When Ye Lei arrived at the back gate of the school, he found that the main gate had been locked with an iron gate, and there were several security guards inside patrolling back and forth with batons.

Ye Lei parked his car and walked towards the entrance, with the female knight following behind him. The security guards immediately tensed up when they saw the zombies.

"Young man, there are zombies behind you, be careful!"

Ye Lei was grateful for the security guard's kind reminder.

"It's okay, she won't bite me!"

Ye Lei said with a smile.

"It won't bite you, why? Did you raise it yourself?"

The security guard was confused by Ye Lei's words.

"Just pretend that's how it is, open the door and let me in!"

Ye Lei didn't have time to explain these things to a security guard.

"Are you a student of this school? Only students of this school are allowed to come in!"

"Of course I am! You'll see!"

Ye Lei took out his slightly wrinkled student ID from his pocket and handed it to the security guard.

"You can come in, but the zombies behind you can't."

The security guard said righteously that this was also his duty.

"Why? Look, he doesn't bite me, and he won't bite you either!"

"That won't do. Our orders are that zombies are not allowed on campus!"

"What if we absolutely have to go in?"

Ye Lei was starting to lose patience.

"This student, there's really no other way. Either you come in alone, or none of you come in. You can only choose one."

Is this really necessary?

Ye Lei is not good at making choices, and he doesn't like others making him choose.

"I'm sorry, this is our job!"

"Alright, considering how well you've done your job, I won't make things difficult for you!"

Even in this apocalyptic world, when everyone is busy trying to escape, Ye Lei has the utmost respect for those who can still work.

However, he was determined to go in. He had finally managed to control such an excellent zombie, and he wouldn't give up.

He grabbed the female knight and calmly activated his teleportation ability. With a "whoosh," a person and a corpse appeared in the school before even Ye Lei could react.

"You can't come in, get out now!"

The security guard inside shouted loudly when he saw the zombie that suddenly appeared. The security guard at the door was confused when he saw the person and the zombie that had suddenly disappeared. Hearing the shout from behind, he realized that they had already come in. What was going on?

"Didn't you hear me telling you to get out?"

The security guard was still shouting.

Once Ye Lei realized what was happening, he ignored him and grabbed the female knight, running like the wind towards the back of the school with his speed attribute of 230.

In their eyes, he vanished like lightning, leaving the security guard, who felt as if he had just woken from a dream, standing there dumbfounded.

Arriving at the back hill of the school, we found ourselves at a high elevation, overlooking the entire campus. It was a place full of mystery and tranquility.

Nestled behind the bustling teaching and living areas, it seems like a forgotten treasure, quietly waiting for those eager to explore to discover its beauty.

This hillside behind the mountain offers different scenery in each of the four seasons.

In spring, the trees on the mountain sprout tender green buds, and the flowers bloom in profusion, emitting a fragrant aroma that attracts butterflies and bees to flit among the flowers, creating a vibrant scene.

In summer, the dense foliage provides cool shade for the mountain paths, where students stroll in groups of three or five or alone, enjoying the freshness and tranquility of summer.

In autumn, the back hills transform into a golden sea, with fallen leaves carpeting the paths like gold, rustling underfoot and evoking thoughts of the passage of time and the power of knowledge.

In winter, snowflakes cover the entire mountain, creating a pristine white landscape reminiscent of a fairytale, evoking a sense of purity and tranquility.

Besides its natural scenery, the back hill is also a great place for students to relax and have fun. Some corners have stone tables and benches for playing chess and chatting.

Some platforms have viewing platforms that offer panoramic views of the entire campus and the city skyline.

Some secluded spots have become secret gardens for couples to date, witnessing countless beautiful moments of youth.

This place, which the students once considered a paradise, is now very quiet and deserted, with only Ye Lei and the female knight standing there.

Ye Lei didn't know if this place was suitable for building a shelter, so he decided to summon the system and ask. He gently touched his spatial ring and sent out his thoughts.

[Host, the following requirements should be considered when constructing a shelter:]

1. Geographical Location: Choose a location that is geographically advantageous, resource-rich, and easily defensible. Ideally, it should be far from potential disaster sources such as volcanoes, earthquake zones, and flood-prone areas. Water and food sources, as well as climate conditions, should also be considered.

2. Structural Safety: The shelter's structure should be robust and durable, capable of withstanding external threats such as zombies, nuclear radiation, and biological weapons. High-strength materials such as reinforced concrete and steel plates can be chosen for construction. The walls should not only meet defensive requirements but also ideally possess offensive capabilities.

3. Spatial Planning: The shelter should have a reasonable spatial plan, including living areas, storage areas, medical areas, laboratories, gyms, etc. To ensure that people can live in the shelter for an extended period of time, there needs to be sufficient reserves of daily necessities, such as food, water, clothing, and fuel.

4. Life Support System: The shelter needs to be equipped with air purification, temperature control, and drainage systems to ensure the survival of people in the enclosed environment. In addition, a power supply needs to be considered, and backup power sources such as generators and solar panels can be installed.

5. Communication Equipment: To maintain contact with the outside world, the shelter needs to be equipped with communication equipment such as radios and satellite phones. Navigation equipment, such as maps, compasses, and GPS, is also required for evacuation if necessary.

6. Defensive Facilities: To counter external threats, shelters need to be equipped with defensive facilities such as surveillance cameras, alarm systems, and weapons caches. Additionally, traps and obstacles can be placed to increase the difficulty of an enemy attack.

7. Personnel Management: A comprehensive management system is needed within the shelter, including personnel division of labor, resource allocation, and sanitation management. To ensure order and safety within the shelter, dedicated security and management personnel are required.

8. Emergency Response Plan: To cope with various possible emergencies, the shelter needs to develop detailed emergency response plans, including those for fires, epidemics, riots, etc. Regular emergency drills should also be conducted to improve personnel's emergency response capabilities.

After listening to the system's introduction, Ye Lei gained a deeper understanding of the shelter and decided to build it here temporarily.

Because this place basically meets his requirements, he will hurry up and find the supplies and equipment that the shelter does not yet need.