"So, originally, the world was destroyed because my sister was defeated by Lucifer?" Freya followed Tokine along the road.

Shi Yin seemed very familiar with this road, turning each corner without any hesitation.

"No, it's mutual destruction." The journey wasn't short, and Shi Yin was willing to elaborate: "However, there are too few humans to form a society, and with the zombies still not cleared out, there are hardly any left in the third generation."

"Among these two hundred-plus people, not all of them are equal numbers of men and women. There are elderly people, children, and middle-aged people in their forties and fifties. In reality, the number of people who can reproduce is only about one hundred."

"Moreover, when the environment is not suitable for the survival of a species, the species will instinctively stop reproducing. Humans are the same. As you have seen, the land is now severely polluted and barren, and there are no farmers or fertilizers, so food is a problem."

Shi Yin pointed to the surrounding land.

Leaving aside whether the rampant growth of surrounding plants can provide nutrients and growing space for normally growing crops.

Take this red soil that has already turned to sand, for example. Even before the apocalypse, the most advanced technology had to be tested repeatedly, let alone people today.

"Moreover... unlike us, this world doesn't have the most advanced water purification equipment. The only water source might only have two superhumans. But in this world, more than 90% of the water sources have been polluted and destroyed, making them undrinkable."

In fact, people started researching water purifiers as early as when the world's first river was polluted.

However, many of the places identified in the research were small and lacked sufficient military force to protect them, leading to fierce competition among various powers. Faced with zombies and natural disasters, humanity failed to unite and confront them together, instead choosing to act as their own rulers, which was clearly the worst possible outcome.

Therefore, in this life, Shi Yin allowed the Yanlong Kingdom to directly seize this lifeline.

"Finding communications at the locations where Lucifer is, and then locating the people hiding in the various laboratories, is actually quite easy. However, the number of zombies won't increase, and therefore the number of superhumans won't increase either."

Therefore, there will be no more water-based ability users in the future.

“What if those culprits who threatened the lab invent a water purifier?” Freya suggested. “Surely not all of them are dead?”

“Indeed, but would you dare use the things they invent?” Shi Yin asked rhetorically.

Freya: "Hmm..."

Those people could release the zombie virus without anyone noticing, so it would be too easy for them to do something underhanded. This is a battle where there is no trust.

“The huge laboratory initially had hundreds of thousands of people, but after repeated exterminations by humans, their numbers have been decreasing, and now there are at most only a few thousand left.” At this point, Shi Yin took a deep breath: “They transformed the world to be suitable for zombies to live in, excluding even themselves.”

"Didn't they think of that?" Nan Zhu asked, puzzled.

"The person who invented this virus, like Lucifer, only thought about destroying the world, not about surviving," Shi Yin explained. "The path to control the world by controlling zombies was discovered later by someone with malicious intent."

Although the previous statement wasn't exactly well-intentioned.

"Huh? Something's not right." Freya felt something was off: "Don't these people think of the zombie virus as an elixir of immortality?"

"That's the understanding of later generations. If there was a second group, why wouldn't there be a third?" Shi Yin ruffled Freya's hair. "How could hundreds of thousands of geniuses have a unified opinion when they gather together?"

“They call us the Old World, and we are still each a country. They call themselves the New World, so how can we be a unified country?” Shi Yin gently shook her head: “What is divided for a long time will unite, and what is united for a long time will divide. The smaller the group and the more geniuses it has, the more likely this situation will occur.”

As they walked, the three of them arrived at that peaceful shelter again.

Shi Yin looked up at her surroundings, at the dilapidated houses, and then at the low rooms in the shelter, as if she had been transported to another world.

Shi Yin stepped forward. She hadn't thought about this shelter for a long time, nor had she taken things to this point in a long time, so it took her some time to explore the underground passage.

The top few layers of thick steel doors were locked tightly, but one could vaguely sense the presence of someone below, clearly someone was desperately listening for any sounds from the outside world.

Shi Yin: "A woman is like a flower at eighteen."

Freya: "?"

Nanzhu: "??"

Half a day later, a muffled sound suddenly came from a small loudspeaker next to us.

[A man at eighteen plays in the mud.]

A newborn calf is not afraid of a tiger.

Shi Yin: "Old Tang is only 1.5 meters tall."

[I'm 1.8 meters tall!]

Shi Yin: "According to the height formula, a man's height is 1.8 meters until death. If it's more than 5 meters, subtract 4; if it's less than 5 meters, get zero. So your height is..."

"Smack!"

The heavy iron gate was suddenly pushed open, kicking up a cloud of dust.

Nan Zhu and Freya were bewildered by the wind, while Shi Yin calmly squatted on the ground, meeting the gaze of the head that had poked out.

"Shut up, it's impolite to say anything more." Old Tang said dejectedly, "I'm not 180cm because I didn't have enough nutrition in my time. If I ate as well as you, I'd be at least 185cm."

"Fine, I'll let it go since you're back safe and sound." Old Tang patted his chest, in a good mood: "Is the apocalypse over now?"

Actually, even without Lao Tang saying anything more, just looking out the window, one could already see hope.

Now the blue sky covers the vast majority of the sky, and the red glow outside has faded to almost invisible.

"No, you still need to find those thousands of people hiding in those labs and eliminate them completely before you can think about survival." Shi Yin carefully instructed, "Those people don't actually have much strength, and they have very few firearms. The main problem is that there are still a lot of zombies."

"However, most of the high-level zombies are dead now, and it's difficult for them to obey orders anymore. I remember you still have a map, right? I'll draw the location for you."

"No rush, we finally defeated the apocalypse, let's have a celebration feast today!" Old Tang was very excited: "Today we can really have a good meal together."

"I'm not going, and I probably won't come back," Shi Yin said softly.

Old Tang was taken aback: "Huh?"

“You know, my parents loved to travel when they were alive, but I never had the chance to take them.” Shi Yin’s voice softened a bit: “From now on, I will take them to travel the world, and we will clear out a group of zombies in each place we go, which will reduce your stress a lot.”

As they passed through the narrow passage, several people who hadn't seen Old Tang for so long curiously peered out, and when they saw him, Yindu's eyes lit up with surprise.

Shi Yin nodded and waved to them.

“You still have a lot of gunpowder stored up. If you head south from here, you’ll come across a relatively fertile land.” Shi Yin began drawing on the map.

“If you cut open the branches of the trees there, you’ll find clean water inside. The natural regulation of the water may take hundreds of years. However, you can also try repeatedly distilling and filtering the water to get clean water, but it’s more troublesome and time-consuming.”

“These three places are all laboratory sites. You should first settle the laboratories in the Yanlong Kingdom, let the population grow and multiply, and then go there.”

"And also, this is really goodbye."