When Chen Qing realized these contents, he also understood some of the rules about this backroom.

When he stepped foot in the tulou, it was the past. And every time I leave the tulou, I come to the present in the past.

And every time I set off towards a new tulou, I am returning to the "present" step by step.

That is, to go back to the back room when I first entered the tulou.

And since the three prompts are true, it can be deduced that when the content written on the document is "false" or "non-existent", the content on the document will become a reality.

And when the reality of what happened in the "current tulou" is really written on the document, nothing happens. It's just that they all recorded the situation in the tulou when they entered the tulou for the first and second time, so the above investigators all met the rules of recording history on the paper, and successfully left, or entered the next tulou and entered the future.

Because they are in the past, what is recorded will happen in the future, and when they record the past that is in the present, everything has already happened.

That's the first rule: you have to record what happened in history.

And after Chen Qing discovered this rule, he began to test the nodes of future changes. So he wrote down the record and let the past appear donuts.

However, after he recorded the contents, he found that the past of "then" had not changed, that is, the irreversibility of time was still true. It also coincides with the words in the prompt.

The future can only be modified in the present and in the past. But the future cannot modify the traces left by the past.

This is the second rule: the past time cannot be affected by the future, but the past time can affect the future.

After realizing this, Chen Qing began to come up with a plan.

In this tulou, as long as you are buried under this piece of yellow sand, you can constantly modify the future to achieve your goals.

But if he wants to be satisfied with the past influencing the future, he must have a pair of eyes to know what will happen in the future.

So, he wrote down a line of records.

"The dead will return to the place where they were born."

After this line was written, Chen Qing and Jiang Wan, who were located in the yellow sand, would naturally not be affected, but when they used Yin Yang Lixiao to cut themselves into two, when Jiang Wan lost all her memories and personality, she lay on the bed, and was bound by ropes.

After Chen Qing left the "killing the life that appeared in front of him" in his body, and separated all the remaining memories from his personality, the two had eyes to observe the future.

After their consciousness shifted to the separation, the meaning of the separation of the two went to the second tulou and the third tulou.

And because Chen Qing used a human skin mask, the separated body changed his image, which further stimulated the contradiction between the Divine Charity Sect and the Foundation.

When they had completed the whole journey and died, they returned to the first tulou.

After they arrived at the position at the beginning of their birth, Chen Qing and Jiang Wan took back their memories of the future. And according to the future situation, write on paper what can change the tide of the battle.

"Let everything that affects me go back to the beginning."

And this is related to the most important rule in this backroom.

The past cannot be changed, but the fragrance of birds and flowers when Chen Qing first entered is the present, that is the present and reality.

All the disasters experienced in these tulou buildings should have happened, and they should have been changed by history to be like that.

This is a thing of the past, an established fact that has already happened. The past doesn't need to be changed by anyone.

The past will naturally evolve into what it is now. Anyone who tries to describe the past and change the past will not be recognized by history.

It is also because of this rule that Chen Qing and Jiang Wan are the only two people who meet the three rules of the back room here, so that the two can embark on the road that can lead to the future and the road to what they want.

Walked to Level 2 of the Backrooms.

After the two walked side by side for about ten minutes, in front of Chen Qing and Jiang Wan, a huge arch stood on both sides of the path, and after passing through the arch, they arrived at the entrance of a bunker in the style of a small hill.

The two approached, and the entrance to the bunker was marked with a series of numbers of unknown meaning written in ink.

SBL-1701。

The doors of the bunker were already covered with rust, and the cast-iron gates were already visibly thinner.

He touched the door, but the mark on the door was unusually new, and the line of characters even had a slight sticky feeling when touched, and I am afraid that it would not have been written in a few days.

Chen Qing knocked on the door gently, and the iron ring on the door collided with the iron door, and the sound spread throughout the bunker and then returned, making the sound a little louder.

After three consecutive knocks, the door to the bunker opened.

Through the gate, the field of vision in the bunker is very narrow, and only a dozen meters of the environment can be detected.

Further down, it was completely covered in darkness.

Chen Qing and the others walked into it, and at the moment when they just entered the door, the iron door behind the two of them slammed shut.

The sound was so loud that the door of the cast iron was very heavy, and a pressure pushed the two of them to stagger forward two steps, and their eyes left their side with the two staggers.

When they raised their heads again, looking for their companions, Chen Qing could no longer find Jiang Wan's figure, he frowned slightly, and after looking around, a table lamp not far away suddenly lit up.

Through that lamp, Chen Qing saw the things around him clearly.

And the scene around him was not the same as what he had seen through the outside light when he first entered.

The place was cluttered, with countless fragments piled up everywhere, and countless bones of all kinds scattered all over the place.

He kicked a path out of his feet and walked towards the lamp that was lit.

Under that lamp, there was a table and two chairs.

The chair was dusty, but the table was clean.

Chen Qing leaned over and sat down, and the table lamp in front of him began to change its light.

From orange to a little bit of blue on the wick.

The blue light diffused in the room, lighting up everything in an eerie look.

"You can take what you want from it." In the darkness, a voice was heard.

The voice was old and thick, like a man who had contracted lung disease in the age of a sixtieth year, and the old man was speaking.

"It's not what I want." Chen Qing shook his head, he had already checked his surroundings the moment the lights came on.

He was convinced that what was placed in one place didn't matter.

"Then you leave."

He shook his head again: "I haven't found what I'm looking for yet." ”

"What do you want?"

"We want knowledge that is kept on paper, data that can only be passed on by word of mouth."

The voices in the shadows fell silent, causing the bunker to be silent for a moment.

After another moment, a woman's voice sounded in the bunker.

Her voice was a little lazy, as if she had just woken up after a long sleep.

She groaned and asked Chen Qing, "What do you want?" What do you want to take away. Knowledge is always the most expensive thing under the same goods, what do you exchange with me? ”

Chen Qing touched his chin and asked in the shadows, "I need to know what knowledge you can give me." Occultism? Or science. ”

The voice seemed to be laughing, but not like mockery, she laughed several times before answering Chen Qing: "Science." Science, of course. Everything in this world can be answered by science. Even the occult is just ignorant. ”

As the words fell, a woman in a cheongsam stepped out of the shadows.

Her graceful, coiled hair was shiny, her fingertips were stained with a little solution that had not been washed off, and her face was wrinkled, but she didn't look very old.

She sat down in front of Chen Qing, her legs folded cross, and she held a fan in her left hand, on which were written a large number of fine numbers.

The numbers are not large, but they are extremely complex, densely packed like ants.

She bent forward, so large that she was already against the table.

"I can give you all the knowledge you want. But in other words, what can you offer me? ”

Chen Qing listened, a little surprised in his heart, but then, he withdrew the divergent thoughts in his heart and focused on the front.

"I can offer an intangible cultural heritage in return. Hope in exchange for the Foundation's promotion of intangible cultural heritage. ”

"Oh?" She smiled slightly, and continued, "Did you know that what you were trading for was one of the routes to a human promotion? Take the contemporary price of intangible cultural heritage? Then I'm afraid you'll have to find an S-class. ”

Chen Qing frowned, and instantly realized something.

She didn't wonder what the non-heritage she was talking about? She's been in conversation with other people.

He looked at each other, but took the woman and just sat quietly and continued to wait.

"I just need a few routes."

"A couple of routes won't be worth the price."

"You can tell me one more story."

"Stories don't come for free."

"Your story."

"My story is going to cost more."

Chen Qing listened, took out the small square from his pocket and put it on the table.

"How about using this, in exchange for your golden mouth, and how about you became a traitor?"

She smiled slightly, but didn't take her eyes off the cube.

"It's a complicated story. But for the sake of old acquaintances......" She hesitated for a moment, and then asked Chen Qing: "If you can sign a contract with me." I will base all my knowledge on you. ”

Chen Qing looked at her, staring at the other party's eyes, and after staring for more than half a minute, he spoke: "I don't think I have so much capital enough to exchange for all your wealth. ”

"Maybe you have?" She smiled and continued to ask Chen Qing, "If you sign this contract with me. Then there you have it. ”