Who would study psychology if they didn't have some kind of problem?

Chapter 74: The Kill Line Has Been Reached
He glared fiercely at Chen Ting below the podium, then turned to look at Nan Zhuren.

"This is a perfect opportunity for me to witness Professor Nan's remarkable skills—how should we begin?"

Nan Zhuren smiled and said, "Don't rush."

"Let's start with a little game."

Nan Zhuren turned to look at the students.

"All of you here are top law students, and you may become lawyers or legal advisors in the future. Because legal consultations involve the privacy of clients, they often hide some key information, even necessary information, which can ultimately lead to disastrous consequences."

The students nodded in agreement, and even Wang An couldn't help but silently agree.

Legal novices are often misled by clients, and even some seasoned legal professionals can be caught off guard by clients' lies.

"Therefore, I think everyone needs to learn some simple lie detection techniques. Let's start with the simple ones."

Nan Zhuren turned to Wang An and said, "Next, I need Teacher Wang's cooperation to demonstrate to the students."

Wang An perked up: "How do we do it?"

Nan Zhuren smiled and said, "Relax. I'm going to ask Teacher Wang three questions. Please don't lie to me."

Wang An nodded, ready for battle.

Nan Zhuren paused, giving his opponent ample time to prepare, before asking, "I would like to ask Teacher Wang—your gender?"

Wang An felt he had misplaced his seriousness, laughed absurdly, and replied, "Male."

"How old are you?"

"30 is old."

"Your major?"

"Law".

Nan Zhuren encouraged loudly, "Very good, we have now completed the first stage."

The students were puzzled, but they still applauded in response.

Nan Zhuren carefully observed Wang An's expression, establishing a baseline for when Wang An was "telling the truth." He had collected this information beforehand, and he was absolutely certain that every detail on Wang An's face was indeed "the expression when telling the truth," without worrying about polluting the database.

Hearing the students' applause, Wang An breathed a slight sigh of relief: That's it? It's like playing a game.

He was already exhausted, but he unconsciously relaxed a little more.

"Okay, then I'm going to ask Teacher Wang three questions. Next—you must lie to me."

Wang An relaxed a bit more; lying was easier than telling the truth.

"Teacher Wang, what did you eat this morning?"

"Steak, pasta, orange juice."

There was no need to recall this question; Wang An simply made up a story.

What's your favorite type of clothing?

"sweater."

When faced with this question, Wang An first subconsciously recalled what he really liked most, then ruled it out, and finally fabricated a wrong answer.

What's the thing you're most proud of?

"Ha... I ran into a world champion at the swimming pool one day, and then I beat him in freestyle!"

This question has less time for recollection and more time for fabrication.

Nan Zhuren gradually incorporated Wang An's facial expressions as he spoke into his database.

Wang An was very relaxed at this moment and even joked: "Of course, I do go to the swimming pool often, so the first part of that sentence is true—it's okay, right?"

The students got the joke and laughed along.

"Of course it's okay, it's even better this way."

Nan Zhuren laughed as well, and casually added Wang An's relaxed expression to his database. Although he thought Wang An might not be able to make that expression again.

"Great, can we do it again?"

“Of course,” Wang An replied easily.

"Now I want you to tell me the truth three more times."

"..."

"Then came three more lies."

"..."

The game was repeated.

Wang An became increasingly relaxed because of this "game".

The students' attention became increasingly focused, their curiosity fully aroused, and they wanted to know what Nan Zhuren would do next.

And Nan Zhuren obtained everything he needed.

Preparation is complete.

Nan Zhuren turned around and explained to the students:
"I don't know if everyone is interested in psychological knowledge such as lie detection, or if you have read some related tidbits—such as when people lie, their eyes will avoid eye contact, or their eyes will glance to the left or lower left, and especially when boys lie, they will like to touch their nose."

"I'm telling you—it's all fake. If you believe it, you might get scammed even more badly!"

The students laughed.

Nan Zhuren continued to patiently guide him: "The correct method is like what I just did, to record a person's reaction when they tell the truth and when they lie, and then use that as a basis to judge whether the person will be sincere in the future."

"Everyone reacts differently when they lie, and these reactions are determined by their environment, cultural background, upbringing, and so on."

Nan Zhuren turned around and, without realizing it, walked to the position where his back was to the students and sat down directly on the table.

This action turned Wang An towards the students, exposing his head to their view.

This allows his expression to be fully revealed.

Nan Zhuren exclaimed in admiration, "I must say I admire him. As a legal professional, Professor Wang An must have received special training before. He has very little facial reaction when he lies, and he doesn't show any big expressions."

"I must say, Teacher Wang is a master liar."

The students laughed; they thought Nan Zhuren had told a good joke.

Wang An's smile froze slightly.

"Even so, I still found Professor Wang An's facial expression code: when he lies, his eyes will deliberately freeze for a few seconds."

"The head will involuntarily move up and down, as if making a slight nod."

"If you're going to tell a long lie, there will be one or two swallowing motions."

"Of course, these are things you can observe together; there are many more subtle expressions that I won't mention now, since you can't see them anyway."

Nan Zhuren immediately suppressed all her smiles and fluctuating emotions: "In short, Teacher Wang—you can't tell me any lies now."

Nan Zhuren changed too quickly, as if she suddenly had a completely different face.

The students thought Nan Zhuren was deliberately being silly and laughed again.

Wang An's entire body began to tense up.

[Impossible. Lie detection is pseudoscience; even professional machines can't detect it.]

No, no...

"Next, I'm going to ask Teacher Wang a few questions. I'll judge for myself whether you're lying, okay?"

Nan Zhuren looked at Wang An.

The entire class of students below the stage were also looking at Wang An.

(End of this chapter)