The squad leader's office.

Qin Yong was lounging with his legs crossed, holding a small teapot, and humming a pop song from thirty years ago.

A murder case is not scary. As long as the case can be solved, then you're a good cop.

Having worked from a frontline detective to now, Qin Yong has handled thousands of cases, big and small.

There are about a dozen or twenty murder cases every year.

He's forged through mountains of corpses and seas of blood.

In the face of murder cases, Qin Yong has long developed a calm demeanor.

When working on a case, you should be tense when necessary, and work overtime as needed. Now that the case is solved, it's time to relax.

In fact, it's understandable that police officers don't live long; when a case comes, adrenaline surges, and staying up several days and nights is a common occurrence.

Once a case is settled, the whole person seems to collapse.

Leaning back in the chair, Qin Yong was humming a tune and was close to falling asleep.

Tomorrow I'll report the case at the bureau, and maybe get off work by noon...

Bzzz, bzzz, bzzz.

The vibrating phone startled Qin Yong who was just about to fall asleep.

"Old Liu, are you done over there at the scene?"

The first crime scene is the part that Crime Scene Investigation is most focused on in all murder cases.

"Pretty much done here, but we've discovered something new."

"Oh? What's the situation?"

"Zhang Wei... might not be the murderer!"

Not the murderer?

Liu Guodong's words felt like an ice pick driving straight into Qin Yong's heart.

The haze of sleepiness immediately disappeared.

Springing up from the chair, Qin Yong's voice rose by eight degrees: "What did you just say?"

Liu Guodong's voice was low, "Zhang Wei might not be the murderer."

Far away at Cold Storage No. 8, Liu Guodong was currently wrapped in a coat, his nose running from the cold.

The work at the scene was nearing completion and would soon be finished.

After collecting the evidence, I'd be able to go back and get a good night's sleep.

As a result, a call from Lu Chuan implied all the work might have to start over.

"Did you find anything at the scene?"

Qin Yong's first reaction was that Liu Guodong had found some evidence at the scene.

But Zhang Wei had already confessed, and his account of the crime was very detailed; it didn't seem like he was taking the fall for someone else.

"There's nothing new at the scene. It's on Lu Chuan's end."

"He collected a drop-shaped bloodstain from the body fragments, and the blood type doesn't match the victim's. He suspects it was left by the killer."

"Before we even caught Zhang Wei, Lu Chuan had already done a bloodstain analysis on the droplet's type."

"But just now, after Lu Chuan collected Zhang Wei's blood, he discovered that Zhang Wei's blood type is A, while the droplet blood stain's type is AB."

"Zhang Wei is very likely not the murderer!"

Hanging up the phone, Qin Yong donned his coat and headed straight for the Crime Scene Investigation lab.

When Liu Guodong called to report to Qin Yong, Lu Chuan was processing the DNA sample collection from the bloodstains on the body fragments.

From a technical standpoint, Lu Chuan was merely providing the evidence found by the Crime Scene Investigation.

As for who the evidence pointed to, that wasn't Lu Chuan's concern.

So, after confirming that Zhang Wei's blood type did not match the droplet blood stain's type, Lu Chuan focused on extracting DNA information from the bloodstains.

When Qin Yong arrived, the DNA extraction from the droplet blood stain had just been completed.

"Lu, Old Liu said you have a new discovery here?"

Looking up to see Qin Yong come in, Lu Chuan nodded, then continued to operate the computer.

Compared to a few months ago, Lu Chuan was no longer the rookie who'd salute everyone he met.

Having won a first-class merit award, Lu Chuan had accumulated enough status.

Now, no one questioned Lu Chuan's joining date in the police force.

The entire Criminal Investigation Team knew that Lu Chuan was an expert in fingerprint identification and analysis.

This is one of the most valued technical skills.

One never knows when you might need someone's help with a fingerprint.

"Captain Qin, there's a new finding."

Lu Chuan detailed the mismatch between the blood types.

"According to Zhang Wei's account, he killed Wang Guizhi alone, and then drove the taxi to dispose of the body alone."

"If that's the case, there shouldn't be any blood on Wang Guizhi's body other than hers and Zhang Wei's."

"So where did this drop of blood come from?"

A single drop of blood might be insignificant, but at times, it can overturn an entire case.

When solving a case, it's not about a logical connection.

Just because it's logically sound, doesn't mean reality follows suit.

What happens in reality doesn't always align with logic.

For instance, Zhang Wei's motive for murder, based on his confession, was just a quarrel, and he killed her.

This clearly defies logic.

But it's possible in reality.

Therefore, in any case investigation, logical reasoning is essentially auxiliary analysis.

Ultimately, it must be supported by evidence.

Both testimonial and physical evidence need to be complete, and the evidence chain must be intact and without contradictions.

According to Zhang Wei's description, the motive for murder, weapon, crime scene, disposal process, and method, all form a closed loop.

But the drop of blood on the body fragments reveals a loophole in the closed loop.

Qin Yong obviously understood what Lu Chuan meant.

This drop of blood must be traced back to its source.

"How's the DNA match going?"

Lu Chuan had just input the information into the system and was in the process of matching.

As Qin Yong asked, the result came out just in time.

"Hmm?"

Glancing at the report, Lu Chuan hesitated slightly: "Information is of the same origin?"

"Information of the same origin?"

Seeing the DNA match result come out, Qin Yong stepped forward.

"Oh," Lu Chuan clicked the mouse to print the report: "When I collected Zhang Wei's blood, I also collected a hair sample to conduct a DNA information test."

"The bloodstain on Wang Guizhi's body fragments shows the same DNA information source as Zhang Wei's; there is a parent-child relationship between the two."

Parent-child relationship?

"Was Zhang Wei's son present when Zhang Wei committed the murder?"

Qin Yong immediately grasped the situation.

"Or perhaps... could it be that Zhang Wei wasn't the one who committed the murder, but his son?"

"Is Zhang Wei... covering for his son?"

Lu Chuan shook his head. These conclusions couldn't be distinguished by technical means.

But now that there's this clue, it shouldn't be hard to investigate clearly.

Zhang Wei said he was driving before the crime; checking his routes will reveal the truth.

Moreover, initial investigations indicate that Wang Guizhi took a bus home after work.

Investigating why she got off the bus midway to take a taxi will reveal everything.

Armed with the report, Qin Yong left the Crime Scene Investigation lab, making a call as he walked: "Zhang Hui, re-interrogate Zhang Wei!"

Lu Chuan tidied up the equipment and remaining test materials, put on his coat, and left as well.

The on-site work at Cold Storage No. 8 wasn't finished yet; Lu Chuan could still make it to the wrap-up now.

Interrogation room.

Faced with the DNA information match report in Zhang Hui's hand, Zhang Wei remained silent.

"Zhang Wei, did you kill the person or not?"

"Don't think that just because you keep silent, we can't do anything."

"We're already looking for the people who rode in your car three nights ago. We'll find out if it was you or your son driving that night with just a few questions."

As Zhang Wei's second interrogation proceeded, the arrest of Zhang Wei's son, Zhang Xuanrong, was simultaneously underway.

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