"The new students are new, this year's freshmen are very good, the student named Mu Sheng, I like it very much. Meng Shan said to the assistant principal in the principal's office.

Today is the first day of school for new students, the students wear uniform uniforms, come to class early in the morning, the principal Meng Shan looked at the bustling figure of the students outside the window, and remembered his young self.

"Yes, Mu Sheng is very good, much like you when you were younger. The assistant principal is called "Luo Yan", is an artificial intelligence, she has short black hair, glasses, delicate skin, and her figure is a masterpiece, Luo Yan is also one of the founders of the three factions, is the assistant to the previous principals, with deep qualifications, and even surpasses the principal, Meng Shan is the seventh principal of Luo Yan's service, Luo Yan watched him turn white from a young man, sighed, and then said: "In the blink of an eye, you are also old, and now, the time in the prophecy is getting closer and closer! The future can only be entrusted to the newcomer." ”

Meng Shan's eyes were filled with tears, he stroked his long white hair, and laughed: "No! No one can escape time, but Luo Yan, you are eternally young!"

"For the old disrespect, can you compare with me? I'm an artificial intelligence!"

"If you say that, I really have a question I want to ask you, and this question has been bothering me all my life. ”

"What questions can still bother you?"

"Since it's an artificial intelligence, it shouldn't be limited by the physical body, but why does the artificial intelligence start to die after the new home is built?

"I guess no one in the world can answer your question, not even we know why. Immortality is a curse, though, and I'm envious of AI that can die. ”

"That's the most interesting part, if there's anything that causes the AI to have a lifespan, then why don't you, perhaps, you're the special one, there's a secret hidden in you, a secret that's enough to destroy the world. ”

Luo Yan smiled, amused by Meng Shan's serious expression: "The destruction of the world has come out, I think, only my mother can answer you this question!"

"Princess Mingxi, one of the original creators!" Meng Shan shook his head: "How long has Principal Xi been dead! ”

"You can't say that, if there is a god in this world, maybe you can meet her in heaven after you die, and your question will be answered, oh, by the way, by the way, thank Mother on my behalf. ”

Meng Shan was counted down by Luo Yan like this, and the two laughed together.

Countless memories came flooding up in laughter, Luo Yansi fell in love with her mother, and Meng Shan looked at the deep cosmic galaxy and sighed: "How good it would be, people meet old people after death! I haven't seen my old friends for a long time." ”

"Your old friend? You're old and confused again, have you forgotten that he's been reincarnated?"

"Oh, yes, the teacher used the reincarnation technique, according to the prophecy, my old friend should be in this class of freshmen. ”

"Is it Mu Sheng?"

"I think it's like him, in addition to his strong physical fitness, the aura is also very matched, but everything needs to be verified, this session must be kept an eye on, the teacher's reincarnation technique is not something that can be guessed at random. ”

At this time, in the opposite teaching building, a burst of excited shouts mixed with horror entered the principal's office, interrupting Mengshan's thoughts, and the students were learning the first lesson: opening their eyes.

When Meng Shan opened his eyes for the first time, he was also frightened, who would have thought that the demons in this world were so ugly, and their souls were so clear.

In the classroom, Teacher An Yu was in the first class, and gave each of the students a bottle of black dog blood, Zhan Xing picked it up and smelled it, there was a smell of blood, many students only stuck out their tongues and began to whisper, Teacher An Yu then took out a glassware with a yellow seal, and gently placed it on the lectern, which was empty, and took out a wooden bird cage, also with a yellow stripe, and a bird was locked in it, and the bird closed its eyes, quiet like a specimen.

Teacher An Yu turned around and wrote two words on the blackboard: refraction, and said to the students: "Demons and souls are also substances in the universe, just like us, they also have their own laws to follow, and have their own material characteristics, only by mastering these characteristics can we better understand them." ”

"But, teacher, does this have anything to do with blood? Can you take it away first?" A classmate directly interrupted Teacher An Yu and complained, Zhan Xing actually had the same question, this blood really smelled bad.

"This is not good, don't worry, students, we will use it later, if anyone still has doubts, it will be like this chalk. An Yu said with a smile, pinched the chalk in his hand into powder, and the classmates who had just complained all quietly quieted down, everyone didn't expect that the gentle An Yu teacher would be so strict, An Yu teacher saw that everyone was quiet, and said: "Students, does anyone know about refraction?"

Sister Mingyue raised her hand and said, "The direction of light propagation at the junction of two two mediums will change. ”

"Very good, what about the refractive index?" Teacher An Yu asked Mingyue again.

At this time, Zhan Xing remembered the physics magazine at home, which belonged to his father, and Zhan Xing also flipped through it when he was bored, and Zhan Xing replied: "It is the propagation ratio of light between vacuum and medium." ”

Teacher An Yu nodded, I like this kind of learning atmosphere, Zhan Xing finally came up with a head, some of the other students understand, and some listen in the clouds, after all, there are some overruns, and only a child like Mingyue who loves to learn will study.

"You have to remember these theories, if the refractive index is the same, the light cannot be deflected, and our naked eyes will not be able to see the edges of the object, just like the two people at the lectern, a soul and a demon, you can't see. After speaking, Teacher An Yu pointed to the lectern.

The students couldn't believe Teacher An Yu's words, are there really spirits and demons on the table? Everyone opened their eyes wide and still couldn't see, everyone began to mess up, and the students were still afraid.

It's just that Zhan Xing seems to have seen two weak black shadows, just like the one he saw at the door of his home on the day of graduation, Zhan Xing could feel two strange breaths, but Zhan Xing was not sure, after all, they were looming, and Zhan Xing had to quietly tell Mingyue, and Mingyue didn't understand the principle.

The two were wondering, Teacher An Yu had already stepped onto the podium: "Students, it's quiet", Teacher An Yu continued: "Soul, from the appearance of the refractive index of the same as the air, demons, originally animals, will integrate themselves into the surrounding environment is the survival instinct, since they have wisdom, demons can change the refractive index of skin and hair at will, in layman's terms, they are born with stealth." ”

The students don't seem to understand, but Teacher An Yu talks about stealth, and everyone understands it about the same.

"After research, we found that the black dog blood can analyze the light more delicately, and the use of black dog blood can see a wider area of light, so that the soul and the demon have nothing to hide, okay, students, now apply the blood to the eyelids, remember, only a small drop is needed, and no waste is required." ”

"But, teacher, don't you paint it? If there is really a demon, you can't see how to protect us. Mingyue asked a little worriedly before Tu, but in fact, Mingyue was asking for other timid classmates.

An Yu saw Mingyue's thoughts, this is a great love, An Yu is very glad that the school has recruited Mingyue, the light emitted by her body, like Haoyue, will guide people in the dark to the light, An Yu smiled and said: "Mingyue is still cautious, very sensible, very good, rest assured, the teacher is artificial intelligence, there is a drop of black dog blood in his eyes, and he can protect everyone at any time." Besides, these two are sealed, don't be afraid. ”

The classmates trembled and smeared with blood, although Zhan Xing could see the black shadow, but she wanted to see it more clearly, and she also painted it, the moment she opened her eyes, she was frightened by the exclamation of her classmates, Zhan Xing didn't have time to react, only to see a human-like soul standing on the podium with blue light and closed eyes, and a three-meter-tall huge bird-shaped demon, with godless bloodshot eyes, and a bloody mouth to eat everyone in front of him.

This is the first time Zhan Xing has clearly observed the soul and the demon, and he is really scared enough, it seems that the road of the demon hunter is still very long, and it is estimated that everyone will be haunted by nightmares at night.