come into this world and had never left the slightest trace in this world.

After discovering this, Li Yun realized that something was wrong.

He returned to the kingdom's capital and once again witnessed the king summoning heroes.

But this time, both the summoned hero and the king who had turned into another person showed expressions of extreme shock and fear after seeing his appearance.

They called Li Yun the Demon King, and rushed forward recklessly, trying to kill the Demon King who appeared in the royal capital.

Li Yun was a little puzzled, but faced with those real murderous intentions, he still acted decisively and eliminated everyone.

Just after he defeated the unfortunate hero, the world changed dramatically again.

The royal city that was razed to the ground by the battle was restored to its original state in the blink of an eye, and the king and the army he killed also came back to life.

And just like the previous experiences, all the people who were resurrected looked different, with different names and experiences.

At this point, the uneasy feeling in Li Yun's heart had turned into a bit of horror.

He realized that the problem might be with this world, or with the goddess who only existed in everyone's faith.

Considering that killing the king and the brave man might cause the world to go backwards, Li Yun did not kill them this time.

He simply defeated the king and the third brave warrior who was summoned, and then left the royal city directly, trying to find the mysterious goddess and explore the truth of this world.

But not long after he left the royal city, the world returned to its original state.

And what was different from before was that this time, he actually followed the world back to the palace.

Now Li Yun felt even more terrified.

He hesitated whether to report the matter to the Alliance, but after a little thought, he decided to explore this world by himself. The Alliance only passed on some intelligence about the world and did not ask for help.

After all, apart from this phenomenon that seems like time and space reversal, there is no character in this world who can compete with him.

So, in the world of the fourth round, Li Yun replicated the actions of the previous round.

But this time, he did not leave the royal city, but stayed quietly to see what caused the world to roll back.

Sure enough, half a day after he defeated the hero, the Demon King's army arrived at the royal capital as if by teleportation, and then captured the entire capital with a devastating force, and then executed the king and the hero in public.

In the world of the fifth round, Li Yun looked at the scene in the palace where the king summoned heroes with a frown.

When the fifth unlucky hero was summoned, Li Yun acted decisively and killed everyone.

This was naturally not an act of venting anger, but Li Yun noticed in the last reincarnation that one of the two people, the king and the brave man, was the key person who caused the world to go backwards.

So, after the fifth round of attempts, he finally found this key person.

——It was the brave warrior from another world who was summoned!

As long as the hero is killed, the world will return to the moment when the king summoned the hero.

After discovering this, Li Yun thought he had found a breakthrough.

He crippled the hero in the world of the sixth round, and then sealed him in a crystal ball, ready to carry it with him to protect the hero and prevent the world from returning to the moment when the hero was summoned.

But what he didn't expect was that at the moment the hero was sealed, the world actually flowed backwards again.

This time, Li Yun felt numb all over.

I can't kill him, I can't defeat him, I can't even seal him...

So what should we do to leave the royal city and find out the truth?

So, Li Yun began to try various things, including but not limited to persuading the hero, defeating the Demon King's army, packing up and taking away the entire royal city, preventing the king from summoning the hero, and even ordering the Demon King's army to surrender to the hero in the name of the Demon King...

But no matter how he tried, the world would always return in one way or another to the moment when the king summoned the hero.

After twenty-seven rounds of attempts, Li Yun became angry. He transformed into the Demon King of Destruction and without hesitation released deadly nuclear light, completely annihilating the entire continent into dust.

Then, the world rolled back and time went backwards.

Li Yun stood in the palace, looking ahead with an expressionless face.

There, the twenty-eighth king is summoning the twenty-eighth hero.

When the brave man appeared, Li Yun was too lazy to be polite with him. He showed up directly and punched him, blasting him into a bloody mist.

He has lost all his patience and is ready to destroy this world in the most brutal way possible to see how many times it can be reincarnated.

So, the 29th round, the 30th round... the 158th round, the 159th round.

In just ten minutes, Li Yun made the entire world reincarnate hundreds of times.

During these hundreds of reincarnations, he discovered the second characteristic, which is that the hero's strength actually increases with each round.

It was just because Li Yun himself was too powerful that he failed to notice this 'tiny' improvement in strength.

Then, by the 160th round, the newly summoned heroes had reached level seven in strength.

Such power is naturally insignificant to Li Yun, but compared to the heroes in the first round, it is hundreds of thousands of times stronger.

The battle between the two, or Li Yun's unilateral crushing and instant killing, caused a terrifying energy tide to spread out, tearing the sky apart, blasting the earth, and causing the entire world to fall into chaos, and then recovering under that mysterious power.

This cycle repeats itself, seemingly without end.

…

…

On Earth, at the bottom of the Pacific Ocean in the center, there is an underwater base hundreds of meters high.

Three researchers in white coats stood in front of the one-way glass, holding recorders and recording documents, looking solemnly at the space behind the one-way glass.

It was a closed room with alloy walls. The facilities in the room were extremely simple. Apart from the incandescent lamp hanging from the ceiling, there was only a brown wooden desk, a brown wooden chair, and a book spread out on the desk.

At this time, a man in a brown uniform was sitting on a wooden chair in the room.

He was holding an ordinary-looking pencil and writing quickly on the open book.

Judging from the movements, the man's pen-holding posture is extremely standard and his writing movements are extremely smooth.

But when your eyes shift from the man's hand movements to his face, you will be shocked to find that the man's face is extremely old, and his eyes are cloudy and hazy as if mixed with impurities.

From the corners of his slightly grinning mouth, sticky saliva kept flowing, dripping onto the pants on his left leg.

There is no doubt that the man who is writing furiously is already an old man suffering from Alzheimer's disease.

But even though his thoughts were no longer clear, the old man did not stop writing, as if the person writing furiously was not him, but the pen, or the book.

"The king summoned a brave man, but he didn't expect that the world-destroying demon king Li Yun had already been waiting in the palace. When the brave man appeared, the demon king instantly released a blue-green light that was enough to destroy the world. It was the legendary world-destroying death light!"

"But the hero is not so easily defeated. He has the protection of the goddess (crossed out)... The Devil King of Destruction killed the hero with the strongest death ray in history, and destroyed the entire world with his monstrous demonic power."

A new line begins: "The king summoned the hero..."

Before he finished writing, the elderly man suddenly trembled, and his whole body exploded into a sky full of stars like a pile of building blocks.

Seeing this scene, the three white coats on the other side of the one-way glass looked solemn.

The man in the lead quickly pressed the red button in front of him, and the door on the wall suddenly opened. A young man in a yellow uniform walked in cautiously, sat on the chair where his predecessor had disappeared, looked at the book and pen in front of him, and swallowed.

"D-15621, pick up the pencil in front of you and write in the book."

"Write... write what?"

"Write whatever you want. It doesn't matter. What's important is that as long as you survive this experiment, all the crimes you have committed before will be erased by us."

"That's what you said!"

The young man was extremely excited. He gritted his teeth and finally picked up the pencil.

At this moment, he discovered to his horror that his hands were waving uncontrollably, constantly writing new content on the blank space of the paper...