Taishan Observation Station.

In the small space surrounded by the four guns, Bai Liu's behavior could be described as leisurely. He looked at Liu Jiayi and said, "Then you captured the clone Tang Erda and chose to come to Taishan Station to meet us. But since you didn't know if we were monsters, you decided to take the initiative?"

Bai Liu leaned back in his chair, opened his eyelids, spread his hands and chuckled: "Now that you have controlled us, what next? How do you decide to distinguish whether we are monsters or your real teammates?"

Liu Jiayi's lips were pursed into a thin straight line. She twisted the gun in her hand and tightened her grip. The pair of inappropriately large gloves on her palms were taken off by Bai Liu and given to her.

But the gloves no longer had any residual body temperature left, and her fingertips were so cold that they felt numb.

"I can tell the difference between you and the monster." Liu Jiayi's breath brought out a puff of white mist.

The little girl's gray eyes shot towards Bai Liu's cheek through the hazy goggles, with a threatening and cold feeling, but this cold feeling softened involuntarily when Bai Liu's calm eyes met hers.

She seemed unable to articulate the cruel method, even though she had successfully used it twice.

So Bai Liu sympathetically said for him: "Monsters have weaknesses. You can use these weaknesses to distinguish us from them. Earlier at Edmund Observatory, you burned [Mu Sicheng] to death with fuel oil and poison. After confirming that this was their weakness, you quickly used the same formula to mold [Tang Erda]."

"[Tang Erda] is a monster that is afraid of these things, so it was captured as you wished." Bai Liu raised his eyes and looked directly at Liu Jiayi, "But [Bai Liu], I guess it was not released because it was cunning, right?"

As Bai Liu spoke, he grasped the muzzle of Liu Jiayi's gun with his gloved hand, pressed his chest against it, and stood up slowly.

He pushed her back a few steps, looking down at her with pity: "Jia Yi, you can't do anything to Bai Liu."

Liu Jiayi couldn't use such a cruel method to test Bai Liu's authenticity, so she let that "Bai Liu" go - even though she knew there was a 99% chance that this "Bai Liu" was a monster.

But what if it isn't?

She didn't want to kill him, but she did it this way.

Not to mention Mu Ke. If this guy can use his knife to hurt any monster with a white willow face, he will be the first to cry.

Liu Jiayi's lips turned blue. She looked up and stared at Bai Liu for more than ten seconds. She took a deep breath, put away her gun, and took out the poison: "Yes, you said the same thing to me last time, so get out of here. I have to identify the other two people."

"No need to test, we are both real." Bai Liu smiled, "I am sure that I am the real Bai Liu, so you are also the real Liu Jiayi."

Liu Jiayi raised her head in astonishment: "How did you recognize it?!"

Bai Liu patted her head: "This is a controlled experiment. We have already heard the observatory version."

Liu Jiayi frowned: "What experiment?"

Bai Liu described the experiment that Xiao Xiao and his team had conducted, then smiled with great interest:

"Don't you think it's very similar to our current situation? It's a group of people who are familiar with each other. One of them goes their separate ways and then turns back halfway, while the other stays behind to wait for rescue. Then the two sides identify each other as human beings?"

After Bai Liu said this, Mu Sicheng touched his chin, put down his gun and thought deeply: "...It seems so."

Then he was startled, as if he suddenly realized something, and retorted loudly: "No, according to this experiment, some of us should be real and some should be fake!"

"No, no, no." Bai Liu suppressed the alert Mu Sicheng and raised the gun aimed at Liu Jiayi's forehead again, explaining with a smile, "This time it's an experiment where one side is all real and the other side is all fake."

Mu Sicheng was confused: "Why?!"

Liu Jiayi couldn't help rolling her eyes. She took the lead in putting away the poison and muttered in a low voice: "Idiot, and a college student?"

Mu Ke also put down his gun, leaned his head on the top and took a long, tired breath, his hands drooping, and turned to explain to Mu Sicheng:

"If, as Bai Liu said, this is a social experiment with very low reproducibility, then it is common sense that an experiment that has been done will not be conducted a second time, because they have already obtained the experimental results of Fang Xiaoxiao's situation, and Fang Xiaoxiao's situation will not be repeated in our body a second time. We have to play another experimental role."

Bai Liu raised his finger, his smile deepening. "Simply put, we are the control group of Fang Xiaoxiao's experiment. Based on this inference, we can then draw the conclusion that because we are real, Mu Ke and the others who came to see us must also be real."

Mu Sicheng's eyes were full of stars, and his eyes were spinning: "...What the hell is going on? How can you draw such a conclusion directly..."

Liu Jiayi glanced at Mu Sicheng and gave him a hopeless look in silence. She turned around, yawned, opened her bunk, took off her bloodstained coat, curled up into a ball on the bunk lazily, and shouted, "I'm going to sleep."

After saying that, Liu Jiayi closed her eyes, clenched her hands into a ball, and tightly grasped Bai Liu's gloves, just like a cub who had finally found its correct nest. She breathed evenly and soon fell asleep.

Mu Ke half-blocked in front of the bed, lowered his voice, and explained: "Jia Yi has been using poison to deal with monsters all the way here. Although she has physical recovery potion, she is a child after all, and she is still very tired mentally."

Tang Er glanced at the bloodstains all over Mu Ke's body and the tired and weathered expression on his face, and he knew that this man was reading a book to process memory data, and then he forced Liu Jiayi to fight his way out of a bunch of monsters, which also consumed a lot of energy.

"You should take a rest too." Tang Er opened his mouth to comfort her.

Mu Ke nodded, turned around and took off her clothes gracefully, climbed onto the upper bunk and straightened the corners of the quilt, but she fell asleep within a minute of lying down, with her hands hanging down from the edge of the bed.

Tang Er sighed, stepped forward and put Mu Ke's hand back: "It seems that they really went through a fierce battle to deliver the letter to us. It's hard for them."

Mu Sicheng was so anxious that he circled around Bai Liu, pointed at the two people on the bed and asked in a low voice: "How can you be sure that these two guys are not monsters?!"

They didn't burn them, nor did they pour strong acid on them. The only weaknesses that could distinguish players from monsters were all useless. Just one look and I was sure what the Bai Liu gang was up to!

Bai Liu smiled: "Are you really that curious?"

Mu Sicheng nodded frantically.

Bai Liu took out a piece of paper and a pen, placed them on a small desk in the middle of the cabin, and leaned forward to explain to Mu Sicheng: "Do you remember the experiment Fang Xiaoxiao told you about before?"

"Remember." Mu Sicheng wanted to rub the goose bumps on his arms when he thought of the experiment, "It was that a group of them let a few people escape from the ice crack outside Taishan Station, and then these people turned back to rescue them, but they met fake ones, and one of them didn't recognize them."

Bai Liu lowered his eyes: "What do you think the purpose of this experiment is?"

Mu Sicheng was stunned for a moment, then racked his brains to think, and tentatively gave an answer: "It should be... to explore how humans in the same community can distinguish between monsters and humans in extreme environments?"

He remembered that Fang Xiaoxiao said this to him.

"In other words, this is an experiment to explore the ability of humans within a group to distinguish between the same and different kinds." Bai Liu wrote down the four subscript letters [A1], [A2], [B1], and [B2] on the paper, and then continued writing.

"Let's assume we are monsters. A is the human group. A1 and A2 are two groups of people in a group that we forced to separate. B is the monster group. [B1] and [B2] are the images of [A1] and [A2] mixed into the creatures as simulated by the monsters."

Bai Liu listed the four letters in a 2×2 table: "Then according to our experimental purpose, there are four exploratory experiments to be conducted. A1 meets B2, and A2 meets B1. These two are the experiments that Fang Xiaoxiao and his team have conducted."

"Since the human group A1 that had undergone the experiment had memories of the identification experiment, and the human group A2 could not bear the results of the experiment and committed suicide, we could not conduct the experiment on them again, so we needed a completely new human group that had not had contact with other groups to complete the remaining two experiments."

Bai Liu slowly raised his head and looked directly at Mu Sicheng: "That is, the two comparative experiments of A1 meeting A2 and B1 meeting B2 - this is the experiment we conducted."

"So I say, if we are real, then Mu Ke must be real."

"Of course, judging from the current situation, we cannot rule out the possibility that we are all fake. I now suspect that the experiments of this group of monsters involve the level of memory."

Although he made such a horrifying guess, Bai Liu's tone was incredibly calm: "But even if both sides are false, to me, it is no different from reality."

Mu Sicheng took two steps back. He looked at the four experiments listed by Bai Liu on the white paper with horror, and couldn't help feeling a chill seeping into his bones.

This kind of cold was even colder than when they were walking in the snow at minus fifty-five degrees Celsius - it was a pure, cruel cold that made them feel like they had lost their emotional cognition and identity as human beings.

It was as if he was no different from any other creature in the world, just a pile of bones, connective tissue, some orderly arranged fat, and an organism wrapped in skin, allowing something higher than himself to toy with him at will.

Just as humans have done to other living things, life has been stripped of its value and reduced to mere meaningless symbols on paper - A1, A2, B1, B2.

Mu Sicheng's lips were trembling. He was uneasy and looked at Bai Liu helplessly: "What if we are fake?"

Bai Liu looked at him calmly: "Of course, kill the real one and replace him."

The author has something to say:

Now that we have eliminated two incorrect answers, C and D, please continue to choose between A and B.