Half a century has passed since the zombie outbreak and people began to flee, and nearly two generations have grown up in this era, and the new generation of young people can hardly remember what the earth looked like decades ago. How the original society should work, why people are worried, what kind of life they live - even if there are still films showing the bits and pieces of the old civilization, it is extremely difficult for the new generation to understand.

They have been taught from birth not to leave the fortress easily, and they have long been familiar with those equipped with prosthetics, making hunting and combat all compulsory subjects. Parents no longer have extra expectations for their children, they just want them to live a little longer, a little longer.

The former social politics have long since collapsed, and a new social form has gradually taken shape under the control of the castle in the sky. These "air visitors" will come to the ground in 2050. At that time, there was not much left of the fortress under the attack of zombies, and the remaining ones were in a precarious situation after housing the refugees. In such a situation, a city suddenly appeared in the sky.

Under the dome, the snow-white city-state appeared in front of everyone on a clear day, it was suspended in the air, and when it looked up, it was snow-white, and from the ground, it was impossible to see what it was like above. No one knows where the city in the sky came from, and no one knows if the city in the sky has been in that place all along. It just appeared, without warning, and some people even thought that a miracle had suddenly appeared.

And the day after the appearance of Sky City, a group of people in white robes came to the desperate survivors with the latest technology.

They brought prosthetic bodies.

Viruses are bound to evolve in the final analysis, and no one can guarantee that the serum that works today will not be ineffective next time due to virus mutations. In the end, it is inevitable that human beings will have to live with the virus. These white-robed men have no names, only signs, and they see themselves as "merchants" who come to the ground for "business". The survivors, who had already lost their money in the fighting, were surprised by their claims. The entire social economy has long since collapsed, what kind of people can do business in such a situation?

However, prosthetic technology is too precious for survivors, and too many of them have become disabled in order to survive, and some have chopped off their arms and lost their legs to prevent the spread of the virus. These people were able to survive for the time being while the fortress was still safe, and in the final analysis, some of them were disabled because they were once warriors.

Many people sacrifice their otherwise sound limbs for the lives of others, and their lives are nothing more than battles after battles, physical sacrifice is inevitable, and disability is better than losing one's life.

The bottom line is sometimes like this.

However, once the fortress falls, these people will undoubtedly become a liability, and they will even take the initiative to become death squads to burn their last bit of value.

Sacrifice, sacrifice, sacrifice. Originally, the only thing they could do in their lives was sacrifice, but the appearance of the prosthesis changed all that. Because of the prosthesis, the disabled person can regain the ability to fight, and because of the prosthesis, people can even block the penetration of the virus without hesitation. Prosthetics can replace almost every part of the human body, every set of organs. In addition to bringing equipment, those digital merchants have also brought the latest treatment and surgical methods to the ground.

In the face of such a technology that can change the fate of almost everyone, people see this group of people as saviors, and everyone thinks that it may take their lives to get it, but these sky visitors say that the reward they need is not money - no gold, no jewelry, only three things: zombie corpses, books and art.

People began to go crazy, and in order to change their fate, zombie hunters were born who were good at fighting and hunted zombies; Those who are not very capable of fighting, but who possess knowledge, put all the books they can find in their hands into the hands of these air visitors, and they are called scholars. The more adventurous, on the other hand, began to venture deep into the depths of deserted cities in search of art that had not yet been burned, and these people were called explorers.

In the beginning, a book could be exchanged for a hand, a sculpture could be exchanged for an arm, and the corpse of some zombies could be exchanged for an entire thigh. As more and more people changed their prostheses and learned about them, some people with more hands-on abilities began to research their own unique technology from the air, which gave birth to the "Robot Doctor".

As humans became stronger, the number of zombies decreased, the fortresses gradually expanded outward, and cities gradually took shape, and people once again showed their strong vitality, continuing to continue civilization on the ruins.

Sky Visitors set up warehouses, factories, and a mechanical clinic in the new city, performed surgeries on people who needed new equipment, and selected mechanics on the ground to take over the work in the clinic. Although there is no government or leader in the city, this group of air visitors quietly captures everyone with technology, and makes all those living in the new city submit.

No one wants to give up hope of life, as long as they can use machinery to block the invasion of the virus, no one wants to give up. Some extreme people choose to replace their original limbs with machinery even if they are not injured. For them, once they encounter zombies, being bitten and injured means that they will be infected to a certain extent, and then die, and the transformation of the body is just suffering from skin and flesh, but they no longer need to worry about this in the next life.

Over time, new rules were gradually set, and books and artworks were limited in the old civilization, but zombies seemed to never be killed, and over time, scholars and explorers slowly decreased, and zombie hunters became the most mainstream profession among people. The new currency began to circulate around the technological properties of the Sky City, and the people in the fortress relied on hunting zombies and the Sky City in exchange for technological products, and of course, there were many illegal elements who tried to snatch more things from these "merchants", but they were almost from two very different civilizations, and it was difficult to compete.

Someone watched these people fly off the ground and towards the sky, and more and more people began to speculate about where these people who suddenly appeared came from, although they brought new technology and hope for life, but they never gave anything more.

Human beings are always greedy, and they want more when they have one thing, especially when they see such a completely different life, everyone is human, and the other party is not an alien visitor, but a huge ravine is just like this between the two people, and the sky and the ground have formed a class opposite.

People began to believe more in the mechanical doctors on the ground, and they rejected the people who brought civilization to them, and they chose to smash the clinics set up by the digital merchants on the ground, stealing those mechanical parts in the name of freedom and equality, which happened in the year 2060, which is the tenth year of the arrival of the digital merchants in the air.

Some rumors have spread among people, some people say that zombies are a conspiracy and that everything is about domination. A huge lie hangs over everyone, and the so-called technological transformation is nothing more than the hope of controlling more people. Everyone's devices are connected to the Internet, and the largest network today comes from the city-states in the sky.

People looked up at the behemoth of the dome, and thought it was incomparably great and incomparably terrifying. These are the inevitable results of the gap between technology and civilization, people will always have mixed emotions about their own saviors, since a person can be saved, it means that his own processing ability has been denied, and in the end only incompetence remains.

But how many people are willing to admit their incompetence? In times of difficulty, they are anxious to change their lives, so they are grateful to those who have helped them, but once the circumstances change, the worries of life slowly fade away, and the embarrassment that belonged to them seems to be forgotten. At this time, when they look at their rescuers, they will feel that the other party is a stain that they can never wash away.

Every minute and every second of the other party's existence is nothing more than a reminder of how embarrassed they used to be and how incompetent they were.

It was against this backdrop and emotion that the riots broke out. People killed some of the digital merchants who were left on the ground, and as the bullet passed through their hearts, they truly realized that the blood coming out of the guy in front of them who looked completely different from their temperament was also red. They are also all humans, flesh and blood, and when they are attacked by zombies, they will also mutate and die.

Of course, Sky City will not ignore such a situation, after the smashing and looting, this time the air will no longer send humans, but let a group of AI police stay in the city-state, nominally to maintain law and order, to prevent further riots from destroying the current fortress peace, in fact, it is nothing more than using force to suppress this group of mobs living on the ground.

Some people rely on their bodies to be transformed, and want to fight these AI police, but every inch and every part of their body, even the tiniest parts come from the city in the air, and the AI will invade their equipment as soon as possible, and gently leave a sentence "The Suzaku system has taken over your equipment, please stay calm, Suzaku will make your life better." ”

It was only at that moment that people really realized that they could hardly escape their present fate, that they needed prosthetics in order to survive, that they had to obey their creators, that the people of the air controlled their destinies, and that they were firmly in the palm of their hands. They can only become slaves, honored by them, and obey their every command.