"Brother, what are you smirking at with a rock?" Chen Ling looked at her brother stupidly at the stone and couldn't help asking.

"Huh? This is the crystal nucleus, the energy crystallization in the zombie corpse, which exists in the zombie's head. Chen Chen explained.

"What's it for?"

"This can be used for many purposes, to improve strength and build weapons. At the same time, it is also the hard currency of the last days, similar to gold in peacetime. But it's much more important than gold. ”

"Oh!" Chen Ling nodded as if she didn't understand. "Brother, where are we going now? Are you going back to your hometown to find your parents? ”

"I definitely want to go back to my hometown, but before we go back, we have to go to the academy first. Pick up my buddy in the same dorm, let's go. ”

"How dangerous is that? There are zombies everywhere. Can we get by? Chen Ling said with some concern.

"Let's be careful, it's okay!" After Chen Chen finished speaking, he poked his head out and glanced at the street.

Fortunately, there are not many zombies on the street, and there are only more than 10 of them, and the distance between them is still far away, so he estimates that there should be no problem in solving it himself. Then he turned his head and told his sister to wait for him here, and then rushed out.

In less than 3 minutes, Chen Ling saw her brother walking back, and after asking her to follow, her brother still searched for zombies one by one and collected 4 crystal nuclei. Now he has 7 crystal nuclei. Chen Chen was satisfied with the crystal nucleus into the space, and then led his sister to the corner of the street.

The two walked from 1 p.m. to 5 p.m., and the brother and sister walked about 8 kilometers. This is still the result of changing routes many times when there are too many zombies to deal with. Otherwise, I really wouldn't be where I am now.

Chen Chen looked at the surrounding environment left and right, determined the current location, and estimated that it would be at least about 4 kilometers away from the academy. The road in the last days was full of unknowns, and Chen Chen was really not sure that the two of them would be able to reach the academy before dark. And now it's about an hour and a half before it gets dark.

In the last days, it is too dangerous to travel at night. He didn't want his sister to be in any danger with him, so Chen Chen decided to find a temporary residence nearby to spend the night and set off again at dawn tomorrow.

The brother and sister finally chose a small supermarket on the first floor of a residential community. Because the door of the supermarket was open, after Chen Chen went in to search, he killed 4 zombies one after another, three men and one woman, and in the small warehouse in the back room, Chen Chen also found the body of a child who had not been eaten. It is estimated that Chen Ling will be frightened when she sees that terrifying scene. So Chen Chen threw the zombies and the girl's corpses out the back door before his sister could come in. As for the bloodstains, Chen Chen didn't plan to clean them up. After all, it is the end of the world, and the environment that should be adapted to his sister, Chen Chen still has to let his sister slowly adapt to it. If you can't overcome this difficulty, it will be really difficult for my sister to survive in the last days.

After the brother and sister closed the front and back doors, they carefully checked twice and found that there was no passage for people to enter, and then began to look for their favorite food in the supermarket. When the old sister was about to go out, she vomited up all the things in her stomach, and after a long day's journey, she was already tired and hungry. At this time, seeing so many snacks, it's still free, how can you bear it. I just opened the package and ate it.

Chen Chen simply ate some plastic cooked food and a piece of bread, and stopped when he felt that his stomach was not hungry. After lighting a cigarette, I wandered around the supermarket, and as long as I felt that I could use it in the future, I put it into the space.

After a search, the supermarket, which was originally full, suddenly became empty. This also frees up more space for the two to rest.

Chen Chen finished his work, lit a cigarette, lay on the recliner, and called up the system mall.

A virtual screen appeared in front of me. Then several big options emerged.

There are four options: living materials area, medicine area, weapons area and miscellaneous area.

Chen Chen clicked on the daily necessities area, and there were many branches below, food, clothing, drinking water, etc., of course, the colors were only the most common items. Similar to combat uniforms, functional food, kinetic drinks, etc., the color is gray, which is obviously not enough level and cannot be purchased.

Chen Chen clicked on the medicine area again, which displayed all kinds of commonly used medicines, including anti-inflammatory drugs, antipyretics, disinfectants, gauze and other goods, among the various items, Chen Chen actually saw that the genetic medicine and the evolution medicine were lit. As for the awakening potions, antiviral potions, etc., they are gray and obviously cannot be purchased.

The weapon area is much simpler, most of the available weapons are cold weapons, the only hot weapons are the 92 pistol and the Type 95 assault rifle, and the matching bullets are lit, and the other more powerful thermal weapons and crystal weapons are gray.

Miscellaneous will not be read. He is short on time now, and he feels that the first task is to improve his strength.

Click on the medicine area, find the gene potion, and find that you need 10 energy crystal nuclei.

"System, how to exchange the energy crystal nucleus needed to buy items?" Chen Chen began to communicate with the system in his heart based on the principle of asking questions if he didn't understand.

"There is no need to redeem it, as long as the crystal nucleus is stored in the space backpack, it will be automatically deducted when purchasing items." The system replied.

"Oh! What about the exchange ratio? For example, how to exchange the crystal nucleus in my hand with the energy crystal nucleus in the mall? Chen Chen asked worriedly, he was worried that the exchange ratio was very high, and he couldn't improve his sister's genes.

"The exchange ratio is 1:1. The exchange rate of high-level crystal nuclei is higher. ”

"Got it!" Chen Chen quickly bought a genetic potion, and then called his sister.

"Drink this! It can improve your cell genes and make you more powerful. Then you will have the ability to protect yourself. Chen Chen handed the genetic medicine to his sister and explained.

"Brother! Where did you get that? Are you sure this will work? You don't think of me like a guinea pig, do you? Chen Ling looked at the three-no product in her hand and asked uneasily.

"Don't worry, can my brother pit you? I've already drunk a bottle. Didn't you notice that I was very good at killing zombies? In order to increase Chen Ling's confidence, Chen Chen took himself as an example.

"Let's make it clear first, I didn't plan to rob you of the family property. You don't have to hurt me with this! Chen Ling made a joke, and then drank the potion. She must be 100% confident that her brother will not harm her.

"The process of cell division can be painful, hold on, it's just a matter of minutes." Chen Chen saw that his sister had drunk the medicine, and he was worried that she would not be able to bear the pain, so he explained in advance.

"Brother, you cheat me. Why didn't you say it earlier when it hurts so much? As soon as Chen Chen's words fell, Chen Ling was curled up on the ground by a sharp pain, and sweat flowed out at once.

After 3 minutes, Chen Ling's pain passed. And during this period, Chen Chen's nervous hands were clenched white.

"How does it feel?" Chen Chen looked at his sister nervously.

"It feels so good, as if my body has a lot of energy." Chen Ling said after feeling the condition of her body.

"I'll get you a weapon, and tomorrow my brother will take you to kill zombies. Do you like to use the type of weapon? ”

"Just use a knife! I feel that it should be convenient to cut zombies. Chen Ling thought for a moment and said.