Yunhua was stunned for a moment.

Then he smiled, "Thank you, but I'm not old, I don't need you to praise me for being young."

Ren Yufan also smiled, "I may really praise you politely, but I am completely from the bottom of my heart when I promise that what I said is the truth. If you don't believe it, you can ask... Team Leader Ling."

Ling Nan, who was clicked, also glanced at Yunhua again and said, "How to say it, if you say this again in ten years and twenty years later, it would be more obvious. Now, it really can't be compared. Are there a lot of changes in the age of 18 and 24? For beauties, the age of 30 is a hurdle, right? Or 40? Anyway, I didn't see anything, is it the same as before? This face is still so good-looking, it's just a little thinner and a little whiter than before, and I really can't tell anything else."

Yunhu was amused by Ling Nan, "It was originally true that my skin condition would not have declined too quickly at this age."

"Haha." Ren Yufan smiled coldly, his eyes even more meaningful, "This is not convincing. Otherwise, I would like to find her photos when she was 18 years old, compare them with the current photos, and then look for the samples in our database to compare the differences between 18 years old and 24 years old."

"Hey, Lao Ren, are you too idle?" Ling Nan walked over and climbed over Ren Yufan's shoulder speechlessly, "What should I do to compare this? OK, okay, stop talking nonsense, hurry up and do the important business."

Ren Yufan just smiled and said nothing more. The group followed Ling Nan to the technical room.

Since entering the bureau, Tan Zheng Yue has been following Yun Hua and protecting her. He has been staring at the whole process of Ren Yufan talking to Yun Hua just now.

Zheng Yue's face was not very good, he would not feel wrong. Ren Yufan's attitude towards painting was very unavoidable, as if he was a little hostile.

Sitting in front of the professional audio analysis equipment, Yunhua took a deep breath and calmed down his mood.

"Are you ready?" Ling Nan asked.

Yunhua pursed her lips, put on the professional headphones, and then nodded, "It's ready."

Ling Nan looked at her, "Then I'll start, listen carefully."

As he said that, he clicked the mouse and the audio began to play.

A hissing sound came from the headphones. It had been processed, but there was still noise. This was only because the quality of the original soundtrack was not good enough.

"Please, let me go, please..."

A horrified and desperate voice rang out.

Yunhua recognized it as soon as possible. This voice was the voice of her adoptive father Yun Congjun. Although she had never heard her adoptive father begging others in such tone, she could indeed recognize that this was his voice and would not be wrong.

"Have she begged you?" A very light voice, calm and gentle.

Is this the so-called murderer's voice?

Yunhua clenched her fists, this sound...this sound...

Whose voice is this?

She felt very familiar, but for a while, she couldn't even think of who the voice was!

Her memory is so good, how could she not remember it?

Before she could think about it carefully, the sound in the headphones rang again.

"I don't know what you are saying, I didn't do anything. She plotted against me. She and her mother were bitches..." Yun Congjun's voice was still full of resentment.

"Bang!"

A crisp slap.

Immediately afterwards, the sound that made Yunhua feel very familiar but could not call out the name sounded again, "You really never repent, so you should go to the eighteen levels of hell, and you will never be reborn. Don't worry, you won't die so quickly. When you are about to die, I will save you and let you feel the world more... cruel..."

"Who are you!"

Yun Congjun howled heartbrokenly, "Who are you? You, you... are she... right? She asked you to kill me, right? No, no, no, I am her father, I am her biological father, she asked you to kill me, this is a traitor!"

"Ha, you are so ruthless? You deserve it. But there is something you said wrong. I have to correct you. She is not your biological daughter, and sheds the blood of you, the beast. Now, are you satisfied? If you are satisfied, enjoy the feast of hundreds of dogs I prepared for you!"

"She is not my daughter? No, no, no, impossible, how could she be not my daughter? Bitch, bitch..."

Immediately afterwards, many dogs bite at close range and Yun Congjun's screams were all recorded.

Yunhua took off her headphones.

She supported her forehead with one hand, and the familiar voice kept repeating in her mind.

No one said anything, no one dared to interrupt her thinking.

A few minutes later, Ling Nan finally couldn't help it and whispered, "How to draw, have you heard anything?"

Yunhua looked up at him, with confusion in his eyes: "I...I think this voice is very familiar, but...but I really can't hear it. This... is a bit unreasonable, but I really can't hear it. Wait, wait, let me calm down, I'll listen again, don't worry, I'll listen again."

Rather than saying that she was talking to Ling Nan, it would be better to say that she was explaining to herself.

It is a very familiar voice, why can't I hear it?

This is unscientific.

"Don't force yourself too much." Tan Zheng Yue pressed Yun Hua's shoulder with one hand, giving her strength.

Yunhua nodded, but shook her head again, "I...I need to listen again."

Ling Nan pursed his lips and sighed, "Okay, I'll put it for you again."

Yun Hua took a deep breath, took a sip of water, put on his headphones again, nodded at Ling Nan, and Ling Nan received her signal and pressed the play button again.

The recording starts playing again.

This time, Yunhua heard more things.

There are a lot of dog barking, wind sounds, etc. In the background sound, as Ling Nan said before, the murderer's voice is relatively low and can be heard, but it feels different from the normal volume and needs to be listened more carefully.

The volume of the murderer is not caused by the recording equipment, but the sound of the murderer speaking is too small. This smallness cannot be solved by amplifying the amplifier. If it is necessary to amplify, it will cause a certain degree of distortion.

Listen again.

Yunhua has been able to fully remember the conversations in the recording, and every word is remembered in her heart, and she can even completely repeat them, but...

She still couldn't remember who the voice was.

It sounds so familiar, why can't you remember it if you don't know anything?

Yunhua took off his headphones, stood up and looked at Ling Nan, Ren Yufan and others, "I'm sorry, I tried my best, I really... I can't remember it, but the voice is very familiar, so familiar that I always feel that I can call him his name in one go, but when I really say it, I can't remember who the voice is... That feeling, how do I say... I..."

"Draw, okay, take a break." Tan Zheng Yue grabbed Yunhua's arm, "Don't hurry, take a break, don't make things difficult for yourself!"

Yunhua sighed a little dejectedly.

Before coming here, she was a little worried, worried that if she recognized who the person was, she didn't know how to deal with it, but now, she was very helpless because she couldn't recognize it at all.

"Can you let me hear it?" Tan Zheng Yue asked.

After Ling Nan exchanged glances with Ren Yufan, he nodded, "Okay, please sit down."

Tan Zheng Yue sat down and said to Ling Nan, "Take Huahua to the side and rest for a while and pour her a glass of water."

"Don't worry." Ling Nandao.

Yunhua held a cup of warm water in her hand, but she couldn't calm down.

Zheng Yue had already put on the headphones and held the mouse by himself, "Click here, right?"

"Yes." Ren Yufan replied on the side.

Tan Zheng Yue pressed the play button, his face looked very serious, and he began to listen carefully.

A recording, only a few words, was very short.

Talking about Zheng Yue will be finished soon.

He played it again...

He listened to it three times in total.

Then, Tan Zheng Yue took off his headphones and looked at Ling Nan, "I guess you have heard this recording too? What do you think? You know all the people around you who should know, so who do you think it will be?"

Ling Nan pursed his lips and shook his head, "I didn't hear it either. To be honest, I feel the same as when I draw. I always feel that the sound is very familiar, but I can't tell who it is."

Ren Yufan chuckled, "If you don't know, you think you are covering up criminals."

"It's really not." Ling Nan was helpless, "When I heard it, I felt very strange. I always felt that the voice was familiar, but if you asked me to tell me who's this, another one would not match. That's why I wanted to collect all the audio materials of familiar people around me, make a comparison, and let the data speak."

"No."

Talked to Zheng Yue directly.

"Why?" Ling Nan, Ren Yufan and Yun Hua both looked at it, not sure why.

Tan Zheng Yue narrowed his eyes, "Because that sound is a mix."

"Impossible!" Ren Yufan was the first to speak, "Our technology has been identified, and that sound was not synthesized by a computer!"

Tan Zheng Yue looked at Ren Yufan, "The mother book you identified was through the video information on the hard drive, but have you ever thought that there is a problem with this video information?"

Ren Yufan and Ling Nan's faces immediately became serious.

"You investigated Yun Congjun's case very carefully back then, but you didn't find such important evidence. But this year it was discovered, and it was discovered after the case was restarted this year. Is it such a coincidence?" Tan Zheng Yue said, "Even if it was such a coincidence, why do you think the murderer left such a video material that was not good for him or even convicted him? When the Yun Congjun case broke out, the murderer had already escaped and even had enough time to deal with all traces of activities outside Yun Congjun at the scene. Why did he leave this video? Or was it saved in a hard disk that could be saved for a long time?"

"What you mean is that this is the clue that the murderer deliberately left behind." Ling Nandao, "We have considered this, but the murderer is not a normal person after all, and he cannot consider it according to the normal person's thinking. Or the murderer is so perverted. It is possible that he deliberately leaves his own evidence of crime at the crime scene to satisfy his distorted mentality of fooling the police."

"There is indeed such a possibility, but I still firmly believe in another possibility." Talking to Zheng Yue, "especially this audio material made me more convinced of my suspicion. In the first conversation, Yun Congjun used his own voice, but the murderer used a synthetic recording. Therefore, the one recorded on the hard disk is a synthetic sound and there is no need to edit it. After you purify the sound again, it is impossible to find synthetic traces, because the video material is not synthetic."

Ling Nan and Ren Yufan's faces looked completely ugly.

"If this is the case, wouldn't this evidence be wasted again?" Ling Nan couldn't help but punch the wall, "I don't believe this murderer, he can really do it!"

"Facts have proved that after so many years, he is really planning to do it." Tan Zheng Yue said.
To be continued...