In Ningxia, a secret base was built because of the geographical environment in the old civilization period. And these secret bases were naturally activated after the zombie outbreak.

"The city in the sky finally lifted off, and everyone was looking forward to the moment when the staff told the ground crew that they could go into the air after the flight was stable above. However...... After all, no one waits for this day. Suddenly, one day, gunshots rang out in the bunker. ”

"That day was the day when 'Peng' was able to fly stably, and everyone could finally make an appointment to take off to live, and all the engineers and workshop workers in the factory gathered in the underground square, waiting for the allocation of flight quotas for the aircraft. We were delayed because Little Joe had an upset stomach, and my dad went to the square first, and my mom and I stayed at home first. My mom got the news all of a sudden, and at the same time the smell of blood spread, and we all thought it was a zombie attack. My mom immediately told me to take my sister to hide in the safety cabin, but all I heard was gunshots, just gunshots. ”

"At that time, I hugged Lin Qiao, Lin Qiao asked me worriedly, if there were zombies attacking, I hugged him, I wanted to say 'yes', it is our usual enemy coming. But I know that this shouldn't be the case when zombies strike. He smiled wryly and dusted the ashes from his hand, "Those gunshots were fired at people." When it was all over, I told Little Joe to stay in the safety cabin and went out to have a look. Outside there were corpses all over the place, and all the people who had been excited to think they had built hope for all mankind had been killed. The corpses were lying there, and some of them had even mutated because they had been infected with the zombie virus......"

Lin Qiao was two years old that year, and Lin Si was ten years old.

Or, take Lin Qiao to the sky together.

Although he was not familiar with the entire air fortress, it just so happened that his father was in charge of the design and construction of the entrance and exit of the aircraft. Lin Si scoured the bunker and looked through all the blueprints he could find. Then, he took his sister through the dangerous square, passed through one quarantine warehouse and disinfection room after another, and finally got on the plane.

At that time, the Suzaku system was not yet fully mature, and the ability to identify residents was still limited to scanning the brand-name barcodes worn on their bodies, and Lin Si was like this, depriving the lives of the original 742 and 4749, putting on the white onesies on their bodies that originally belonged to Sky City, and joining the crowd so that their brothers and sisters could survive.

It wasn't until much later that Lin Si slowly thought that the people who had lived on the ground for so long had been more or less infected with the virus, and it was difficult to ensure that everyone would not mutate after coming to Sky City, and the same thing would not happen to the ground. No matter how strict the defense is, the more survivors come to Sky City, the greater the danger factor for Sky City.

It was during this period that Lin Si discovered 6237, which was always a little different from other children-that is, Murong Yuhua.

He began to approach 6237 intentionally or unintentionally, showing him the software devices he knew, and he was always quick to find a way to crack it, and quickly find out what could be changed or even overturned. The kid can even use the tools in his hands to constantly modify and create, his little head is stuffed with all kinds of whimsical ideas, and the world is just a set of physical structures and data in his eyes. Even at the age of five, he was able to write his own program code based on the first rules and design completely new AI programs.

Later, his AI also had a name: Juri.

At that time, Lin Si had been living in Sky City for some years, he watched generation after generation of people being classified and numb, he originally knew some lively and active children, but his temperament always changed greatly after the age of eight, in addition to 6237, of course, there were other people who had doubts about this world and this society.

At that time, Lin Si didn't think too much about it, he just hoped to win over an ally who would be able to find a way to resist the city in the future when they were all adults. But to his surprise, after listening to him tell him about the situation on the ground, 6237 would be so bold as to privately crack the defense system of the Sky City's carrier aircraft and drive all the way to the ground by himself.

Lin Si found 6237 in an abandoned building, the child curled up in a steel protective bag of his own making, covered in blood. The surrounding zombies had dispersed, and Lin Si skillfully took out his gun to silently solve this group of zombies, and then connected 6237 into the flight cabin.

6237 told Lin Si that this was the benefactor who saved his life, and her name was Gu San. He said that he would return to Sky City because only Sky City had enough resources to make his dream come true.

At that moment, Lin Si realized that all the geniuses in this world were actually crazy. 6237 is just one of the many madmen who have a relatively pleasant temperament.

His sister criticized him like all those who lived in Sky City, asking him how he could leave Sky City?

"Everybody has numbers, everybody has a role to play – we're luckier than too many people in the sky," she said. Numbers are everything, and technology is the truth of our lives. ”

And all this, he found that he was not even powerless to change at all.