Eighty-three cases, minus those in Haizhou City and the case Lu Chuan matched yesterday, still over seventy remain.

Each of these cases, in the year they occurred, could be said to have been sensational.

The solving of any case represents not only the resolution of that year's case but also the end of an era.

The miner murder case in Meishan from ten years ago is one of them.

Li Hong, who was an ordinary worker at the mine back then, was not so ordinary.

Li Hong's life is filled with challenges, suspicion, and misunderstanding.

Starting ten years ago, in the eyes of everyone at the Meishan Coal Mine, including his family, Li Hong embarked on a path of no return.

Complaining.

Since the restructuring of Meishan Coal Mine ten years ago and its acquisition by Meishan Mining Group, Li Hong transitioned from being an ordinary safety inspector to a constant whistleblower.

Meanwhile, Chen Hu, who was once his colleague, climbed step by step from a safety officer to becoming the most influential safety director at the mining site.

In any coal mining industry, the most important positions are not those involved in physical labor or marketing.

There's no worry about selling coal.

The most important posts at the mine are those related to safety supervision.

Chen Hu is now the most powerful safety director at the mine.

And today, the entire Meishan Coal Mine is engulfed in an atmosphere of nervous confusion.

"Have you heard? President Chen has been arrested?"

"Taken last night from the dinner table with the boss."

"They say it's related to the case from ten years ago..."

"Ten years ago... that Li Hong..."

During the ten years of Li Hong's complaints, the accused party was Meishan Mining Group. As the miners said, it was biting the hand that feeds you.

If it hadn't been for Chen Hu's protection all these years, Li Hong would have been dismissed long ago.

Now that Chen Hu has been arrested, Li Hong has also been brought in for questioning.

Meishan Criminal Investigation Team's interrogation room.

"Everything I reported is true. Back then, they did many illegal things to seize assets. Those who colluded with them in the mine were all promoted, and those of us who went against them ended up like me..."

Li Hong's statement provided crucial evidence for solving the case.

The evidence against Chen Hu for murder was irrefutable, but he did not kill out of personal vendetta.

"Back then, my superior asked me to forge a safety report, and he overheard it in the mine... I had to kill him..."

Behind Chen Hu's murder was a hidden mining accident from back then.

"The purpose was for the smooth acquisition by Meishan Mining Group..."

Faced with the verdict of death, Chen Hu confessed everything.

Among the people involved in the case, some have already retired, while others now hold high positions.

The Meishan Criminal Investigation Team is going to be busy.

In the fingerprint battle conference room, Lu Chuan naturally didn't know the Meishan Criminal Investigation Team hadn't slept all night. Now Lu Chuan was selecting the fifth case.

Actually, there's nothing special about the selection. Lu Chuan was still choosing smudged fingerprints.

Because with these kinds of fingerprints, using mathematical methods and processing through a computer is relatively easier.

Eight years ago, a headless corpse case occurred in Yunfeng City.

By the time the body was discovered, it was extremely decomposed, presenting a condition known as the giant state.

The giant state is a late-stage change in a corpse; a highly decomposed body makes it difficult to accurately identify the victim's information.

At that time, fingerprint collection and DNA comparison failed to confirm the victim's identity.

However, the murder weapon used to kill the victim was left in the body; it was a fruit knife, from which a partial bloody fingerprint was extracted from the handle.

The head was severed with a sharp tool and was never found after the incident, and the site where the body was discovered was not the primary crime scene, yet the weapon was left inside the victim.

It's a very strange scene, with clues, and very direct ones, but no resolution was achieved after so many years.

Dragging the fingerprint into the PS software, Lu Chuan began processing it.

"Teacher Lu... what are you doing?"

This PS software is something almost everyone who works with fingerprints has used. Among the experts present, many are quite proficient with PS software.

But compared to Lu Chuan's operation, what everyone called proficiency seemed just rudimentary use?

Lu Chuan was performing image layering, but unlike usual image layering, Lu Chuan was using two-dimensional mathematical transformations.

By digitizing the fingerprint image and using formulas to differentiate the data from different coatings, the effect of layer separation is achieved.

"This way, the image layering is more thorough, getting to the root of the data, which is far better than the surface layering of the software itself; the resulting image is much clearer."

"Oh..."

A few behind him nodded in partial comprehension, while more furrowed their brows.

What is the root of the data?

Lu Chuan didn't hold back, explaining while doing data layering: "Here, we use a relatively simple sine function transformation, and then connect it with Fourier transform..."

Thus, as Lu Chuan's explanation deepened, fingerprint identification analysis gradually turned into a math class.

"Is this transformation definite?"

Zhao Zhigao voiced what most people were thinking: "Is there a pattern to it?"

Lu Chuan's hands paused on the keyboard.

"There is a certain pattern, but it mainly requires a high level of mathematical foundation from the user."

Lu Chuan used to do quite well in learning mathematics in the past.

However, compared to the mathematical skills within the advanced fingerprint identification analysis skills rewarded by the system, it's insignificant.

Most people can't even remember the names of several transformations, let alone use them.

Moreover, this usage isn't just like doing exam questions; it requires self-programming and analyzing undetermined variables on a computer.

This shifts from the examination stage to practical application.

It's not something most people can handle, not even mathematical experts.

Academic and practical applications are never the same thing.

Moreover, among the fingerprint identification experts present, many can't even remember the layout of the keys on the keyboard. Wanting to be like Lu Chuan...

It's extremely difficult.

Gradually, those who didn't understand simply left.

Everyone has their technical strengths; what's impossible to learn from others should better be spent researching one's own stuff.

"Ding!"

The pleasant notification sound rang, and Lu Chuan looked excited.

The screen displayed a successful match, acknowledging Lu Chuan's two-plus hours of work.

The murderer of the headless case in Yunfeng City, successfully matched!

The score and solved case number on the hero leaderboard were subsequently updated.

"Matched just like that?"

Zhang Tao clicked his tongue and poked his colleague next to him: "Old Li, your headless case is solved!"

Li Yunwei was studying a fingerprint about a third incomplete, immersed deeply in his work.

He felt just a little more, and he could crack it all at once.

However, just at the moment Li Yunwei felt he was about to rise to the occasion, he was poked.

He glared at Zhang Tao: "I was just about to get it! What are you doing?"

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