30 minutes later, all of Liu Jun's former roommates arrived at the construction site project office, a total of six people.

Mr. Zhang said, "Mr. Li, everyone is here."

Li Jian nodded.

"First, let me introduce myself. I am Li Jian, the captain of the Criminal Investigation Team of the Jiangcheng City Public Security Bureau."

"Today, we are here to investigate the case of Liu Jun's fatal fall, and we want to understand some situations."

He turned to Mr. Zhang and said, "Bring them in one by one!"

"Okay! Following your instructions!"

Then he turned to the six people and said, "You must actively cooperate with Mr. Zhang."

"If the clues you provide can help me solve the case, I will consider giving you a raise."

Upon hearing the words "raise," the man at the front raised his hand to stay behind.

"Mr. Zhang, I'll go first."

"Alright, let's start with you, very proactive."

After the other five people left the office, Li Jian turned to look at Mr. Zhang.

He raised his eyebrows, "Please excuse yourself too."

Mr. Zhang hurriedly waved his hand.

"Sorry, I forgot my role here."

Then, he quickly opened the door and went out.

At this moment.

In the office, only Li Jian, Wan, and Chen Feng remained.

"I'll ask, you record!"

Li Jian began, "What is your relationship with Liu Jun?"

Chen Feng replied, "We were roommates!"

"Do you know Liu Jun well?"

Chen Feng shrugged, "We were just in the same room, not particularly well-known."

"Please recall the situation on the night before Liu Jun's death."

Chen Feng thought for a moment, then replied, "That night, I remember we had a dorm dinner. We ate at a nearby restaurant that serves ground-pot chicken."

"We all had some drinks, and the whole atmosphere was quite joyful."

"Around 11 o'clock, we all came back from outside together."

"When we got to the entrance of the construction site, Liu Jun said he was thirsty from drinking and wanted some water."

"He said he had left his cup on the 10th floor of the site during work earlier that day."

"Then he went alone to get the cup, while the rest of us went back to the dorm."

After Chen Feng finished speaking, Li Jian asked, "How much did Liu Jun drink?"

"About two cups of baijiu and three bottles of beer."

"How was he then? Was he walking normally?"

"Normal! He can handle four cups of baijiu."

"He certainly wasn't drunk that night!"

"Are you sure?"

"Yes!"

"We've drunk together six or seven times; I know he has a good tolerance."

After thinking for a moment, Li Jian asked again, "Was anyone with him when he left?"

Chen Feng shook his head.

"Ultimately, he left alone. We all returned to the dorm."

"We all fell asleep right after and only found out Liu Jun died the next day."

Li Jian asked, "Who knew you guys went out drinking that night?"

"Just us from the dorm!"

"Plus, there was no one we knew in the restaurant when we were eating."

After a moment of silence, Li Jian asked, "Is the relationship in your dorm harmonious?"

Chen Feng's gaze became evasive and he replied hesitantly, "Quite harmonious!"

"What do you mean?"

Li Jian pressed on, "Tell me about the discord?"

Meanwhile.

Jiang An and Zhang Yean carefully examined the other windows.

The sills of the other windows were very clean, with no signs of climbing.

Standing at the window with the red mud, Zhang Yean said, "It seems that only this spot has been climbed over!"

Jiang An nodded.

"The killer climbed through this window mainly to avoid the surveillance at the unit entrance."

"Senior sister, do you think the deceased Liu Jun would have lingered a long time to fetch a cup on the 10th floor?"

Zhang Yean responded, "Fetching a cup shouldn't have taken long!"

"If the deceased and the killer met on the 10th floor, doesn't that suggest that they appeared on the 10th floor around the same time?"

Zhang Yean thought for a moment and said, "Makes sense!"

"From the location of the incident, it indeed seems like such a coincidence!"

Jiang An then said, "From here to the staircase entrance is less than 20 meters."

"In other words, both the killer and Liu Jun basically entered Building 5 one after the other."

After a long while, Jiang An said, "Suddenly a new question has arisen in my mind: why was the timing so coincidental?"

Zhang Yean widened her eyes, "You mean the killer knew the victim's movements?"

Jiang An gently nodded!

Meanwhile.

In Mr. Zhang's office at the project site.

Seeing the man hesitating, Li Jian quickly said, "Please answer truthfully! We will keep it confidential!"

After a moment of silence, he looked up and asked, "Does what Mr. Zhang said about raising the salary for clues still stand?"

After a brief pause, Li Jian said, "I can remind Mr. Zhang of his promise."

"As for whether he will fulfill it, that's up to Mr. Zhang himself!"

Wan chimed in from the side.

"Trust the words of the leaders, their public promises are not just empty air."

Two minutes later, Chen Feng slowly said, "A week before Liu Jun's death, we were playing cards in the dormitory, and he had a conflict with Song Can from the opposite bed, they even got into a scuffle."

"But neither of them was seriously injured."

Li Jian listened and suddenly became interested.

He asked, "Who was present during that fight?"

"Many of us were there."

"What specifically was the time it happened?"

"I remember it was a week before Liu Jun's death. I don't recall the exact day."

"Moreover, the purpose of our dinner that night was to reconcile them and restore their friendship."

"How was their demeanor that night?"

"They both drank and clinked their glasses together."

"At that time, they clearly stated they had made up."

Upon hearing this, Li Jian seemed to have suddenly discovered a suspicious person.

"Did Song Can come back with you that night?"

Chen Feng replied, "We did walk back together, but he didn't enter the dormitory with us."

"He said he had a stomachache and went to a temporary toilet on the construction site."

"Do you know when Song Can returned?"

Chen Feng shook his head.

"I had been drinking that night, went back to sleep, and wasn't aware of when he returned."

Li Jian nodded.

"Besides this, is there any other clue?"

"Nothing else!"

"Thank you for your cooperation!"

"Officer, if this clue is useful, please tell Mr. Zhang to give me a raise!"

Li Jian nodded again.

After Chen Feng walked out of the office, Wan turned and asked, "Boss, should we let Song Can in next?"

"Let's wait and see, we're not yet sure if what Chen Feng said is true or false."

"Okay, I'll call in the next one!"

Soon, another skinny roommate walked in.

"Hello, we are officers from the Jiangcheng Criminal Investigation Team."

"We have a few questions for you."

Unlike Chen Feng's attitude, this man sat there expressionless and merely nodded slightly.

As if he had no turmoil or anticipation in his heart.

"How well do you know the deceased, Liu Jun?"

"Not that well, just roommates."

"Did Liu Jun have any disputes with others here?"

"Everyone is a colleague, no disputes."

"Were you there during the argument a week before his death with others in the dormitory?"

The man nodded.

"I was there!"

"Tell us about what happened then?"

"There were four of us playing cards, Liu Jun was unlucky, lost a few hundred, and spoke offensively."

"Song Can asked him to watch his words, and then they started fighting."

"Just because of that?"

"It was just this small matter."

Li Jian continued to ask, "That night after drinks, did Song Can return to the dormitory with you?"

"Sorry, I can't remember the situation clearly."

Meanwhile, Jiang An and Zhang Yean finished examining the scene and greeted Li Jian before driving to the Environmental Bureau.

The Environmental Bureau should be the best place to investigate the distribution of the red soil.

Thirty minutes later, in the office of Mr. Li, the head of the Environmental Bureau.

After Jiang An and Zhang Yean introduced themselves and explained their purpose, Mr. Li opened the local soil distribution map.

Jiang An said, "Mr. Li, I just showed you the picture, now this is the real thing."

He handed over a transparent evidence bag.

The evidence bag contained the red mud extracted from the scene.

Mr. Li took the red soil, compared it with the soil distribution in the book, and said, "This type of red soil is mainly distributed in the southern suburb of Jiangcheng."

"Southern suburb?"

Zhang Yean, a native local, said, "That place is very far from here."

Mr. Li nodded.

"That area is the most undeveloped part of Jiangcheng, primarily relying on red soil for growing crops."

"At least seventy or eighty kilometers away."

Jiang An listened and asked, "Mr. Li, is this red soil only in the southern suburb?"

"Is there such soil in other parts of Jiangcheng?"

Mr. Li reviewed the soil distribution map again.

"This is the only place in the local area."

Upon hearing this, Jiang An nodded lightly.

He was pondering in his mind.

If that red mud was left by the murderer, then what is the relationship between the murderer and the southern suburb?

After thanking Mr. Li, Jiang An and Zhang Yean walked out of the Environmental Bureau.

As soon as they sat in the car, Zhang Yean couldn't wait to ask, "Do you think the murderer might live in the southern suburb?"

Jiang An nodded, "That's indeed a possibility."

"I remember during the preliminary investigation, Mr. Zhang mentioned that this construction site is strictly managed, outsiders can't enter easily."

"Maybe we can suggest to Mr. Li to start with the workers' places of birth."

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