The content on the note made Chen Xin feel a little nervous and vigilant, he understood that this was obviously a big move by the police, and he was inadvertently involved in this matter.

Why Qin Lan and Ding Ning were given a month's vacation before, and why their shelter was investigated twice was also explained.

Chen Xin did not reject the matter of cooperating with the police, and it was a good thing that Qin Lan and Ding Ning could protect him.

However, the two girls moved to live with him, even if it was to protect him, it still caused a certain amount of trouble for Chen Xin.

After all, it's two girls, they live in his place, and where to sleep is a problem.

If only Qin Lan is good to say, anyway, it's not that the two of them haven't lived together, this can't be regarded as a problem.

But Ding Ning and Chen Xin are just ordinary friends, and they can't even talk about a particularly good relationship, which obviously causes Chen Xin's distress and makes him have to consider arranging a place for the two of them to live.

At the very least, a separate room should be arranged for Ding Ning.

While thinking about this question, Chen Xin also returned to his shelter.

Since he knew from Ding Ning that he might encounter danger, he was naturally concerned about the safety of the shelter.

After closing the gate, Chen Xin is also planning to improve some more protection, such as upgrading the gate, improving the protection performance and adding a little defensive weapon.

However, this can be postponed for the time being, and Chen Xin still has to take the lead in solving the housing problem after Ding Ning and Qin Lan come.

In fact, this problem is not too difficult to solve, after all, in addition to the bedroom and living room, he also has a medical room, if you don't mind, you can sleep on the multi-functional operating chair inside, after all, that chair is a temporary operating table after unfolding, the size of a train sleeper.

It's just that this is too simple, if Chen Xin has no other way, he can consider doing this, but when there are other ways to think of it, he still doesn't plan to do it.

Sitting in front of the workbench, opening the system interface, and browsing the various materials in the warehouse, Chen Xin was thinking about making a bunk bed by himself.

It is not complicated to make a high and low bed, and the materials to be used are also simple, if it is the kind of iron frame bed in the dormitory of Chen Xin University, it can even be welded with only a few steel pipes.

Chen Xin looked at the materials in his warehouse, there are still a batch of steel pipes, angle steel, channel steel and I-beam, there are still a few pieces, and he wants to weld a high and low bed, even if there is no system, Chen Xin can use these materials to make it himself as long as he knows how to weld.

So Chen Xin did not hesitate, dragged out two steel pipes from the storage room and cut them into four columns, and then used four angle steels to cut them off and welded them into two rectangular frames, and connected the four columns to the top corners of the two rectangular frames, and a frame with a high and low bed was done.

Weld a few beams in a rectangular frame, and then lay the bed board, this bed can be used to sleep, Chen Xin's dormitory high and low beds in college are such things, the quality may not be as solid as Chen Xin's own work, after all, he has the impression that there was an overweight classmate in their class who collapsed the bed.

However, although the high and low beds were made, Chen Xin didn't dare to use this for Qin Lan and Ding Ning to sleep on, after all, it was too simple, and there was not even a bed board.

So after making the steel frame, Chen Xin still found a composite board and an iron sheet from the warehouse as additional materials, and spent 20 survival points to upgrade the bed.

The upgraded bed looks a little bit bigger, the four pillars have been thickened a lot, there are more bed boards on the bed, and there is an extra ladder for going up and down next to it, which already looks like that.

With the bed, the rest is easy.

Leaving the workbench, coming to the bedroom, looking at his bedroom, Chen Xin opened the system interface again.

"Modular Container House - Bedroom Component"

"Upgrade plan 1: upgrade the material of the box, improve the thermal insulation performance, upgrade the temperature regulation and air circulation performance, life support level +1, and upgrade the survival point required 3000"

"Upgrade plan 2: upgrade the internal soft decoration materials, increase the smart home function, the living comfort level +1, the overall technology level +1, and the survival point required for the upgrade is 4500"

This is the data displayed by the system when Chen Xin checked the bedroom upgrade options before, but after Chen Xin figured out how to use the system, he can now control the upgrade direction of the upgrade plan.

So when he opened the upgrade screen in the bedroom again, the displayed data became:

"Modular Container House - Bedroom Component"

"Upgrade plan 1: expand the living area, capacity +3, upgrade the box material, improve the thermal insulation performance, upgrade the temperature regulation, air circulation performance, life support level +1, upgrade the required survival point 5000"

"Upgrade plan 2: living space +1 (a single living space can accommodate 2 people), upgrade the internal soft decoration materials, increase smart home functions, living comfort level +1, overall technology level +1, upgrade the required survival point 6500"

The price has risen, but the upgrade plan has also clearly added something.

Seeing that under the influence of his own will, the system upgrade plan changed, Chen Xin immediately nodded with satisfaction, as for the cost of the upgrade, the materials required for the two upgrade plans were available in his storage room, and the materials prepared by Chen Xin for the overall upgrade shelter had a considerable degree of coverage, so Chen Xin could completely get the upgrade materials needed for both plans.

However, in this case, about one-fifth of the materials he had in reserve would be used up first, which would undoubtedly have a great impact on his desire to upgrade the Vault as a whole.

However, at present, the materials for upgrading the shelter as a whole have not been gathered, and it seems that it is not impossible to appropriate a part of it to upgrade the bedroom that is urgently needed at the moment, after all, it was originally going to get another batch of materials, and now the appropriation is nothing more than getting more materials.

After thinking about it, Chen Xin only chose the upgrade of option 2.

Invested in the materials, used the survival point, confirmed the upgrade, and the green light still flashed, everything was as simple as changing the computer display interface to a theme style, just a refresh, and everything became different.

The bunk bed that Chen Xin had made just now had disappeared from the workbench, and a new door had appeared next to the original bedroom door in the living room.

Open the door and enter, what catches your eye is a bedroom that looks like a sense of technology, and at the same time has a little futuristic color, simple style, white main color, and warm light source, making this bedroom look not like a refuge in the apocalypse, but a bit of a future residence in a science fiction movie.