There is an essential difference between a psychopathic murderer and a murderer.

There are two types of homicide in which a murderer commits homicide: impulsive murder and premeditated murder.

But in either case, the result is to kill the other party.

As long as the police conduct an in-depth investigation around the victim, they can basically find the murderer.

Even if you can't catch it, there must be someone who is suspicious.

But homicidal maniacs kill people differently.

Their motives and purposes are often very simple, that is, they simply want to kill.

In other words, they kill because they like to kill, and they kill for the sake of killing.

It is precisely for this reason that many cases committed by perverted murderers are difficult to detect.

First, the victims are random and have little connection with each other, unless the homicidal maniac has some kind of fetish, he will choose a fixed group of people, such as young girls, young women, etc.

However, this kind of homicidal maniac is at the lowest end of the psychopathic homicidal maniac.

Just like Luo Bin, the people he killed were basically children.

Because his purpose was to find a successor, or rather, he wanted to make what he thought was the perfect artist, and young children were undoubtedly the best choice.

As long as the police find the common ground of the victims, they can basically lock down the murderer.

But people like the Shadow Man and the original owner, none of them have obvious fetishes, and the targets they choose are all random.

Of course, among the so many people killed by the original owner, there are still some connections between them.

That is, the original owner thinks they are sick!

It's just that this feature, except for the original owner, no one else knows, since others don't know, it is equivalent to nothing.

Second, many vicious cases, obviously there are a lot of clues at the scene, and they seem to be full of flaws, but they can't be detected, because the murderer is too cunning? Or are the police too incompetent?

These two possibilities cannot be ruled out, but the key factor is not here.

A lot of psychopathic murderers kill, they don't feel like they're killing someone, or they know they're killing and they're enjoying the process.

Whether they know they kill or not, these people have one thing in common – they don't do superfluous things.

After all, the more you do, the more you make mistakes, and the more flaws you have.

Unlike ordinary murderers, murderers don't care about being discovered, and even some murderers will deliberately leave flaws and clues at the scene after killing someone.

Provoking the police and watching them run around like headless flies is one thing to satisfy their bad taste, but more so it's about finding excitement and putting themselves in danger so that they can force themselves to grow.

It's like walking on a zipline, dancing on the tip of a knife, looking for excitement in danger, and getting pleasure in the thrill.

But looking at Guo Zihao's case, it was torture and murder, and it was a secret room, and the scene seemed to be very clean and perfect, but there were flaws everywhere.

The creation of secret rooms is generally a means for ordinary murderers to induce or confuse the direction of the police investigation, which seems to be very clever.

But the real murderer disdains such petty means.

No matter how clever the secret room is, as long as it is artificially created, it will leave traces and be seen through.

It's like a magician performing a magic trick.

When you know the principles and mechanics of magic, you will feel that the so-called secret room is nothing more than that, if it were you, you would definitely do it better than the other party.

For a true murderer, instead of wasting time making secret rooms, it is better to do something else, such as abusing the victim for a while or something.

To put it simply, it was not a perverted murderer who killed Guo Zihao, but a premeditated murderer.

Whether it is using a tool hammer to torture Guo Zihao, or leaving a wallpaper with the word Y on his computer, or creating a secret room, it is just a small trick to hide people's eyes and ears and interfere with the police's sight.

Even in Xu Mo's opinion, the murderer's modus operandi is not as good as Song Lang.

After all, Song Lang only left a Y-word mark at the death scene of Zhao Yiming's case, and this one move made the police continue to investigate in depth.

However, it can also be seen from this that the murderer who killed Guo Zihao is a novice.

Wang Qiang's death also proved Xu Mo's speculation from the side.

Killing people in front of the police seems to be very smart and can blame Xu Mo, but in fact it is very stupid.

Who is Xu Mo?

People give nicknames to the Great Detective.

A person who can assist the police in solving the case must have a high IQ, and will he do such a stupid thing as killing people in public, and killing people in front of the police?

"Are you stupid, or are you thinking of me as stupid?"

The corners of Xu Mo's mouth curled, and a sneer appeared.

As for Xu Mo's choice to cooperate with Fang Mo before, he just wanted to take the opportunity to do something.

On the contrary, it was the death of Yu Jin and the others, Xu Mo thought it was more interesting.

The murderer left only a balance at the scene, leaving Yu Jin and them to make their own choices.

In this way, the murderer not only did not participate in the murder himself, but also successfully killed three people, so that the police had no direction to investigate.

If there were no two cases, Guo Zihao and Wang Qiang, the murder of the unfinished building alone would have been enough for the police to have a headache for a long time.

It can be seen from this that the murderer who indirectly killed Yu Jin not only knows Yu Jin and the three of them very well, but also has a deep study of human nature.

Compared with the murderer who killed Guo Zihao and Wang Qiang, this murderer is more advanced and more in line with the characteristics of a perverted murderer.

"Three murders, three murderers, interesting."

Xu Mo sat in the corner, seemingly reading a book, but in fact thinking about the case.

"Fang Mo, I don't know if you thought of this?"

Thinking of this, Xu Mo's expression became weird, and he turned his head to look at An Xin, who was sitting at the door of the library, pretending to be a student reading, but actually observing himself.

Sensing Xu Mo's gaze, An Xin hurriedly withdrew his gaze and lowered his head to read the book seriously.

Looking at An Xin, who was covering his ears and stealing the bell, Xu Mo smiled.

Xu Mo was not surprised at all that Fang Mo asked An Xin to spy on him, but he also saw one thing from this incident.

Fang Mo's current situation in the police station is not too good.

Actually, it's normal to think about it.

In the 404 case, Xu Mo was regarded as a suspect, and Fang Mo and Chen Shi bit him to death.

At that time, it seemed that Fang Mo had no problem doing this.

But with the exposure of Song Lang and Chen Shi, many people couldn't help but wonder, did Fang Mo really not notice anything unusual? Did he really believe in his apprentice that much?

Or did Fang Mo notice it and have some suspicions, but he deliberately turned a blind eye because he had always suspected Xu Mo?

Although there is no basis for such an idea, who can say clearly about the human heart?

In addition, this time there was another murder case in Baiyin University, Fang Mo did not go to the scene to investigate or investigate the case at the first time, but went to Xu Mo and took Xu Mo back to the police station without any evidence.

Even people who didn't think so before can't help but think in this direction.

"Fang Mo, you are really persistent, it's just that you let a newcomer spy on me, aren't you afraid that he will have an accident?"

Immediately, Xu Mo closed the book, stood up, and walked straight towards An Xin.