During the investigation of this case, the relationship between Takagi and Sato Miwako seemed to have undergone subtle and positive changes.

But the brief warmth cannot cover up the darkness of the case itself.

After arresting the criminal, by comparing the skin flakes left on the stun gun, it was basically confirmed that this man named Guo Jing Yonggui was the murderer who killed Ping Dongtangci.

He is the murderer who killed Ping Dongtangci, not the murderer of the serial killer.

First of all, the age difference is not correct. Twenty years ago, Guo Jing Yonggui was just a child.

It's impossible to kill someone.

After the interrogation, they learned a shocking news.

The third victim killed by the murderer fifteen years ago was lawyer Jin Guojing, who was the father of the other party.

Twenty years ago, the real murderer of the serial homicide case was Ping Dongtangci, and Guo Jing Yonggui committed the crime this time just to avenge his father!

"Detective Tang Ze, your guess is correct. This is the letter 'n' with the direction reversed." After learning the details of the case, Gao Mu couldn't help but sigh: "He really just changed the angle of the letter.

To hide the scars on the deceased’s back.”

That's right, since Pingdong Tangci is the murderer,

There would be a "one-way cut" on his back by Inspector Matsumoto, so in order to cover up the evidence and put the blame on the serial killer, he carved the letter "n".

However, the letter "n" was not carved upright, but sideways, covering the horizontal line on the other side, so Tang Ze and others thought it was the letter "z" after seeing it.

As for why Guo Jing Yonggui knew the details of the case, it was because this was also normal.

Because he is a relative of the deceased, he has the right to know the details of the case, including the details that the murderer carved letters on the deceased's back and there was a huge scar on his back that was cut by the criminal.

According to Guo Jingyonggui, he said that he was actually in the room on the day he was killed.

Although the criminal had changed his appearance, he remembered the other person's voice and way of speaking, and also remembered the whistle used when killing people.

One day after he became an adult, he accidentally saw Ping Dongtangci's interview on TV.

I felt that the other person's voice and way of speaking were very similar to the enemy who killed my father when I was young.

With some suspicion, he began to visit every mahjong parlor his father might go to, and confirmed the connection between the three victims, including his own father, and Pingdong Tangci.

The reason why he learned all this 15 years later was because he was not exposed to mahjong until he grew up and knew that "e (east), s (west), w (south)" were mahjong terms.

And this is the whole truth of this murder case.

Ping Dongtang, a former serial killer, was killed by the victim's son. The son also planned to kill the real murderer and put the blame on him.

I have to say that Guo Jing Yonggui's plan was very good. If he put the blame on the murderer himself and he was killed by him, then he, as the son of the victim, would have been out of the police's search range.

In this case, it would be a miracle if the criminal could be caught.

Unfortunately, Tang Ze intercepted him midway and arrested him immediately.

As for Ping Dongtang's motive for committing the crime, Guo Jing Yonggui also interrogated him before killing him.

This heinous serial murder case began with just an ordinary conversation.

That day, several people playing mahjong were discussing completely criminal topics, such as whether it was possible to secretly take away the other party's gun without being detected by the criminal.

Ping Dongtangci had different opinions with the others. In the end, Ping Dongtangci decided to take direct action to prove his complete crime and slap several people in the face.

Later, Pingdong Tangci did it,

But he thought that he would convince several people and be praised by him, but who knew that the doctor and the university teaching assistant teacher would criticize him.

And claimed that it was impossible to be friends with a criminal anymore.

Perhaps to them, it was just an ordinary chat and argument, so they didn't take it seriously.

But Ping Dongtang was the only one who took it seriously and took action.

So after facing the responsibilities of the two, it goes without saying that Ping Dongtangci was furious.

Tang Ze could even put himself in the other person's thoughts at that time.

It’s like a person holding his breath, wanting to prove himself, but when he makes an achievement and shows it to someone who disagrees with him, the other person doesn’t take it seriously at all, thinks he did something wrong, and doesn’t want to associate with him anymore.

How could he not be furious?

At the same time, he was also afraid that his crime would become a handle and a stain on him, so Ping Dongtangci directly killed the two people to vent his anger and silence them.

Lawyer Guo Jingjin, who jokingly suggested that Ping Dongtang commit a complete crime, was threatened by him and said he was guilty of the same crime, so he remained silent.

Five years later, Guo Jingjin once again tried to persuade Ping Dongtangci to surrender himself, but Ping Dongtangci was worried that if he refused, Guo Jingjin would go to the police alone to inform on him.

So he used the same method to kill Guo Jingjin, and he escaped by luck.

"So this is the truth of everything..." Officer Megure said with a complicated expression: "Morimura-senpai can finally rest in peace."

"Yes, but the ending of this case is really not funny at all."

Superintendent Matsumoto touched the hideous scar across his left eye and sighed: "The victim's son killed the criminal in the same way as before. This is our dereliction of duty..."

But they also paid a heavy price for this case.

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