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Rain Night Butcher was a deranged serial killer active in the Guangzhou area in the early 90s.

His methods of committing crimes were extremely perverse. He enjoyed cutting off and collecting the genitals of his victims, and he would write down the details of the crimes in a diary afterward.

In Guangzhou, his name is truly something that can stop a child from crying.

Legend has it that he was inspired by a butcher in Hong Kong who committed a crime on a rainy night, which led to his imitation of the crime.

Just now, these memories burst into Gu Huai's mind.

What's different this time is that the case of the Rain Night Butcher caused such a stir in Guangdong Province that Gu Huai still remembers that his surname is Luo.

Of course, Gu Huai's memory of this case ends here.

As for the killer's full name, Gu Huai racked his brains but couldn't remember it.

It's all because those news reports always omit the killer's full name; now I can't even remember what his name was.

"Ah Huai, what did you just shout?" Wu Feilin's voice interrupted Gu Huai's thoughts. "What do you mean by 'matching'? What did you match?"

"Now I know why the killer waited 36 hours before making his move," Gu Huai said.

"Oh? Then tell me about it."

"Because the killer is waiting," Gu Huai said.

Hou Hao asked curiously, "Waiting for what?"

Gu Huai said, word by word, "Wait for it to rain."

Before anyone else could interrupt, Gu Huai asked Hou Hao directly, "Brother Hou, did it rain here the day before yesterday?"

"No..." Hou Hao said somewhat blankly, "But... what does rain have to do with murder?"

"The killer in Guangzhou had a habit of killing people on rainy days," Gu Huai explained. "Zhang Zhenhua died on a rainy day."

As soon as he finished speaking, Hou Hao and Ling Yue frowned deeply.

If things are really as Gu Huai said, then this case becomes complicated.

The situation report issued by the Guangzhou police stated that the murderer was extremely cunning, and despite committing a series of crimes, the Guangzhou police have yet to find any clues.

Seeing the frowns on their faces, Gu Huai continued, "I've only heard about this case. We need to check the specific details with people in Yangcheng to see if the murderer is as I've heard."

"No need," Wu Feilin waved his hand and said, "I have already inquired carefully with my colleagues in Yangcheng, and that person does indeed do what you said, only committing crimes on rainy days."

In fact, after learning about the Rain Night Butcher case, Wu Feilin immediately thought of the key factor of rainy days.

That's why he spoke in that way after listening to Ling Yue's investigative approach.

In his plan, he would answer everyone's questions and explain his understanding after they had read the documents.

Before he could even speak, Gu Huai blurted out his words first.

Thinking of this, Wu Feilin gave Gu Huai a meaningful look, "Since that's the case, Gu Huai, what's your opinion now?"

Ever since Gu Huai expressed his thoughts, he had been glancing at Wu Feilin out of the corner of his eye.

Therefore, he noticed the changes in Wu Feilin's expression.

After these two days of contact, Gu Huai had a pretty good grasp of Wu Feilin's temperament and character.

He wasn't an intolerant person; otherwise, he would have been able to use his position as captain to control himself when Gu Huai argued with him out of impatience.

He just habitually doesn't trust young people.

Otherwise, he wouldn't have raised Hou Hao to be like this.

Gu Huai knew that no matter what he said later, Wu Feilin would not truly believe him.

Instead of wasting words trying to persuade him, it's better to use concrete actions to truly win him over.

"I don't have any other ideas for the time being."

Looking at the meek and submissive Gu Huai, Wu Feilin finally felt much better. [So you weren't all that knowledgeable after all!]

Of course, such thoughts only lasted for a moment before vanishing.

He hadn't originally planned to rely on Gu Huai to solve the case.

However, Gu Huai's performance these past two days has been so outstanding that it has unconsciously made him feel a little hopeful for him.

Now that his expectations had been dashed, Wu Feilin had lost interest in continuing the conversation with them.

As the captain of the first brigade, he has a lot to do.

"Alright, I understand the situation. I will pass on what you reported. You can go about your business now."

"Okay, Captain, you're busy." Ling Yue didn't say anything more and got up to walk out.

Gu Huai followed closely behind her as they walked out.

Hou Hao originally wanted to ask his master what to do next, but seeing that the two were about to leave, Hou Hao thought for a moment and got up to follow them out.

As soon as he stepped outside, Hou Hao was about to ask why she left without saying anything, but before he could even speak, he saw Ling Yue holding onto the railing, her eyes fixed intently on Gu Huai.

"Tell me, what are your plans next?" Ling Yue asked. "Don't tell me you really don't have any ideas."

Gu Huai smiled and said, "As expected of Sister Ling, I really can't hide anything from you."

Hou Hao stared blankly at the two of them, who were working together in perfect harmony. "Ah Huai, why didn't you say so earlier if you had an idea?"

Gu Huai glanced at Hou Hao but did not explain.

He wasn't afraid that Hou Hao would tattle on him; Hou Hao wasn't that kind of person.

It's just that Hou Hao is Wu Feilin's apprentice after all, and it's wrong to talk about one's master in front of one's apprentice, no matter how you look at it.

Therefore, Gu Huai simply waved his hand lightly and turned to look at Ling Yue, "Having ideas is one thing, but before that, I need to trouble Sister Ling to do me a favor."

Ling Yue asked, puzzled, "What kind of busyness?"

Gu Huai smiled slightly, "It's very simple, just a small favor for you."

-----------------

"Yes, yes, yes, I've got it."

"Yes, I happen to have some free time and I was thinking of getting all the data sorted out first."

"Okay, thanks, Brother Jiang, you can go ahead with your work."

Zhang Zhenhua's case is currently a key case for the Criminal Investigation Detachment, so Wu Feilin naturally wouldn't place his hopes on Gu Huai and the other two.

This morning, he mobilized all available police resources to investigate Zhang Zhenhua and others around him.

The man named Jiang who just spoke to Ling Yue on the phone is the captain of the second squadron.

He led his men to investigate Zhang Zhenhua's social connections.

Ling Yue had just been asking him for the investigation results.

Since Ling Yue had always been in charge of compiling the team's data, Jiang Xingbang didn't think much of it and reported the investigation results directly to Ling Yue over the phone.

After Ling Yue briefly summarized what Jiang Xingbang had said, she handed the document filled with names to Gu Huai.

"Here you go, this is the information you requested."

After receiving the documents, Gu Huai couldn't wait to start reading them.

He now wants to see if there is anyone with the surname Luo in Zhang Zhenhua's social network.

"Now you can tell me, what exactly do you want this for?" Ling Yue asked, puzzled.

Gu Huai didn't answer Ling Yue's question immediately, but kept searching and searching.

He didn't raise his head until he saw the name he wanted among the countless names.

"Sister Ling, have you ever considered that the murderer who killed Zhang Zhenhua might be someone close to him?"