Littering cigarette butts or spitting won't get you punished if you're caught; you'll just get a reprimand.

The elderly people also wore red armbands and put up big signs urging everyone to be civilized and hygienic.

These elderly people also saw the background image from the local police officer, especially the long bag he was carrying.

If you see someone carrying a bag that is 70 centimeters long or longer than 1.3 meters, call the local police officer. Instruct them not to follow, not to talk to, and not to obstruct.

In addition to mobilizing the masses, several teams went to several taxi companies and car rental companies in Shanghai to investigate and look for clues.

Believe it or not, a taxi driver actually picked up a passenger like that. He picked the person up at the ferry terminal, and before the passenger got in, he glanced at him, worried that it would be difficult to let go of the bag in the car.

I was thinking of folding down the front seats so the passenger could put their bag there. But the passenger refused and told me to just drive.

"What else did you talk about? What was his destination?" one of the visiting police officers asked.

"I asked, I was really curious about what was in the box, it was so long," the driver said.

"What did he say?"

"He said it was a piano. I don't know what kind of piano it was, maybe an electronic keyboard! Oh, his destination was the music academy's guesthouse," the driver said.

"Tell me, what did that person look like?"

"It's hard to say for sure. I didn't even see what he looked like. Let me describe his appearance first. He was wearing a long-sleeved shirt, jeans, and leather shoes, with a very stylish hat—I can't describe the hat—and sunglasses. He had a small braid tied at the back of his head. From a distance, you might mistake him for a woman, but you only realize he's a man when you get closer. I guess all artists look like that."

The driver provided quite detailed information about the exterior. With this lead, we reported it.

Immediately afterwards, we went to the music academy's guesthouse to check. Based on the physical characteristics, the guesthouse confirmed that there was indeed such a person, and he had checked out early this morning.

Of course, since accommodation requires identification information, the investigators also asked about this.

The guesthouse staff said that when they came to process the paperwork, they used a letter of introduction with the seal of the Suzhou Conservatory of Music. The letter stated that their institute was sending teacher Yuan Liang to the guesthouse for a teaching visit, and requested their assistance.

They then mentioned that this teacher surnamed Yuan would carry his bag with him every day when he went out. Whether he was going to the music academy or not, they didn't know.

Immediately, I borrowed the guesthouse's phone to call the Suzhou Conservatory of Music and ask if there was a teacher named Yuan Liang.

Upon inquiry, it turned out that someone was indeed there, currently in class. Further inquiry revealed that this person named Yuan Liang had not been to Shanghai in the past two days.

"No, he teaches every day, he's in charge of three classes. I've seen him going to and from get off work. What? He checked out of the Shanghai Conservatory of Music guesthouse this morning? Is he a monkey? He can somersault back and forth in one go. I can vouch for him, I saw him go into the office this morning!"

According to the assurances from the Su Yinyuan office, Yuan Liang has not been on any business trips recently, so the person currently at the guesthouse is highly suspicious.

Immediately seal off the area and await the arrival of forensic experts.

I must commend the staff at the guesthouse; they were incredibly capable and diligent, leaving no trace for criminal investigation.

Not only were the bed sheets and blankets changed, but the tables and chairs were also wiped down, the floor was swept, and mopped.

When asked about the sheets and blankets, they said they had been washed.

Whether it's a guesthouse or a hotel, the rule is to clean up as soon as people leave. The staff didn't do anything wrong, but it just infuriated the investigators.

If no one carrying a bag longer than one meter is found leaving the city through the checkpoints at various exits, then the suspect is still inside the city.

Fortunately, the guesthouse staff provided another clue: the fake Yuan Liang who came to check in spoke very awkwardly, and it was impossible to tell which dialect he was speaking.

It's the kind of Mandarin with a local accent.

Moreover, it sounded awkward. Although it was a clue, it wasn't very useful. It could only be passed on to the old men and women. The backpacker had an awkward accent, was wearing a hat and sunglasses, and seemed to be from out of town.

Another point is that, based on clues provided by the suspects they met, he has a Chinese face, but because he was wearing sunglasses, they couldn't describe his features.

Three days passed quickly. The roads out of the city were blocked, which caused some complaints and rumors. Everyone knew that the pressure to solve the case was immense.

Did the neighborhood committee members find anything? The campaign to promote civility and hygiene is still ongoing, so they took advantage of this lull to begin checking on residents.

Based on their experience, the criminal investigators determined that it was unlikely the suspect was renting an apartment, but staying in a hotel or guesthouse was more probable. This assessment was based on the suspect's public image. Another possibility was that the young man didn't stay in hotels, guesthouses, or small inns. He was lurking somewhere, waiting to strike.

If the other party can take a taxi, it means they are acting alone. If they are hiding in one place, then supplies need to be prepared.

You should ask at shopping malls and small shops. If someone can buy daily necessities, it means they're in the vicinity. But they might not be carrying their bag when they buy daily necessities.

Therefore, shopping malls, convenience stores, and consignment shops should conduct more inquiries and investigations.

Wearing a small braid, a hat, and sunglasses are distinctive features. Anyone who has purchased items matching these features can be identified by the approximate area of ​​the purchase, further narrowing down the search area.

Most people would shop nearby rather than living in the west of the city and traveling to the east to buy daily necessities.

Only people with nothing better to do would do that.

After another day of investigation, they actually found a location.

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