Eight years have passed.

Except for the police officers who took over the case back then, and the families of the victims who were waiting for the truth, many people can't remember what happened back then.

When Xiao Ran found Lei Kang, the Lei Brigade had just returned from other district bureaus.

As the captain of the first team of the criminal police and the person in charge of Thunder, Lei Kang's work can be said to be extremely busy, and it can be seen from the red silk in his eyes that even if Zhang Cailiang's case has been solved, he still hasn't had a good night's sleep tonight.

"Sit. ”

Seeing Xiao Ran come in, Lei Kang pointed to the chair in front of the desk, picked up the cup with strong tea and took two sips, "What's the matter?"

"Brigade Lei, do you remember the 721 case eight years ago?"

Xiao Ran looked at Lei Kang, because this case was investigated by Lei Kang, who was still the squadron leader back then.

Lei Kang's hand holding the teacup froze on his lips, and nodded solemnly: "How can such a profound case not remember." ”

"Profound?"

"Yes, I have never encountered a criminal with such a clever anti-reconnaissance method, and there is really no trace left at the scene except for the corpse. ”

Lei Kang frowned and said: "At that time, the DNA database had just been formed, and the city's police force didn't know how many roads for this case, and the technicians in charge of the comparison ate and slept in the office that month, but as a result, they still didn't find a reason...... It was also the only case that went unresolved during my time as a squadron leader. ”

Xiao Ran nodded with a heavy expression and said, "A few days ago, Pang Jinghui and I went to a company in the snack street to deal with a theft case. ”

"Huh?"

"I picked up a cigarette butt on the balcony of that company, and at that time I thought it was left by a thief, so I asked Yu Yu to help carry the DNA sequence. ”

Lei Kang frowned, his eyes looked at Xiao Ran firmly, he seemed to sense what Xiao Ran was going to say.

"Today, when I'm idle, I just compared it in the database. ”

Xiao Ran said very calmly, "Then I succeeded in comparing with the suspect in the 721 case." ”

With a smack on the ground, Lei Kang suddenly stood up from his seat, although when Xiao Ran told him about the case, he felt as if Xiao Ran had found some clues, although Xiao Ran was getting closer to his thoughts when he came later.

However, suddenly hearing Xiao Ran's statement that the comparison was successful, Lei Kang still couldn't believe it, he lit a cigarette with some excitement, took two puffs to ease his emotions, and looked at Xiao Ran solemnly and said, "Are you sure!"

Xiao Ran stood up and nodded solemnly: "Sure." The DNA on the cigarette butt is exactly the same as the DNA sequence left by the 721 suspect!"

"It's been eight years, and the eight-year-old case is finally coming to an end! Xiao Ran, I thank you first for the families of the victims of this case!" Lei Kang took a deep breath and slowly raised his right hand to salute Xiao Ran.

Xiao Ran didn't expect this case to have such weight in the hearts of the Lei team, and hurriedly said: "It's also a coincidence." ”

"Have you found out who left that cigarette butt?" asked Lecon.

"I'm not sure, but according to the manager of the company, it was the boss of their upstairs company who smoked a cigarette butt that fell on their company's balcony when it was thrown down from the balcony. ”

Xiao Ran hesitated for a moment and said, "But I heard the manager of that company say that the person who threw the cigarette butt should be surnamed Zheng ...... And I used to work in our system, and then I left. ”

"Ever been a cop?"

Lei Kang's brows furrowed, although the owner of the cigarette butt has not really been determined, but if it is really the former police officer surnamed Zheng who did it, then it can solve why the suspect back then had such a high anti-reconnaissance ability.

Peers, know your peers best!

"Don't tell anyone about this beforehand. ”

Lei Kang thought about it for a while, and made a decision in his heart, if the suspect really worked as a policeman, then he must have many acquaintances in the police system, if he ventured into an investigation, in case this person heard any rumors, then he would be alarmed and cause some unfavorable changes.

"You and Zhang Lei are most familiar with each other, the two of you go to secretly investigate this person surnamed Zheng and find a chance to get his DNA, after all, from a hearsay cigarette butt, you can't just hastily identify him as the perpetrator. ”

Lei Kang said: "I am signing a summons for you, and you can send it to the bureau for questioning if necessary." ”

"Understood. ”

Xiao Ran understood Lei Kang's thoughts, went out to talk to He Xiaoli, changed into civilian clothes, took Zhang Lei, a dog-legged, and drove his private car to the vicinity of the snack street.

"What are you doing here? You want to invite me to dinner, we haven't gotten off work yet......

Looking at the various delicacies on the snack street, although he had just eaten, Zhang Lei still swallowed his saliva.

"If you want to eat, you can eat, don't ask me to pay. ”

Xiao Ran said casually, at this time, he was searching for nearby positions on 58.com, and along the way he was thinking about how to find a reason to go to this Zheng's company, and he came to the door for no reason, which was too abnormal.

"I'd better forget it, my old man has cut off my financial resources, and now my salary can only feed me ...... food."

The more Zhang Lei talked, the more desolate he became, thinking that when he was in school, he was a rich man in the dormitory, of course, in Xiao Ran's low-key situation.

"Hey, what are you doing, you don't want to change jobs, do you?" Zhang Lei saw Xiao Ran checking nearby positions and exclaimed.

Xiao Ran glanced at Zhang Lei and said coldly: "Do you know how the villain died?"

"The villain died from talking too much, who doesn't know ......"

Zhang Lei is just a brain, he opened his mouth and said, but halfway through the words, he reacted, feeling that he was going to die soon.

"You wait here, I'll be back in a moment. ”

Xiao Ran looked for a nearby position for a while, and really let him find a job announcement from a company on the twelfth floor, but it was not Zheng's company.

But finally there is an excuse, isn't it?

Xiao Ran put on his shoulder bag and went directly to the twelfth floor, and coincidentally, the foreign trade company that posted the recruitment information was next door to Zheng's company.

Disguising himself as a job seeker, Xiao Ran pushed open the glass door of the target company, only to see that there were not many employees in Zheng's company, more than 30 people, all of them were busy nervously, and no one noticed him coming in.

This is exactly what Xiao Ran wants, he observed the company's position structure chart on the wall on the right hand, and the man in his thirties with a square face and thin eyes at the top is the boss of this company: Zheng Yang.

Looks like a very kind person.

"What do you do, handsome guy?"

After standing for a while, someone finally noticed Xiao Ran, and a young woman wearing a hip-wrapping professional uniform walked over and asked very enthusiastically.

Xiao Ran showed his smile that could kill thousands of women in seconds, and said softly: "Oh, I'm here for an interview, foreign trader, your personnel called me." ”

"Foreign trader?"

The woman was stunned for a moment, and then said with some disappointment: "You are coming to Wuchang for an interview, they are next door to us...... But you can also come to us to have a look, our company is much better treated than them!"

Coming out of the building, Xiao Ran sat back in the car: "Let's go, go to the public office hall." ”

"What the hell are you going to do?" Zhang Lei was still confused.

Xiao Ran took out his mobile phone and showed Zhang Lei the photo of Zheng Yang he took: "Go check this person's ......"