Chapter 289: Who Knows How This Theorem Came About, Feels Like It's Out Selling Itself

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Ding Sihan and Qu Wanqiu had also arrived. Chen Yuying was the latest to arrive today.

"How ‍‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‍come you two came together?" Ding Sihan narrowed her eyes, turning into a melon-eating badger.

NovelFire reader preview #aa8707262360 (issued 2026-07-17).

(Translator's Note: "Melon-eating badger" refers to someone who loves gossip, derived from Lu Xun's story "Hometown").

"Just happened to meet downstairs." Lin Li answered.

"Don't believe it." Ding Sihan snorted coldly.

"Just happened to meet downstairs." Chen Yuying also answered.

"Oh, oh, I see." Ding Sihan nodded.

Lin Li: "?"

This badger really needs Runtu.

(Translator's Note: Runtu is the character who stabs the badger in Lu Xun's story).

While taking out his school supplies and arranging them on the desk, Lin Li looked up at Ding Sihan opposite him and asked:

"Little Dingding, what are we eating for lunch today, have you chosen?"

"Aren't you treating today? Defaulting to me picking the restaurant? Aren't you going to choose yourself?" Ding Sihan asked back upon hearing this.

Today was considered a thank you for the surprise on his birthday, so Lin Li was paying for both lunch and dinner.

Lin Li requested it himself.

He originally planned to find a place to play and relax, but considering they had to prepare for exams, he decided against it. He would make up for it when there was a chance later.

Hearing Ding Sihan say this, Lin Li nodded: "Okay, then let's go eat shit together. Bufan introduced me to a newly opened toilet nearby, it's packed with people."

Expressing his feelings directly.

"Get lost, get lost, get lost, I'll choose. You guy, at least say Shaxian Snacks!"

Facing the little glutton Lin Li, Ding Sihan and Qu Wanqiu were stunned at first, then pressed their fists against their foreheads, couldn't help shaking their heads and complaining.

Spending too much time with Bai Bufan, sure enough, habits are contagious.

"I didn't introduce it, I usually go to the old one!" Bai Bufan was also indignant.

"Then I'll introduce this one to you next time."

"Okay, thanks."

"What's the budget?" Not participating in the wise topic of these two retards, Ding Sihan asked Lin Li.

"Depends on whether you guys have any shame. If you don't, there's no upper limit." Lin Li said casually.

"Understood."

"Sort by price, from high to low..."

"There's actually only one Michelin restaurant in Xiling? And it's so far? We'll have to pay for the taxi ourselves."

"This half-head abalone actually costs eleven to thirteen thousand each. How about we each get one to try? But to save Lin Li some money, we'll eat slightly lower quality, the eleven thousand tier is fine."

"..."

Ding Sihan and Qu Wanqiu muttered to each other opposite him, full of enthusiasm.

Lin Li smiled.

Is the budget already sixty thousand?

"Lin Li, where are you going?" Ding Sihan looked at Lin Li getting up and asked in confusion.

"Going to the toilet."

"Then why did you take all your things?"

"Of course it's because Confucius said 'learning without shitting is vain, shitting without learning is perilous', so shitting and learning need to be combined. It's not that I plan to run away home and delete all of you. How is that possible, I couldn't do such a thing." Lin Li said innocently.

"Alright, roll back here. I just picked a restaurant recommended online, it's only about forty-something per person." Listening to this long and difficult sentence, Ding Sihan nodded with a satisfied smile and showed her phone.

Lin Li of course knew Ding Sihan was joking just now, but he still cooperated by letting out a long breath and sitting back down.

It was only eleven o'clock now. Although Ding, Qu, and Bai probably hadn't eaten breakfast yet, there was no need to go to lunch so early.

So after the joke, everyone quickly entered the study phase.

Carrying the expectations of Wang Yuezhi and Chen Yuying, Lin Li had a reason he couldn't lose!

"You're listening to driving school online classes while studying? Can you even study like this?"

Bai Bufan was just about to ask Lin Li a question when he noticed Lin Li's current situation and asked in surprise.

Lin Li was wearing one earphone, with test papers in front of him, but in front of the test papers, there was also a phone standing up, playing a video.

"Why wouldn't I be able to study? Just study normally." Lin Li shrugged.

The sound in the earphone was actually very low. Lin Li only needed to take a picture of his ID card with his phone when the prompt for taking a picture to clock in popped up.

"I admire people who can multitask. I don't even dare to listen to music when I study.

"Fuck, last time when the homework required writing about the Six Gentlemen of the Hundred Days' Reform, my earphones were playing TNT's 'We Like You', and as a result, I wrote Ma Jiaqi and Ding Chengxin.

"Sigh, at that time in the office, the first thing Sister Zhen asked me was 'Didn't you notice there's one extra person'."

"There are five of the Four Heavenly Kings, this is common sense. Didn't you tell the history teacher?" Lin Li teased with a smile.

The phone popped up a detection prompt. He picked up his ID card and smiled at it.

Detection passed, online class continued.

"Hey, Lin Li, why does the photo on your ID card look so immature." Bai Bufan reached out and snatched the ID card after it was over, looking at Lin Li's avatar on it and teasing, "Doesn't look like you now at all."

"Taken three years ago, of course it doesn't look like me." Lin Li answered nonchalantly.

Boys also change a lot as they grow up.

"Let me see too." Ding Sihan reached out curiously.

"But this ID card of yours looks exactly like someone I know." After Lin Li nodded, Bai Bufan handed the ID card to Ding Sihan, while saying to Lin Li.

"Who?"

"My son."

Lin Li laughed. Everyone, just as he showed just now, Lin Li can multitask.

So Lin Li simultaneously lost his reason and calmness.

And Bai Bufan lost his pulse and breath.

...

Approaching noon.

The sunlight outside the study room had turned a rich orange-yellow, spilling into the study room through the gaps in the curtains, warm and cozy.

Unfortunately, despite this, Chen Yuying still refused to take off her windbreaker to let Lin Li see more of her curves.

Xiling was still too far from North Korea, the sun's shining wasn't intense enough.

North Korea, bad!

"Almost time, eat?" Ding Sihan, who had finished reviewing one class hour, raised her hands and let out a soft moan, checked the time, and looked up to ask everyone.

"Sure."

"Let's go."

Everyone nodded, but Bai Bufan was focused, writing rapidly on the paper like dragons and snakes. Hearing the voices, he just slightly raised his left hand without looking up and said "Wait a minute".

Then he immediately put it down and continued pressing on the scratch paper, his face becoming more and more excited.

"No rush, take your time."

Seeing this, Lin Li sat back down, opened his water cup, and started drinking.

This kind of 'Zone' state in studying is also something you can only encounter by chance, not seek. Looking at it, sure enough, he was doing math problems.

And at this time, as long as he solved it, the benefits for Bai Bufan would be great.

Bai Bufan didn't disappoint Lin Li. The next second, he stood up excitedly, slapped his pen heavily on the scratch paper, and said excitedly:

"I proved it! Yes! I proved it!"

"Evil creature, what did you prove?"

"The Pythagorean theorem is wrong!"

"Not bad, pfft—" Lin Li's thumb was already up, but the next second, after confirming what he heard, he instantly spat out the water.

Fortunately, he was facing Bai Bufan, not the girls.

Bai Bufan's excitement came to an abrupt end. Wiping the water off his face, he looked coldly at Lin Li.

Molested.

But Lin Li didn't have time to care about this now. He pointed at Bai Bufan, his face full of disbelief: "What did you just say? What did you prove is wrong?"

And Bai Bufan, who was originally preparing to question Lin Li, didn't care about the water on his face upon hearing this. After taking the tissue Chen Yuying handed him and wiping it casually a few times, he excitedly showed his scratch paper to the four people present.

Making a solemn declaration—

"The Pythagorean theorem really might not hold true!"

"I know you guys might not believe it, but listen to my detailed explanation!"

"Come, follow my rhythm, let's use proof by contradiction. First, we assume a+b=c is correct. abc are just algebraic letters and can be set arbitrarily. So, for your convenience in understanding, we write it as x+y=z.

"Eh, smart people like you should see it by now."

"See what?"

"Sigh, stupid!

"Then I have to continue revealing it. Look! The left side x+y is a quadratic equation with two unknowns, while the right side z is a quadratic equation with one unknown.

"Two unknowns quadratic is also one unknown linear, and one unknown quadratic linear only costs fifty cents.

"This price difference is double, everyone. This is obviously unequal, so the assumption does not hold, which means the Pythagorean theorem is incorrect!"

(Translator's Note: A series of untranslatable puns on mathematical terms and Chinese slang. "Er yuan er ci" (quadratic equation with two unknowns) sounds like "two yuan two times". "Yi yuan yi ci" (linear equation with one unknown) sounds like "one yuan one time". "Yi yuan er ci" (quadratic equation with one unknown) sounds like "one yuan two times". "Yi ci" (one time) sounds like "fifty cents").

Because the entire proof was thought out by his own brain, Bai Bufan explained it very smoothly and fluently.

Ding Sihan, Chen Yuying, Qu Wanqiu: "?"

What fifty cents?

What did we just hear?

Bai Bufan shook his head. His shocking discovery had indeed completely stunned Lin, Ding, Qu, and Chen. They just stared at the formula on his scratch paper, unable to say a word.

Understandable.

After all, his discovery was too great.

The first to react was Lin Li. He covered his mouth, his expression somewhat horrified: "Fuck, so that's how it is..."

Ding Sihan, Chen Yuying, Qu Wanqiu: "?"

No... you?

Lin Li then sighed, muttering with increasing resentment and regret:

"Damn it, I even recommended the Pythagorean theorem to my friends before. I didn't expect it to actually collapse. Everyone remember to avoid it in the future. Old Jian is also doing a lot of harm, how can he accept any commercial order, teaching any kind of knowledge..."

"Um... I think, actually, it's quite normal for it to collapse. When I learned it in junior high, I felt this theorem wasn't decent. What kind of theorem talks about 'gou' (hooking up) and 'gu' (thighs)? It feels like it only got popular by being edgy."

(Translator's Note: "Gou" and "gu" are the Chinese terms for the shorter and longer legs of a right triangle, but also have other meanings).

Ding Sihan took a deep breath, nodded, and agreed.

Chen Yuying and Qu Wanqiu abruptly turned their heads: "??"

No... how come you too?

"Not only that, my research results aren't over yet. Everyone, I just calculated the specific value of π."

"Oh, there's more?"

"Come, look, π = 兀 = 一 + 儿. And Binbin taught us that the retroflex ending 'er' has no actual meaning, which means π = 一 = 1!"

(Translator's Note: A visual pun on the Chinese character 兀 (wu), which looks like π, and is composed of 一 (one) and 儿 (son/retroflex ending)).

The great mathematician Bai Bufan wouldn't stop here. He continued to flip out his previous scratch paper and popularized science to the few people.

"Fuck! Bai Bufan, you're a fucking genius!" Lin Li was simply a perfect straight man, chiming in with cadence:

"Humanity will never be troubled by memorizing pi again! One less dark cloud over the building of mathematics! Bai Bufan, you're fucking Gauss's brother, a piece of big shit!"

(Translator's Note: "Da gou si" (big dog shit) sounds like Gauss).

It seems comprehensive development is necessary. If those mathematicians in the past had studied Chinese well, they would have calculated π long ago.

Ding Sihan also nodded in gratification: "One small step for Bai Bufan, humanity marching in place."

"You flatter me, you flatter me."

The atmosphere in the study room was harmonious, proceeding with mutual business praise and modesty.

And Chen Yuying and Qu Wanqiu exchanged a glance.

For some reason, it felt like among the people present, the two of them were the abnormal ones.

So we are the ones who are sick?

Not confident, let's observe a bit more.

"Wanqiu, don't join them, I beg you." The pitiful Yingbao held Qu Wanqiu's hand and pleaded.

"Don't worry, I still can't quite keep up. I'm still not sick enough." Qu Wanqiu patted the back of Chen Yuying's hand and nodded regretfully.

"Bufan, are you interested in volunteering to teach in a mountain village during the winter and summer vacations? I feel like you can teach the children in the mountains into the jungle."

Lin Li put his arm around Bai Bufan's shoulder, treating him as an outstanding talent of the nation—

"Bufan, the country needs a teacher like you!"

"Pfft—fuck—" Bai Bufan still wanted to keep a straight face, but Lin Li's two sentences completely broke him, so he laughed out loud.

And at this time, Lin Li stopped acting too. He instantly changed his face, directly delivering a side kick to Bai Bufan's butt, laughing and scolding:

"Fucking retard, Bai Bufan, what the fuck were you studying all morning? Is this how proof by contradiction is used? Proof by contradiction = anyway it doesn't hold true, right?"

(Translator's Note: "Fan zheng" (proof by contradiction) sounds like "fan zheng" (anyway)).

"Just tell me if it's right or not?"

"Since the equation is already fifty cents a time, what else can I say? I'll just humor you."

"Hahaha, no helping it, fuck. When doing math problems, once my thoughts wander, it becomes like this." Bai Bufan himself finally couldn't hold it in either, finding it funny and responding.

"Alright, let's go, time to eat."

"Let's go."

...

The five of them still took two taxis to the restaurant Ding Sihan sent in the group chat. Lin Li and Bai Bufan arrived first.

It could be seen that it was a restaurant with really good reviews, because it was full of people inside, and there were two people sitting on the chairs placed on the street outside, probably waiting in line.

But Ding Sihan said she had already made a reservation, so Lin Li still walked straight in.

"Hello, the seats are full right now, you need to wait in line."

"We have a reservation, Ms. Ding called."

"Oh, oh, I remember, we kept it for you. Could you please go to that table first? The table hasn't been wiped yet, please wait a moment." The receptionist pointed to an empty table that hadn't been cleaned up yet and said apologetically.

The two of them had no objections and walked to this seat by the half-floor-to-ceiling window.

"There are only four chairs." Bai Bufan pointed at the number of chairs and greeted.

"I have a plan. This chair thing can only seat one person when placed upright, but if placed upside down, the four chair legs can seat four people. We two sit on one, and the three of them sit on three, how about that?" Lin Li always had a lot of ideas.

"Get lost!" Bai Bufan covered his butt, which sounded painful just hearing it, and laughed and scolded, "If you want to torture yourself, don't torture me. Just ask the waiter for another one."

Bai Bufan waved to the waiter to greet them, but they seemed a bit too busy and didn't respond for the time being.

"Do it yourself, and you'll have plenty of food and clothing." Lin Li got up.

"Hello beauty, are you here to eat alone?"

Hearing such a cheesy and greasy pick-up line, the woman sitting at the long single-sided table against the wall frowned and turned her head.

The moment she saw Lin Li's face, her brows immediately relaxed.

Remember, a handsome guy hitting on you is a beautiful encounter; an ugly guy hitting on you is goblin sexual harassment.

Especially since Lin Li looked very young, a fresh meat.

Her type.

"Ah, yes, just me alone." The woman smoothed her hair somewhat shyly, already reaching out to open WeChat and clicking on her QR code.

Her shyness came to an abrupt end when she saw Lin Li immediately say "thank you" happily and then take away the empty chair next to her.

Eh?

Looking at Lin Li's briskly departing back, the woman slowly typed a question mark.

You fucking weren't hitting on me!

"Pingping, I'm back. Eh, where's my chair?" Her best friend came back from the toilet, looked at the empty floor, and was stunned.

When the woman noticed that Lin Li also looked over after hearing her best friend's voice, and stood up again, seemingly hesitating whether to return the chair he just took...

Now she wasn't typing a question mark, but a three-bedroom apartment.

So awkward it gave me goosebumps.

Instantly, she chose to get up, grabbed her best friend, and walked out, while lowering her voice and pleading: "Let's go! Let's go! Let's eat at another restaurant!"

"Ah? Why?"

"Don't ask yet! Let's go, let's go first! I beg you!"

Best friend: "?"

...

"Should I not have taken this chair?" Lin Li asked Bai Bufan.

"It doesn't matter anymore, anyway, they've already left now." Bai Bufan said with a smile.

Soon, the taxi Chen Yuying and the others took also arrived.

The five people were all present, and the table had long been cleaned up, so they scanned the code to order.

"Smack."

The hand Bai Bufan reached out was hit red by Lin Li's chopsticks.

"You guy, forgot the rules again." Lin Li said coldly.

"No, what did I do?" Bai Bufan looked confused.

"Don't you understand the principle of the phone eating first?" Lin Li lifted his chin.

"Oh, oh, my bad."

Bai Bufan hadn't really gone out with girls his age, the last time was with this group, so it was perfectly normal to forget.

"Just 'oh oh my bad' and it's over? Bai Bufan, what exactly is your attitude?" Lin Li, who also couldn't use his chopsticks and had no interest in taking pictures, still refused to let Bai Bufan off, questioning coldly:

"When we had no food to eat, who found the restaurant for us? Bai Bufan! When we had no money to pay the bill, who paid for us!! The phone pays for us and navigates for us, and you start eating first?

"And you have this attitude after being scolded by me? Really, you have no respect for your elders!"

Bai Bufan: "..."

Your mom.

Are you elevating it to this level?

But Bai Bufan immediately bowed slightly to Lin Li, apologizing solemnly and heavily: "I'm sorry, I know I was wrong. Do you have the phone's TikTok account? I want to write a short essay to thank it."

"It hasn't opened a TikTok account yet, but I have its payment code. You can just transfer the money directly to it, here." Lin Li opened his payment code, showed it to Bai Bufan, and signaled that he could start thanking.

Bai Bufan: "?"

"This is fucking your payment code!"

"It's the phone's."

"..."

The three girls laughed crisply, but after being disturbed by these two, they didn't plan to continue taking pictures either.

"Alright, alright, no more pictures, let's start eating." Chen Yuying said with a smile.

"Bufan, you can use your chopsticks now. You were very good today, rewarding you with the first bite."

"Thank... wait, why does it always feel like you're training a dog?"

"Remove 'why does it always feel like', mhm."

(End of Chapter)