Lin Xian's idea was simple.

This would also be a good opportunity to determine if the safe was actually his, or just a misunderstanding due to a shared name.

"Just write a letter advising my future self to set this password as the fixed password when setting a new hafnium alloy safe password in the future."

Lin Xian didn't think he was a very stubborn person.

At least, he shouldn't be stubborn with his past self, right?

No one punches themselves with both hands.

Actually, Lin Xian was also clear.

The moment he clearly had this thought, there was no need to write this letter anymore.

Because as long as he clearly had this thought, his future self would definitely abide by it. There was no need for such troublesome letters to transmit information between himself and himself.

"But I should still write it down as proof, in case I forget it after decades."

Professor Xu Yun said that going into hibernation in a hibernation pod has the side effect of memory loss.

No one can predict the future. What if one day he really needs to go into a hibernation pod, and then suffer memory loss, forgetting the password agreement, then today's plan would be for nothing again.

And so.

He picked up a pen and wrote:

Dear Future Me:

Hello.

I am Lin Xian from 2023. When you set a hafnium alloy safe with an eight-digit password in the future, please be sure to set the password to 29990203.

Perhaps you didn't set the password to our most commonly used birthday for confidentiality reasons. But now I think this password is secure enough, trust me.

0203 is our lunar birthday, and 2999 is a thousand years after our birth year. It's not hard to remember.

Don't make things difficult for yourself!

If this safe was really set by you at some point, be sure to set the password to 29990203!

Remember this!

……

After finishing writing, Lin Xian closed the pen cap and looked at the letter he had written to himself.

Weird, silly.

But it doesn't matter, the purpose has been achieved.

From now on, he has strengthened his belief—

"No matter what happens in the future, no matter what memorable date you encounter, you must set the password for the hafnium alloy safe to 29990203!"

Lin Xian silently repeated this sentence in his heart several times.

Ok.

It can be considered that the thought imprint has been applied.

If this safe is really his, and the password was set by his future self.

Then the space-time butterfly effect should have taken effect from now on.

After entering the dream tomorrow.

The safe with his name on it... should have the password changed to 29990203!

He stood up.

Folded the letter carefully.

Put it in the small iron box in the closet.

This small iron box contains many small gadgets, all of which are small objects of significance in Lin Xian's life. He hasn't been willing to throw them away for so many years, and this letter fits perfectly here.

Moreover, the thought imprint has already been applied.

"I believe my future self won't go back on his word."

After finishing packing up.

Lin Xian sat down at the desk again.

There were many gains in the dream...

But at the same time, there were also many mysteries brought about.

There must be a plan with priorities, to figure out these things one by one.

First of all, the simplest and easiest thing to solve is to meet with CC, figure out her identity, and try to open the hafnium alloy safe.

Then, find a way to sneak into New East Sea City.

In addition to finding those two books, it would be even better if he could find Big Face Cat's father.

Numerous clues have indicated that the cosmic constant 42 is a crucial clue, an extremely mysterious number, and even something the Genius Club fears.

Figuring out the meaning of the cosmic constant 42 may be the key to truly understanding the Genius Club and mastering the power to fight against it.

If you let the current Lin Xian guess...

He simply can't imagine how much destructive power an ordinary number can have? What's so scary about it?

Even the Space-Time Law that he summarized has the big gun of the space-time butterfly effect, which can fire at the future 600 years later.

But 42 is just an ordinary number...

Big Face Cat's father wrote 42 all over the wall, but he couldn't collapse the house.

With Lin Xian's thinking, it's impossible to imagine what special meaning or power 42 has.

Just ask Big Face Cat's father directly.

This is the simplest method in terms of process.

But it's the most difficult in terms of implementation.

First of all, whether it's safe to sneak into New East Sea City is a question.

Not to mention the area of New East Sea City... it looks even bigger than the current East Sea City. Lin Xian really isn't confident that he can find Big Face Cat's father in this vast sea of people.

In addition, Big Face Cat's father isn't going there for tourism, but is very likely to be captured and controlled by the Genius Club.

In this case, it will be even more difficult to find him.

Even if he can find his specific location, how to break through the Genius Club's defense line and how to safely see Big Face Cat's father is also an unsolvable problem.

"Since the Genius Club has captured Big Face Cat's father... they will definitely guard him strictly."

"If my previous speculation is correct, and the Genius Club will definitely kill scientists at 00:42, then there is enough time, at least Big Face Cat's father will be alive before 00:42."

"But... these are all speculations, who knows if the details in the second dream have changed?"

Lin Xian sighed.

He increasingly felt that this plan was too difficult to achieve.

The Genius Club is undoubtedly powerful, at least with some weapons and equipment.

But what does he have?

Li Chengdu is already the boss of Old East Sea, but he doesn't even have a gun.

CC does have a gun in her hand...

But Lin Xian didn't look too carefully at the time, and felt that the gun was flashy and didn't look like a normal pistol.

Even if it is a pistol, so what?

Relying on a single pistol to break into a sci-fi steel metropolis... even Hollywood blockbusters wouldn't dare to shoot it like that. Not to mention that New East Sea City is definitely full of dangers, with various police patrols and the like.

"Very difficult."

As for the second-best Plan B...

... is to find the original author of *Introduction to the Cosmic Constant* in 2023.

Lin Xian picked up his mobile phone, opened the search engine, and entered the keywords *Introduction to the Cosmic Constant*.

Since Big Face Cat's father said that this book was a 600-year-old ancient book, dug out from a tomb.

600 years before 2624... is 2024.

That is, next year.

Since someone who dies next year will put a book in their coffin, it means that the book should have been published at least a few years ago.

This kind of academic book is different. Writing one takes many years, and some scholars even spend their whole lives researching to write an academic material.

Lin Xian also thought in his dream before that he might be able to find the relevant publication information of this book online. There were too many things to think about in this dream, and he forgot directly.

He believes that even if he can't search for the book *Introduction to the Cosmic Constant* online, he can at least search for some fragmented information, right?

However...

It's very disappointing.

Nothing can be found on the internet.

There is no information about this book, nothing.

Just as Lin Xian casually slid his index finger, preparing to lock the phone screen...

Suddenly.

A person's name in a search result caught Lin Xian's attention—

Einstein.

"I remember."

Seeing the name Einstein, Lin Xian instantly remembered that this great man did have a certain relationship with the cosmic constant.

Einstein's achievements are great, and there are many interesting stories, and the cosmic constant is one of them.

When he was young, in order to explain the existence of a static universe, he added a proportional constant with a very small value to the gravitational field equation.

The value of this constant is so small that it can be ignored even on the scale of the Milky Way, and it is only meaningful when placed on the scale of the universe, so it is called the cosmic constant.

What's more dramatic is that Einstein in his later years denied his younger self, saying that the cosmic constant was a mistake and that this kind of thing did not exist. He even regretted it, saying that the biggest mistake he made in his life was adding the cosmic constant to the general theory of relativity equation.

Fighting with himself.

A very interesting scientific anecdote.

But Lin Xian knew in his heart.

The cosmic constant in Einstein's mouth is completely different from the cosmic constant 42 in Big Face Cat's father's mouth, and has no reference value for him.

If Lin Xian traveled back now and told Einstein:

"Brother Ai, the cosmic constant is 42."

If Einstein can even look at him once, it's considered Einstein's loss.

So...

This is also useless information.

Click.

Lin Xian turned off his phone.

Since no information about *Introduction to the Cosmic Constant* can be found online...

Then to comprehend the true meaning of 42, he still has to sneak into New East Sea City according to the original plan.

He got up and went to the kitchen.

He took out the oven-specific baking tray again, crumpled the A4 paper he had just written down while sorting out his thoughts into a ball, and placed it in the baking tray.

Watching the flames ignite, dancing in the imperceptible air currents.

It's better to be safe than sorry.

These pieces of paper of reasoning not only revealed his desire to explore the Genius Club, but also involved the cosmic constant 42 and changes in the future world.

Obviously, these are all things that stand on the "opposite side" of the Genius Club.

Once discovered or leaked, it's hard to guarantee that one day he will be knocked off the street like Xu Yun.

Even...

"Xu Yun is a great scientist, and deserves to be elaborately planned for an accidental death at 00:42."

"A small fry like me really doesn't know how I'll be killed."

Therefore.

Under the premise that the Genius Club is determined to exist and may be stirring up the river of history in the dark, no amount of caution is too much, and no amount of prudence is worthwhile.

Not to mention, the position of X Company and Zhao Yingjun is also an unknown.

"Walking on thin ice..."

Watching the flames in the baking tray burn out, Lin Xian poured the ashes into the toilet and flushed them clean, then lay down on the bed and took a nap.

……

The next morning, Lin Xian didn't go to the company.

After going to a nearby shopping mall to eat something to fill his stomach, he went directly to a private cinema.

This is different from a normal cinema. It can provide you with a private room to watch movies, and you can order old movies to watch.

Of course, newly released or currently showing movies are not available here.

Beep.

After scanning the code to pay for a movie, the waiter boy looked up and handed Lin Xian an iPad for selecting movies with a smile:

"Buddy, what movie are you planning to watch? We have a complete selection of resources here, and most old movies are available. And our private cinema is a national chain, and all movies are officially licensed, high-definition and have official easter eggs."

Lin Xian nodded:

"Genuine is good."

"We must support genuine products."

He slid the iPad and found the movie he had watched before, but now it was necessary to watch it again:

"I'll watch this movie—"

"*The Hitchhiker's Guide to the Galaxy*."