After the case was successfully solved, Su He's reputation was established at the Municipal Public Security Bureau.

No one expected her to find the crucial clue so quickly.

Just as Captain Chen said before, she is very clever and the young girl is no ordinary person; she is a skilled detective.

Some people who looked down on her before, those who thought she was too young, are now completely convinced of her worth.

So much so that Su He would greet her colleagues from the Municipal Bureau warmly every time she went to and from get off work.

Su He gradually adapted to her work at the Municipal Bureau, and her cooperation with Qi Yang and the others was also very good.

However, before they could even rest for long after the case was over, Captain Chen transferred them to another team to work on the case they were currently handling.

The serial murder case they were in charge of had made little progress after so long.

Five people have already died, which has had a very negative impact on society, so they were transferred to participate in the investigation.

Su He and the others immediately became serious and nervously flipped through the case file.

The serial murders occurred at Beijing No. 1 Middle School.

It's considered one of the better schools in Beijing, with both junior high and high school sections.

Since last month, people have been dying one after another at this school. As of the day before yesterday, a total of five people have died.

The first one is a teacher named Xu Haimo, who is 28 years old this year. He teaches Chinese at the school. It is said that he has a refined appearance and can write poetry. He is usually very popular among students at the school.

He died of poisoning after eating lunch in his office.

After his death, forensic doctors found rat poison in his lunchbox.

His lunchbox was brought from home, but it was placed in the boiler room at school, where students or teachers could heat up their meals for free.

Many students and teachers went to the boiler room that day, and it is possible that other people also went in, since there are usually only people there when they are heating up lunch.

This makes it very difficult to identify the murderer.

So the police station investigated but failed to catch the murderer.

Not long after, another person died at the school; it was a female student named Li Yuanyuan.

She died in the school toilet, and she was strangled.

Judging from the scene, Li Yuanyuan died at school the night before and was not discovered until the next day.

However, signs of struggle could still be seen at the scene, indicating that it was a homicide.

But since school had already let out and there were hardly any people at the school, no one knew why she died there.

Later, after inquiring with classmates who knew the situation, they learned that Li Yuanyuan was usually arrogant and domineering, known as the "big sister" of the school, and often led her henchmen to bully people.

That day, they didn't like a girl from the next class and planned to teach her a lesson after school, which is why they didn't leave after school.

After teaching the woman a lesson, the group went their separate ways, and everyone else went home. No one knew why Li Yuanyuan hadn't left.

The girl who was bullied by Li Yuanyuan that day also went home, and the investigation ruled out her as the perpetrator.

Furthermore, the investigation found that quite a few people at the school had been bullied by Li Yuanyuan, which could be considered a revenge incident, but no substantial evidence was found.

Unfortunately, not long after her death, her most loyal henchman, Jin Hong, also died.

However, she didn't die at school. Instead, she went out to play during the holidays and went missing. When she was found, she was dead in a dilapidated house in the suburbs. Her hands and feet were tied, and she was covered in injuries. She had been dead for several days.