Regarding the idea proposed by Jiang An, after hearing it, the other three people all nodded in agreement.

Li Jian said, "For now, we cannot rule out this possibility."

Zhang Yean paced back and forth, "Jiang An, I think what you said makes a lot of sense."

"Only someone familiar would make us lower our guard."

Then, Jiang An placed the steel rod into the evidence bag and walked to the edge of the cliff.

He leaned out to take a look.

Wan hurriedly walked over.

"Junior, be careful!"

He instinctively grabbed Jiang An's back waistband from behind.

"Senior Wan, it's fine!"

Jiang An looked down.

Indeed.

According to the original body's position in his memory, it was exactly on the ground below.

Jiang An's gaze extended to see a very thin wire at the level of the 5th floor.

Then, Jiang An withdrew his gaze and squatted down.

He carefully examined the edge of the cliff.

"You can still see some dust scratch marks in this area."

Li Jian and Zhang Yean hurried over and squatted beside him to take a look.

Jiang An said in a deep voice, "This gap is not close to where the deceased fell, and it's very narrow, less than 1.5 meters."

"On a pitch-dark night, for the killer to throw the victim down here indicates a familiarity with the environment."

"Precisely speaking, a familiarity with the engineering structure and progress here."

After hearing Jiang An's analysis, Li Jian looked around.

When looking around, this row of walls had only one gap left.

It's estimated this should be the last sealing point on this side of the wall.

Zhang Yean said, "Could it be the killer is among the workers?"

Wan suddenly chimed in from behind.

"I think it's not just among the workers, I even think he's one of the workers on this floor."

"If they weren't familiar with this place, how would they find such a small gap?"

Zhang Yean also nodded and said, "Senior Wan, I agree with your point."

Li Jian nodded.

He stood up and said, "For now, this place aligns well with the fall site."

"Next, after we finish examining the site, we will immediately investigate all of Liu Jun's coworkers at that time."

Then, the four of them went to the 5th floor to examine the wire's attachment point.

Standing by the 5th floor window, one could see a yellow-painted iron rod outside the window.

Midway at the window level, there was a wire snagged on the iron rod.

Jiang An observed the spot where the wire was tied and noticed some of the paint had peeled off, showing signs of wear and tear.

Then, Jiang An looked up, spotting another horizontal metal wire not far away.

Furthermore, the height of both wires was very similar.

However, when Jiang An looked at the middle section of the wire.

The wire in front was slightly curved, lacking the tension of the wire farther away.

Jiang An instantly understood this was the result of the wire deforming under enormous outside force.

He turned and said, "Mr. Li, this wire should be the tool that cut Liu Jun's head."

"Whether from the wear signs on the attachment point or the deformation of the entire wire, it supports this conclusion."

Jiang An withdrew, leaving the optimal observation position for Li Jian.

"Indeed, the marks are very obvious!"

"Also, the friction between the metals is significant, very much in line with forceful pulling."

Zhang Yean and Wan both quickly leaned closer.

Jiang An said, "With this discovery, we can fully explain the first question the family raised at the forensic autopsy center."

Li Jian nodded.

After looking once, Zhang Yean, somewhat sheepishly, said, "Oh dear! It's all our fault for not investigating deeply back then, finding the trace evidence to confirm the head was cut mid-air."

Li Jian reassured.

"This isn't necessarily your fault; not everyone can be as talented as Jiang An."

Wan also patted Jiang An's shoulder, "You're a natural talent!"

Next, Zhang Yean took out a camera from the toolbox to photograph and record the deformed and worn area.

After completing all this, the four returned to the entrance of Building 5.

Jiang An looked up, noticing a surveillance camera not far away.

"Is that surveillance camera the one that recorded the deceased entering Building 5 that night?"

Zhang Yean nodded, "Yes."

"At the time, we expanded the monitoring timeframe, but still, there were no significant findings."

"Is that the only camera monitoring this building?"

"It's just that one."

As soon as these words fell, Li Jian said, "You all stay here, I'll go find their project manager to look for Liu Jun's coworkers."

"Wan, come with me."

At this moment.

At the entrance of Building 5, only Jiang An, Zhang Yean, and two other order-maintaining members of the crime investigation team were left.

Jiang An put down his flashlight, gloves, and other inspection equipment.

"Senior, I'd like to walk around Building 5."

"I'll accompany you! I was involved in the first site inspection and am familiar with the surroundings."

Then, the two walked around Building 5.

Jiang An looked up.

"Have the structures in this area changed?"

Zhang Yean thought for a moment.

"To my recollection, there shouldn't be any changes."

Jiang An walked and observed the building's exterior.

"The first-floor residences only have window frames, no glass."

"It's basically an open environment; even if the killer entered from here, we wouldn't know."

Zhang Yean frowned slightly.

"Exactly! The height of the window on the first floor is barely over 1 meter."

"With just a little effort, anyone can get into Building No. 5."

Immediately, Jiang An walked to the nearest window and carefully observed the exterior.

After a moment, he squatted down to examine the base of the window.

After inspecting one, he moved on to the next window.

From the window sill to the bottom, he examined carefully.

Zhang Yean followed behind him, examining together.

Twenty minutes later, Jiang An's gaze suddenly stopped.

He stared at the windowsill in front of him.

"Look here, Senior Sister!"

Upon hearing this, Zhang Yean hurried over.

"What is it?"

She looked closely and was shocked.

"Traces of climbing?"

Jiang An nodded.

"Didn't Mr. Zhang say last month there was a burglary here? Where exactly?"

"I was the one who examined last month's burglary scene."

"It was in the steel storage prefab room."

"Since that's the case, these aren't the thief's traces."

Zhang Yean chuckled and said, "A thief wouldn't come into such a rundown building; there's nothing valuable."

"The red mud on this windowsill is unusual. Could it be soil from the construction site?"

Jiang An shook his head.

"When we came in, I noticed the soil on the site wasn't this color."

"This red clay is quite special."

"Let's check the distribution of red soil in Jiangcheng."

Zhang Yean thought for a moment and said, "Could this place have traces of climbing from a suspect?"

"Or could it be marks left by other workers during construction?"

"For instance, someone might have climbed through the window to take a shortcut into Building No. 5."

Jiang An looked around and said solemnly, "Senior Sister, I think the possibility you mentioned is unlikely."

He pointed to the neighboring window on the left.

"There's a pile of stones under that window with a relatively lower height."

"If someone wanted to take a shortcut, why not choose the lower window?"

As he spoke, Jiang An mimicked climbing.

"Even at my height, climbing here isn't easy!"

Zhang Yean looked around.

"Comparatively, the windowsills on both sides are lower than this one."

Then she asked, "But, if this was the suspect's way into Building No. 5."

"Why would they choose the more difficult windowsill?"

After some thought, Jiang An replied, "I deduce the suspect probably didn't have the time to compare due to panic that night."

Meanwhile.

Li Jian and Wan arrived at the project department.

Seeing them enter, Mr. Zhang quickly stood up.

He warmly said, "Mr. Li, is there anything you need assistance with?"

After speaking, Mr. Zhang turned to his secretary, "Xiaomei, please make a good cup of tea for the officers."

The sudden hospitality left Li Jian and Wan puzzled.

It was vastly different from the attitude an hour ago.

However, Li Jian remained calm and said in a deep voice, "Mr. Zhang, please gather everyone staying in Liu Jun's dorm room for questioning."

"No problem! We'll fully cooperate."

Seeing the secretary bring two cups of green tea, Mr. Zhang instructed, "Quickly check if everyone from Liu Jun's dorm is present."

"Mr. Zhang, alright!"

After putting down the teacups, the secretary swiftly left.

"Mr. Li, this is fresh pre-rain tea from my hometown, please have a taste."

Li Jian picked up the cup and blew off the surface leaves.

Mr. Zhang suddenly asked quietly, "Mr. Li, is there any new development in the case?"

Li Jian took a sip of tea.

"Sorry, it's confidential right now."

Then, Mr. Zhang bent over and said, "Mr. Li, there are many reporters at the entrance claiming they'll leave only after the case is closed."

"That... you know, it's quite damaging."

"Moreover, if they report extensively, it'll severely affect our real estate sales."

"After all, many clients are superstitious about buildings where someone has died."

Hearing this.

Li Jian finally understood the hospitality.

After a moment of silence, he said, "If you want the reporters to leave quickly, there's only one way."

"What way?"

"Actively assist us in finding the truth of the case as quickly as possible."

Mr. Zhang promptly said, "Definitely...definitely."

"Absolutely cooperative! No slacking!"

Just then, secretary Xiaomei came over jogging.

"Mr. Zhang, one more person from Liu Jun's dorm is on the way, the others are here."

"Get in touch immediately!"

"If they're coming by train, pick them up at the station."

"If by plane, pick them up at the airport."

The secretary suddenly froze, with many question marks in mind.

Do we need to pick up a regular worker?

Immediately, Mr. Zhang hurriedly prompted, "Why not hurry up?"

"Yes! Yes!"

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