"Gao Zhihong, Zhang Qin, when is this, don't quarrel." Standing aside, the girl in jeans, who had not spoken, frowned, looked at the two of them, and showed a hint of disappointment in her eyes.

Zhang Qin and Gao Zhihong were obviously a little obedient to the jeans girl, and the two immediately stopped talking, glared at each other, stopped talking, and looked at Ye Feng, who was fighting with zombies in the playground.

The three people on the rooftop are all classmates in the same class, among which the jeans girl named Liu Ying is the class leader of their second nursing class, and she is also the class flower, and she is also a good friend of Zhang Qin.

After graduating from the Department of Nursing, you can become a nurse after obtaining a nurse certificate, this profession is generally dominated by girls, and there are very few boys.

It is not difficult for boys studying in the health school to find a beautiful girlfriend, after all, the ratio of men to women in the health school is almost 1 to 9, but Gao Zhihong did not find a girlfriend.

First, Gao Zhihong's family is average, less than 1.6 meters tall, dark-skinned, not handsome, and even a little obscene.

Second, his vision is still very high, and ordinary girls still look down on him, and he has been pursuing Liu Ying, the class leader and class flower, hoping to impress the beauties with his persistent pursuit.

As Liu Ying's good friend Zhang Qin, Gao Zhihong is very unpleasant, so naturally Gao Zhihong has been obstructing Gao Zhihong's pursuit of Liu Ying, resulting in a very bad relationship between the two.

Gao Zhihong turned around and glanced at Zhang Qin beside him, with a hint of resentment in his eyes, he hated and disgusted this fat woman who had repeatedly made obstacles.

His eyes moved and fell on Liu Ying, the resentful look in Gao Zhihong's eyes disappeared, revealing a trace of longing, his eyes wandered on Liu Ying's body, especially when he saw his buttocks wrapped in tight jeans, he couldn't help but swallow a mouthful of saliva.

Gao Zhihong has long coveted Liu Ying, and even when the three of them were hiding on the rooftop, Gao Zhihong fantasized about whether he could find a chance to strengthen Liu Ying, but thinking that he was less than one meter six, and his thin body, not to mention holding down Liu Ying, he may not have pounced on Liu Ying, and was directly sumo by Zhang Qin and sat on the ground.

"Oops, no, he was bitten by a zombie." Looking at Zhang Qin in the playground, his expression suddenly changed, and he couldn't help shouting.

Ye Feng on the playground was trapped in a group of corpses, surrounded by hundreds of zombies, although he had rich combat experience, there were too many zombies, and in a wide area like the playground, there were no obstacles that could be used to dodge, and he was almost attacked on all sides, and he was accidentally bitten by a zombie on the arm.

There is no need for Zhang Qin to remind her, Liu Ying also saw this scene, and her face was a little ugly, she planned to wait for this person to attract zombies, and then take the opportunity to escape, but now it seems that this person is also difficult to protect.

"It's time to leave." Ye Feng looked at the pocket hanging on his waist, which was filled with crystal nuclei, about a hundred of them, enough to extract two or three evolution liquids.

Ye Feng jumped five meters away, and then immediately rushed towards the outside of the playground, the evolution liquid extracted from these crystal nuclei, even if it could not completely restore the female corpse, it was enough to wake her up.

Ye Feng's speed was very fast, the zombies in front of him couldn't stop him at all, and in less than a minute, Ye Feng had already run out of the zombie group, left the playground, and ran wildly in the direction of the experimental building.

Just when Ye Feng shook off most of the zombies, he suddenly felt a strong wind behind him, and before he had time to think about it, Ye Feng pounced forward and lay on the ground.

The moment Ye Feng pounced, he only felt that something flew against his back, blowing a strong wind, and then he heard a muffled sound in front of him.

Looking up, Ye Feng's face showed surprise, only to see a kitchen knife stuck in a big tree in front of him, due to the excessive force, the wide blade of the knife was submerged into most of the trunk, leaving only the small half of the blade and the handle exposed.

If it weren't for Ye Feng's quick reaction just now, he fell to the ground in time, and with the power contained in this kitchen knife, it was enough to cut off Ye Feng's waist.

Ye Feng showed a trace of solemnity on his face, stood up, turned to look in the direction where the kitchen knife was flying, and saw that at the door of the cafeteria, there was a tall figure standing, and this figure was still holding a kitchen knife in his right hand.

Because the figure was carrying the sun behind him and was inside the door of the cafeteria, he couldn't see the specific appearance clearly, but the moment Ye Feng saw the figure, his pupils shrank suddenly, and he shouted in a lost voice: "Butcher!" ”

Butcher is a name for second-order zombies in later generations, this kind of zombie has moved away from relying solely on instinctive actions, and already has a certain thinking ability and knows how to use weapons to attack humans.

This kind of zombies, the favorite weapon to use, is a sharp kitchen knife, because kitchen knives are everywhere and are very easy to find, which is the favorite of these zombies.

It is precisely because these zombies like to grab kitchen knives to attack humans that they are called butchers by humans.

Of course, zombies are not fond of kitchen knives, but any weapon that can be used, and some zombies will also carry machetes and iron rods.

Fortunately, although these zombies are somewhat self-aware, they are still very stupid, with an IQ level similar to that of a gorilla, and they can't use firearms, otherwise, it would be a disaster for humans.

Seeing the second-order butcher, Ye Feng's face showed a trace of bitterness, with his current strength, it was absolutely impossible to be the butcher's opponent, the second-order zombie, in addition to the strength becoming more terrifying, there was also the speed, which was not inferior to the human sprint champion at all.

"I didn't expect that just the next day, a second-order zombie was born." Ye Feng's heart was depressed, and at the same time, he also felt unfair about the evolution between humans and zombies.

Zombies have crystal nuclei and can absorb dark energy in the air all the time, and they are evolving almost every minute, but there are only a few ways for humans to evolve, the most common of which is the evolution liquid.

However, if you want to extract the evolution liquid, you need a crystal nucleus, in other words, before the appearance of second-order zombies, it is almost impossible for humans to produce two-star evolutionaries, because there is no crystal nucleus of second-order zombies to extract second-order evolution liquid.

Not only are humans inferior to zombies, but even animals evolve much faster than humans, especially many animals, once they evolve, not only do they evolve faster, but at the same level, humans are not opponents at all.

Later scientists have not figured out why, but some biologists speculate that the reason why humans evolve the slowest is probably due to human genes.

Human genes are more stable than ordinary animals, and this stability has led to slow human evolution, but humans still have an advantage, that is, intelligence.

Zombies evolve quickly, but they lose their intelligence.