In front of the computer in the office, You Yingying had been sitting motionless for I don't know how long, a pair of red eyes staring at the screen without blinking, and the cigarette in his left hand was about to burn out, leaving only a long piece of soot.

On the screen, there is a suicide note collected as evidence. The familiar handwriting, no matter how many times you look at it, still makes You Hero's heart ache. It constantly reminds You Hero that the good brothers and good comrades-in-arms who grew up together since childhood can never see each other again.

In the afternoon, after returning from the scene of the fall from the building, You Yingying locked himself in his office, all the evidence was revisited by him, and all the clues collided and intertwined in his mind. You Yingying has a ridiculous conjecture that even he doesn't want to believe, but reality seems to be constantly verifying this conjecture.

Two weeks ago, Zhang Zhan, the deputy captain of the criminal police team, was found dead in his home, and all the clues point to the same conclusion - suicide by poisoning. Although medical records and medications for depression were found in Zhang Zhan's home, You Yingying could hardly believe that his old friend, who grew up wearing a pair of pants, would commit suicide because of depression.

What was especially strange to You Yingying was the suicide note left by Zhang Zhan. Judging from the content alone, there is nothing surprising about this suicide note, it is nothing more than writing some of the anguish in my heart and the arrangements behind me. The format of the suicide note is written in the top box of the first line, the second line is written in two empty spaces, and the third line is written in the top box, so repeatedly, which does not seem to be anything special. But for You Yingying, such a writing format carries a memory from many years ago.

When he was a student, Zhang Zhan had always been interested in cryptography, and in order to figure out new encryption methods, he often racked his brains without sleep or food. Every time he gains something, he will treat it as a treasure, copy it neatly on paper, and come to You Hero to bet on decryption. The top is a hint, the bottom is a cipher, and no matter how the content changes, the format of the writing is the same, the top box, the empty space, the top space, the empty space...... This is the customary format of Zhang Zhan when he writes password codes, and he never uses it in ordinary times.

Later, after the two of them worked, they were busy, and gradually there was no time to play such games. You Yingying has lost count of how many dinners he has won and how many bottles of drinks he has lost. However, as soon as he saw this format, Zhang Zhan seemed to have a look in front of him with a look of anger coming to him to bet on decryption. It's just that You Hero never thought that seeing this format on paper many years later turned out to be Zhang Zhan's masterpiece.

The content of the code has long been interpreted by the tour hero. Five, twenty-nine, twenty-three...... A string of seemingly meaningless numbers is the message that Zhang Zhan hides behind his suicide note. However, as for what Zhang Zhan wanted to express, You Hero was confused, could it be double encryption, or did the numbers themselves represent some kind of meaning?

At that time, You Yingying squeezed every trace of his memories fiercely, but found nothing. However, there is one thing he is convinced of, if a person is really determined to die, how can he still have the heart to use a code to transmit information, Zhang Zhan is definitely not a suicide.

After that, as an old criminal policeman, You Yingying began to carefully investigate every bit of Zhang Zhan before his death with his professionalism and sensitivity. Vaguely, he discovers that Zhang Zhan's anomaly seems to have started with a homicide he had taken over two weeks before his death.

This was an ordinary case, the murderer committed a drunken assault and stabbed the deceased to death in the street. The witnesses and surveillance were complete, and the murderer was arrested on the spot. Although the murderer insisted that it was an accident during the interrogation and that he had no intention of killing, everyone knew that it was just a meaningless quibble. After completing the process, the entire case was closed steadily.

But Zhang Zhan showed an unusual interest in the case, spending a lot of time investigating and reviewing many past files. You Yingying also knew a little about this before, but he didn't pay attention to it at the time, he just thought that his old friend's brains had flare up again.

After Zhang Zhan's accident, You Yingying carefully studied the homicide case and the old case files that Zhang Zhan had reviewed before his death. However, when he looked at these cases together, You Yingying's brain seemed to explode all at once.

Time, time is just too strange. Counting Zhang Zhan, there are a total of eight cases, except for the two cases in the middle, where the date of the case is 14 days apart, the date of each case is not much and the difference is 7 days. If we assume that there is an unknown case between the two cases that are fourteen days apart, then the time of death of the deceased in each case in order exactly coincides with the sequence left by Zhang Zhan.

Moreover, You Hero also found that there was a more or less connection between the deceased in the adjacent cases on the date of the crime. Some were eyewitnesses to the previous case, some were relatives of the deceased, and some were colleagues of the deceased...... However, without exception, they all had direct contact with the deceased on the day of the previous case.

These discoveries may also be explained by coincidence, but what really makes You Hero shudder is that Zhang Zhan's own time of death is not the last few of the sequences he left behind.

Sure enough, seven days after Zhang Zhan's death, an "accident" happened as scheduled. And today's fall incident once again bloodily verified this law. There is only the last paragraph left in the number series left by Zhang Zhan, and in seven days, You Yingying knows that maybe this is his last chance.

Long plumes of soot fell to the table. You Yingying stood up and rubbed his face fiercely, as if he wanted to brush away all the hesitation and retreat. A crazy idea had been spinning in his mind for a long, long time, and now, it was time to make it happen.

The night was dark, the stars were dim, and the wind whistled outside the window. You Hero stood alone in his room. He didn't turn on the light, and the heavy darkness of the night invaded the room uninvited, staining it a deep gray.

You Hero stood tall and stood in front of the mirror with a serious face. Police rank, police number, badge, collar flower...... Police uniforms and accessories were meticulously worn on him. The long-term high-intensity work and the recent series of changes made You Yingying's eyebrows faintly tired, but this could not dilute the heroic spirit in his bones at all.

You Yingying saluted himself solemnly in the mirror, silent as water, and only the whining wind through the window was left in the room, which seemed to be playing an unspeakable sad song for You Yingying.

After a long time, You Yingying resolutely took off a police uniform, folded it, smoothed out every wrinkle, and put it into the wardrobe with a precious and heavy face. Then he changed into an old black jacket and a pair of worn-out cargo pants that were washed and whitened.

Looking at himself in the mirror carefully, You Yingying was still a little dissatisfied, and he rubbed his hair again and deliberately messed them up.

"Almost. You Hero muttered to himself.

The dashing and heroic policeman has disappeared, leaving only a down-and-out man with a tired face.

You Hero opened the backpack next to him, and finally checked the props inside.

Everything was ready, You Hero hurried downstairs, and the cold wind at night passed through the building, making a whining wail.

From this moment on, the tour hero as a police officer no longer exists.

Either become a prisoner or become a dead person.

The back of the wandering hero melts into the dark night and disappears without a trace.