A perfect crime? To me, it's full of flaws!

Abandoned chemical plant in the north of the city.

A black AMG-G63 came to a stop on the bumpy dirt road, accompanied by a gust of wind. The tires rolled over puddles, splashing mud half a meter high.

Qi Feng pushed open the car door, his military boots sinking steadily into the dark red soil.

The air was filled with the pungent smell of sulfur and the sour stench of rotting weeds.

Ahead lay a stretch of abandoned factory buildings, rusty steel monsters lurking under the overcast sky.

Several collapsed brick kilns are scattered on the edge of the wasteland, covering a vast area with extremely complex terrain.

Qin An, accompanied by several criminal police officers from the municipal bureau, quickly got out of the car. His face was grim.

"Captain Qin, this place is too big." A young detective looked around, his tone helpless. "The abandoned factory buildings, the barren mountains behind them, and those small private brick factories—it's at least tens of thousands of square meters. How are we supposed to find it?"

Qin An didn't reply. He put on white gloves, squatted down by the muddy roadside, and carefully examined the ground.

The red earth was covered with paw prints of wild dogs and messy footprints left by scavengers, layer upon layer.

Qi Feng, with his hands in his pockets, slowly strolled over to Qin An's side.

"Senior Brother, if we keep searching like this, we won't find a single hair even by nightfall," Qi Feng yawned.

"Shut up and get to work." Qin An didn't even look up, carefully examining the map on his phone.

Qi Feng pursed his lips. He dropped his nonchalant expression and focused his attention.

The system skill "My Eyes Are the Ruler" is now available.

Qi Feng's vision instantly lost its color, and the whole world turned into a high-contrast black, white, and gray.

A few seconds later, several tiny red squares began to appear in the gray world. Only he could see these squares.

Following the directions, Qi Feng walked around a huge abandoned reactor, and a bright red box stopped in front of a patch of waist-high weeds.

Qi Feng walked straight over.

He squatted down.

The red frame precisely focuses on a broken blade of grass. At the break in the grass stem, a barely noticeable black fiber hangs.

"Senior Brother, bring the evidence bag over here," Qi Feng called out.

Qin An immediately got up and walked over quickly.

"Look here," Qi Feng said, pointing to the grass stem.

Qin An took out a flashlight and a magnifying glass and examined it closely. His eyes instantly sharpened.

"It's made of synthetic fibers. The fibers are highly consistent with those extracted from the windbreaker pillars at the amusement park." Qin An immediately used tweezers to put the fibers into an evidence bag.

He looked in the direction the grass stalks had fallen. Deep within the weeds, he could vaguely make out a path worn smooth by human feet. The soil had been turned over, revealing fresher, darker red earth beneath.

"The suspect has been here. And this is very likely his hideout." Qin An stood up, decisively took out his walkie-talkie, and said, "Calling command center. This is Qin An. Suspect's trail has been discovered at the abandoned chemical plant in the north of the city. Requesting immediate reinforcements from the SWAT team and the police dog squadron. Close all surrounding roads and conduct a thorough search immediately."

Putting down the walkie-talkie, Qin An looked at Qi Feng with a complicated expression: "You have a sharp eye, kid."

Qi Feng grinned and rubbed his fingers together: "Senior Brother, does this count as a meritorious service? How's the bonus? I'm the kind of person who's going to make a fortune and buy a seaside villa."

Qin An glared at him: "If the case is solved, I'll personally treat you to a big meal."

Half an hour later.

The piercing sound of sirens shattered the deathly silence of the chemical plant.

More than a dozen police cars and riot control vehicles roared into the open space. Hundreds of fully armed special police officers, accompanied by riot control dogs, quickly got out of their vehicles, set up a cordon, and began a grid search.

Liu Yuanshan and Lin Haitang also arrived at the scene.

"How's the situation?" Liu Yuanshan strode over.

"We found fibers from the suspect's clothing, which gave us a general idea of ​​the direction," Qin An said, pointing to the back mountain.

Qi Feng did not blindly advance with the main force. He walked on the flank of the search team, staring intently at the intermittent red outlines in his line of sight.

The red borders were small and widely spaced. Sometimes it was a patch of disturbed red soil, sometimes a slight scratch on a tree branch. The suspect's counter-surveillance skills were extremely strong, almost erasing all obvious traces.

However, the red box in the system represents an absolute rule.

Following this hidden clue, Qi Feng gradually deviated from the main factory area and headed towards a wasteland behind the chemical plant.

At the edge of the wasteland, there stood a moss-covered mound. Dense reeds surrounded it, completely obscuring the buildings inside.

The red boxes become denser here.

Qi Feng pushed aside the reeds that were as tall as a person. A dilapidated bungalow appeared in front of him.

Large sections of the wall plaster had peeled off, revealing the blackened red bricks underneath. A half-fallen wooden sign hung above the entrance, the words "Public Restroom" illegible.

Qi Feng stopped in his tracks.

In my line of sight, the entire bathroom door frame, windowsill, and even the vent in the corner were enveloped by a huge red square. The red was glaring, exuding a sense of oppressive death.

"Master! Eldest Brother! Bring people over here! The public toilet in the back mountain!" Qi Feng pressed his earpiece, his voice low.

Less than five minutes later, Liu Yuanshan and Qin An arrived with a team of special police officers.

"Are you sure this is the place?" Qin An drew his sidearm and gestured. Two SWAT officers immediately stepped forward with shields, standing in two rows on either side of the wooden door.

"It's pretty much a done deal." Qi Feng took two steps back, making room for him.

"Break down the door," Qin An ordered.

"Bang!"

The SWAT officer kicked open the rotten wooden door. The door collapsed with a crash, kicking up a cloud of dust.

There was no ambush. There was no movement of any living person.

But then, an extremely strong smell of disinfectant, mixed with a nauseating stench of stale blood, hit us like a tsunami.

Lin Haitang, standing behind, turned deathly pale and abruptly covered her mouth and nose.

Qi Feng went inside.

The space inside was surprisingly large. The original partitions had all been demolished, and the floor had been leveled with cement. In the very center stood a huge stainless steel table, two meters long and one meter wide.

There is a groove around the edge of the table, which connects to a plastic bucket below.

A row of iron hooks was nailed to the wall. They were covered with various tools: bone saws, boning knives, hammers, and large surgical scissors.

This is a slaughterhouse.

"Nluminol." Liu Yuanshan's voice was strained.

The trace evidence technician immediately stepped forward, drew the curtains, turned off the flashlight, and began spraying the reagent.

Two seconds later.

The entire room was illuminated by large swaths of eerie blue fluorescent light.

The metal table, walls, and ceiling were covered in splattered and smeared bloodstains. Layer upon layer, it was a shocking sight.

"The first crime scene." Qin An gritted his teeth and clenched his fists.

Qi Feng did not look at the fireflies.

His gaze was drawn to four large black plastic buckets in the corner. The red frame was fixed on those four buckets.

Qi Feng walked over, put on gloves, and lifted the lid of the first bucket.

It was filled with clothes.

A white dress, a pink cardigan, and jeans. The clothes were stained with dried, blackened blood.

On top of the clothes was a bloodstained employee ID card.

Qi Feng picked up the employee badge and wiped off the bloodstains.

"Chen Jing. The first victim." Qi Feng read out the name.

He opened the other three buckets one by one.

Wang Yue and Li Li's personal belongings and clothing were placed in the second and third buckets, respectively.

In the fourth bucket was a set of clothes belonging to the fourth victim, and a cell phone with its screen smashed.

The belongings of the four deceased were neatly categorized and placed. Even their underwear and coats were folded into squares.

"Pervert." Lin Haitang took a deep breath, forcibly suppressing the churning in her stomach.

"He used this place as his trophy display room." Liu Yuanshan's face was ashen. "The scene was cleaned very thoroughly. Apart from the bloodstains, there were almost no fingerprints or hairs to be found."

Just then, a crisp system notification sounded in Qi Feng's mind.

[Ding! Assisted in discovering the primary crime scene, experience points +100]

[Experience points meet the upgrade requirements; host level increased to LV2]

[Gained Skill Points: 1]

[Unlock new skill branch: Suspect Profiling (Beginner)]

Qi Feng was shocked. He had finally leveled up!

Without hesitation, he put one skill point into "Suspect Profiling".

[Suspect profiling upgraded to LV2]

In an instant, a flood of knowledge from criminal psychology, behavioral analysis, and micro-expression analysis rushed into Qi Feng's mind. His brain seemed to have turned into a high-speed, sophisticated computer.

He closed his eyes.

In my mind, the scene setup, the placement of tools, the classification of items, and even the concentration of disinfectant in the air were all transformed into data and began to be reorganized.

Ten seconds later, Qi Feng opened his eyes. His gaze had become calmer and more profound than ever before.

"The murderer is male. He is between 35 and 40 years old. He is 172 to 178 centimeters tall, with a strong physique and extremely strong core strength." Qi Feng suddenly spoke, his voice echoing in the empty room.

Everyone turned to look at him.

Qi Feng walked to the wall and pointed to the iron hooks for hanging tools: "The tools are hung at a height of about 1.55 meters above the ground. This is the most comfortable and fastest height for people who are 172 to 178 cm tall to reach them."

He walked to the metal table and pointed to its edge: "There are obvious friction marks on the edge of the table, concentrated on the left side. He tends to rely on his left side for support when he exerts force. He's left-handed."

Qi Feng turned around and looked at the four plastic buckets: "The clothes were neatly folded and arranged in order. There was an extremely strong smell of disinfectant at the scene. He would thoroughly clean up for hours after each crime. He has extremely severe obsessive-compulsive disorder and germaphobia."

"There's more." Qi Feng walked to a sewer opening in the corner and squatted down.

The red frame is locked onto the iron railing of the sewer.

Qi Feng used tweezers to pick out a small, white, whitish object from the gap in the iron fence.

"What is this?" Qin An walked over.

"Residue from medical bone wax." Qi Feng stood up, his gaze sharp as a knife. "He understands human anatomy, and his incisions are extremely precise. He's not an ordinary butcher; he's received professional medical training."

Qi Feng looked at Liu Yuanshan and Qin An.

"Master, Eldest Brother. Search among surgeons in major hospitals throughout the city, anatomy professors in medical schools, and morticians in funeral homes. Look for left-handed men who fit these characteristics and have a history of old injuries to their left leg."

The room was deathly silent.

Liu Yuanshan looked at Qi Feng, a hint of shock flashing in his eyes. This profile was accurate, detailed, and logically rigorous; it was the kind of judgment only a veteran with decades of experience in criminal investigation could make.

"Qin An, immediately investigate the entire city's systems based on the characteristics Qi Feng described!" Liu Yuanshan decisively ordered.

"Yes!" Qin An immediately took out his phone and began making arrangements.

Qi Feng stood still, without boasting of his achievements. His gaze swept across the entire room once more.

In addition to the clues that have already been discovered, a tiny golden square is shimmering on a loose cement tile directly beneath the metal table.

A gold frame?

Qi Feng was stunned. After the system upgrade, new colors had appeared. Red frames represented clues, and what did gold frames represent? Core evidence?

He avoided the gaze of others, pretended to inspect the support under the metal table, and squatted down.

He gripped the edge of the loose cement tile with his fingers and pried it off with a sudden burst of strength.

Beneath the floor tiles was a small pit. Hidden inside the pit was a black iron box wrapped in layers of waterproof tarpaulin.

Qi Feng quickly opened the iron box.

Inside was a black diary and a yellowed old photograph.

Qi Feng glanced at the photo.

The photo shows a young woman holding a baby. The woman's face bears a striking resemblance to the three victims mentioned earlier.

Behind the woman stood a man in a white coat. Half of his face was burned away, but his remaining eye radiated a chilling indifference—exactly the same as the man pushing the cart in the surveillance footage.

"You pervert! Gotcha!"