Sure enough, in the lower right corner, there was an arc from welding.

However, the green paint in that area had been worn off.

He stood up, pointed with his hand, "If I'm not mistaken, this area is likely the result of the gas canister being dragged upward, causing the protrusion to rub against the wall."

"Moreover, right above this protrusion, you can see multiple scratches on parts of the gas canister as well."

"These scratches must have also been caused by the gas canister coming into contact with the uneven surface outside the wall."

Although no fingerprints or biological information of the suspect have been found on the paint can, the marks on the gas canister match those at the scene perfectly.

Next, Jiang An set the gas canister down.

"At present, I can only say that his suspicion is very high."

"However, to determine if he is the murderer, we need more evidence."

Following that, Jiang An moved from the balcony to the entrance area of the living room.

He squatted down and opened the shoe cabinet at the entrance.

Seeing this, Li Jian, Chen He, and Wan all came over.

Seeing Jiang An squatting by the shoe cabinet, the three were even more puzzled.

Could there be evidence on these shoes as well?

The three of them all had questions but no one voiced them.

They waited quietly.

Having worked together on so many cases, Li Jian knew Jiang An had many unconventional tricks when solving cases.

At that moment, Li Jian squatted down, picked up a shoe, and observed it carefully.

Suddenly, his gaze fell on a pair of men's black sneakers.

Li Jian squatted down to take a closer look before asking, "Jiang An, what's up?"

Jiang An turned and replied, "Mr. Li, I think these shoes were worn by the killer during the crime."

As he finished speaking, Chen He and Wan also squatted down.

After a long observation, Wan asked, "These men's black sneakers don't seem special?"

"How can you determine these shoes were worn during the crime?"

Li Jian and Chen He looked confused.

Jiang An flipped the shoes over, displaying the bottom of the shoes.

He pointed with his hand, "There are many patterns on the soles, and you can see some smoke residue in the grooves."

"Smoke residue?"

Since they were black shoes, it was hard to discern the smoke residue on the soles.

Jiang An extended his pinky finger and rubbed it in the gaps.

"Look!"

Jiang An extended his pinky finger again.

Indeed, there was some smoke residue on the tip of his finger.

This kind of black smoke residue can only form in environments with intense burning. Under a microscope, you can clearly see fine smoke particles.

Li Jian glanced at it, "Makes sense."

"Such fine dust particles wouldn't form outdoors unless in a confined fire setting."

Immediately, Jiang An put the shoes back on the ground.

He extended his hand again, gently scraping the surface of the shoes.

"There's no smoke residue on the black surface."

"He must have dealt with the surface but failed to clean the indentations."

Wan immediately gave a thumbs up.

"The suspect's intelligence is high, but our Mr. Jiang is even smarter."

Chen He smiled, "I think you understood the meaning but didn't express it clearly; this is a case of 'the devil is one foot tall, the virtue ten.'"

Li Jian carefully observed the black sneakers. With the previous gas can information, he was sure the male occupants of this room were likely criminal suspects.

As he was mulling over this, Jiang An said in a deep voice, "I think the motive for this crime is most likely passion. The cohabiting man possibly suspected the woman of infidelity and committed murder."

Li Jian nodded in agreement.

"I also find this possibility very high."

Then Li Jian stood up, "Since the suspect is confirmed, let's proceed to apprehend him immediately."

"It's unfortunate we didn't realize Zhong Shuang was the killer when we first saw him."

"Otherwise, we would have already caught the culprit."

As they spoke, Wan also looked remorseful.

"No wonder he was so enthusiastic, he must have been trying to find a chance to escape."

Finally, Li Jian shook his head and said solemnly, "If we came up a few minutes later, we might have caught them inside."

Chen He walked over and patted Li Jian on the shoulder.

"Mr. Li, don't blame yourself too much."

"The suspect's counter-anti-investigation capabilities are strong."

"Otherwise, there's no way we'd spend so much time without making much progress."

"Now, with the suspect's identity and target confirmed, we just need to find him."

Li Jian and Chen He shared a glance, both showing determination in their eyes.

Then Li Jian said, "We can't delay; let's start the pursuit immediately."

"Wan, capture the photos on the coffee table and send them to all the police stations and traffic checkpoints in Jiangcheng to look for the suspect Zhong Shuang."

"Yes! Mr. Li, I'll handle it right away."

At that moment, Jiang An was deep in thought.

He stood there with a heavy expression.

Li Jian noticed out of the corner of his eye, "What's wrong? Is there something off?"

Jiang An replied, "Mr. Li, I'm considering a very important question."

"What question?"

"Why is the suspect so familiar with the scene's environment?"

After pausing briefly, Jiang An continued his analysis, "From our scene investigation, we can roughly determine that the killer climbed in through a window of that office building."

"How did the killer know that window could be climbed through?"

"How did the killer know entering through that window would lead him to the entrance of Chen Minghao's office?"

"Crucially, the door lock to Chen Minghao's office was not damaged; how did the killer get inside?"

"Even if the suspect stalked someone that night, could he be so familiar with Minghao Clothing Factory's surveillance to cleverly avoid all the cameras?"

After a moment, Wan spoke, "Indeed! That is very unusual."

Li Jian recalled the entire layout of Minghao Clothing Factory.

From what they previously understood, the factory was not open to the public.

So why was the suspect so familiar with it?

Wan speculated, "Could the suspect be an employee of Minghao Clothing Factory?"

Chen He shook his head, "While sorting the people who bought gasoline earlier, we matched against the employees of Minghao Clothing Factory and found no overlaps."

"Therefore, the suspect Zhong Shuang should not be an employee of Minghao Clothing Factory."

After moments, Li Jian, Chen He, and Wan all focused their attention on Jiang An.

Thinking for a while, Jiang An did not immediately indicate his thoughts.

He walked into the living room and continued searching.

He searched through the TV cabinet, coffee table drawers, and then the cabinet and drawers in the bedroom.

Wan followed behind, asking seriously, "Brother Jiang An, what are you looking for?"

Jiang An replied, "I am looking for anything with a professional attribute."

"Professional attribute materials?"

Wan didn't quite understand right away.

Suddenly, Jiang An pulled out a medical examination notice from the bedside table drawer.

On the notice, it stated personal information, "Name: Zhong Shuang, Age: 25, Unit: Mineral Water Company, Economic Development Zone, Jiangcheng."

After a quick glance, Jiang An said, "I know what Zhong Shuang's profession is."

"Turns out he is a water delivery man, and he's responsible for the Economic Development Zone's water delivery tasks."

Upon hearing this, Li Jian and Chen He were suddenly taken aback.

Then Jiang An said, "Generally, water delivery workers bring drinking water to each office."

"If he is responsible for the Minghao Clothing Factory area's water delivery, he could have access to Chen Minghao's office."

Li Jian nodded after hearing this.

"Jiang An's analysis is very sound, reasonable and rational."

"Now it appears he is indeed the suspect."

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