The soft sunset at dusk shone on the alley of Chen Yiyan's office. Chen Yiyan had forgotten how he got back to the office, the scenery and people on the road couldn't rob his attention, and he didn't know if he was thinking about the case or Yu Yuqian along the way.

"Gollum." Chen Yiyan was hungry, and eating a bite in one day would indeed make a "heavyweight" like him unbearable. Chen Yiyan entered his bedroom from the office, opened the refrigerator, and the contents were almost eaten, and what stood in front of Chen Yiyan's eyes was the small canned fish that Yu Yuqian brought him. This small can of fish stirred Chen Yiyan's mind again, or rather, he never stopped thinking.

Chen Yiyan was stunned for a while, took out the canned fish, walked to the edge of the bed and sat down. He also did not wash his hands. I just opened the can and took out one and took a bite, and it tasted good. After eating a few small fish, the canned food was already halfway through, and Chen Yiyan was still a little hungry. But now this feeling of hunger is as much as he can accept.

Put back the canned fish, come to the bedside, and habitually smoke the tissue. But Chen Yiyan's fingers didn't touch the feeling of paper towels, Chen Yiyan turned his head to look at the tissue box, and indeed there were no paper towels in the tissue box. But there was one thing that caught Chen Yiyan's attention, and that was a doll placed next to the tissue box.

That doll was the doll of the rose-colored maple moth that I had taken over from the previous case. This doll Chen Yiyan actually wanted to give it to Yu Yuqian, but at this moment he was at the point where he felt that he had no chance. Chen Yiyan stood up, washed his hands, wiped off the water from his hands with a towel, and wiped it on his body again. Picking up the doll with a love story, Chen Yiyan walked out of the door of the office, in fact, there was a room opposite the office on the second floor. When Chen Yiyan rented this place, he rented it with the office, but Chen Yiyan didn't need such a big place alone, so this room was usually a place for him to put his sundries.

Chen Yiyan opened the door opposite the office, the space here is actually about the same size as his bedroom, it should be said that this is a bedroom. There are showers and toilets, but no one has used them for a long time, and a layer of dust has accumulated inside. said that it was a utility room, but in fact, Chen Yiyan didn't let go of the sundries, but he didn't come in again since he came in on the day he rented it.

There was an iron bed frame in the bedroom, Chen Yiyan looked at the doll in his hand and thought for a while, and then he returned to the office. After rummaging through the office for a while, he found a box, and he put the doll in it, maybe he was afraid that the doll would be dirty, or maybe Chen Yiyan was still looking forward to giving away the doll in his heart. Chen Yiyan put the box containing the doll on the bed frame and turned back to his bedroom.

Chen Yiyan put his hands behind his head, and his phone played psychedelic soft music. He began to think about the details of the case, but somehow Yu Yuqian's face always appeared in front of his eyes. Chen Yiyan shook his head, sat up straight, and turned off the song on his phone. He opened the case-related photos Ji Ping had sent him and began to keep himself busy.

One o'clock in the morning, inside the Haishi Hotel.

Yu Yuqian had a busy day, and today she almost ran all over the entire Haishi District 1. She is allergic to ultraviolet rays, and she is fully armed when she goes out, but it is summer. So when Yu Yuqian goes out, it will make her so hot that she can't do it.

After returning to the hotel, the first thing Yu Yuqian did was to lie down. She turned on her phone, and there were a number of messages and unread messages. As a model who occasionally takes orders, Yu Yuqian also has her own short video account, and she took a video and released it today. Yu Yuqian swept through some vulgar comments, replied to some friends' comments, and then played the playlist and let it go for a while.

Yu Yuqian took off her sunscreen clothes, and inside was a silver low-waisted dress. Yu Yuqian's figure in the mirror is revealed, Yu Yuqian's figure is very good and beautiful. After removing her makeup, Yu Yuqian, who was without makeup, revealed her cheeks, which were still a little immature. Yu Yuqian turned on her mobile phone and began to liquidate today's consumption and her future plans.

On the other side, Chen Yiyan in the office still didn't fall asleep. There are many strange things about this case, for example, the testimony of the victim's wife is a little wrong. However, it is normal for Li Qinlan, who has experienced great grief, to have such vague statements. Then the environment of the villa area also made Chen Yiyan feel a little strange. The surveillance in the villa area is relatively tight, Ji Ping told him that the murderer escaped all surveillance and entered the victim Zhang Sen's home. A person who writes a threatening letter can have this kind of ability, Chen Yiyan doesn't believe it, because from a psychological point of view. The party who writes the threatening letter is often the weaker party. They will only do it when the two sides are torn apart and quarrel, let alone come to the house of the threatened party to quarrel.

It only depends on whether the plan can be implemented. Chen Yiyan turned off the light, strongly suggesting that he was going to sleep.

It was dawn, and at five o'clock in the morning, Chen Yiyan had already woken up, and he didn't sleep well last night. I don't know if I'm bothered by the case or Yu Yuqian's matter.

Chen Yiyan has already washed his hair, and he is ready to go out for a run today. Chen Yiyan hasn't exercised on an empty stomach for a long time. When he went out, he looked at Yu Yuqian's desk, and the pink mug on the desk hadn't been touched for six days.

Chen Yiyan looked at it for a while, swept away the emotions in his mind, and Chen Yiyan walked out of the office.

This road is a small road to the south of the office, and because it is located in the suburbs, there are still many vegetable patches and vegetation areas near this area.

Even in the morning, it was hot. Chen Yiyan, who hadn't been running for long, was already sweating a lot. He stopped to rest in a residential area.

At six o'clock in the morning, many people in the residential area have already begun to prepare for work. A couple came out of a residential building next to Chen Yiyan, and after the two were intimate for a while, the man drove the battery car and the woman behind Chen Yiyan. Chen Yiyan may have been stimulated by this scene, but what he was thinking in his mind at the moment was, 'I don't even have a battery car.' Chen Yiyan shook his head, and the sweat of the bean was scattered to both sides.

At nine o'clock in the morning, at the entrance of Haishi University. Chen Yiyan had already arrived, and he saw two police cars coming.

A number of police officers got out of the police car, including Ji Ping and Xiao Zhao.

"So early?" Ji Ping was different from the last time, this time he wore a police uniform.

"Did you post the news?" Chen Yiyan asked.

"I didn't inform the media, but the school is willing to cooperate, and they will have a school-wide briefing at noon today." Ji Ping had already contacted the school yesterday, and the school also expressed its full support for the police in handling the case.

"Okay, do you remember the victim's class schedule?" The last time he came to school, Ji Ping got Zhang Sen's class schedule.

Ji Ping took out a piece of paper from his pocket: "I printed it." ”

Professor Zhang Sen does not have many courses, more than 10 classes a week.

"Well, wait." Chen Yiyan nodded and spoke.

Just after noon, the school announced that Ji Ping wanted the school to inform him. For a while, the students in the school were all talking about it, they knew about Professor Zhang Sen yesterday, and now the school reported that the murderer had sent a threatening letter to Professor Zhang Sen, and it was very likely that he had come into contact with Professor Zhang Sen in the school.

Chen Yiyan stood in the corridor of the teacher's office, and he watched the people coming and going downstairs, and the students who were in and out of class.

Ji Ping expressed his gratitude for the school's cooperation in the office, and then came behind Chen Yiyan: "What are we going to do next?" ”

Chen Yiyan remembered that Professor Zhang Sen had two classes this afternoon, one was a professional course and the other was an elective course.

"Listen to the class." Chen Yiyan turned around and smiled at Ji Ping.

The music sounded, and it was the bell for classes at Haishi University.

"Okay, students, this semester's business administration course is up to me." Speaking on the podium was Dean Huang.

The students below did not speak, and Dean Huang glanced at the students below and began to class: "Yesterday we talked about... ”

In the classroom, Dean Huang was in class, and Chen Yiyan and Ji Ping were watching outside the classroom. Some students noticed some people in police uniforms outside the classroom and told each other.

"You said that the police came to our school to investigate the case, is the murderer among us?"

"Don't talk nonsense, take good classes."

"Didn't the notice say that someone wrote a threatening letter to Mr. Zhang!"

"Huh? Teacher Zhang is so good, how could someone write a threatening letter to him! ”

The classmates whispered.

Chen Yiyan watched the reactions of these students, he deliberately made Ji Ping and them stand in a position that was not obvious but could be discovered. It was a stress test, and he wanted to see if any of the students were unresponsive.

"What did you find?" Ji Ping was also watching the students' reactions.

Dean Huang on the podium finished talking about a concept and saw Ji Ping and the others, and he nodded to Ji Ping and them. This time I came to check outside the classroom, and Dean Huang communicated with it.

"Look at the one in the middle of the first row." Chen Yiyan pointed to the boy: "The students around him are all talking, and he hasn't changed in the slightest from beginning to end." ”

Ji Ping looked at the student in the middle of the first row.

"And the guy closest to the window." Ji Ping looked in the direction Chen Yiyan pointed again: "He didn't react either." ”

Ji Ping noted down the two students, and the class in the classroom continued, and Chen Yiyan and the others were still watching outside the back door of the classroom.

The music started again, and the class ended.

"Alright, that's the end of the lesson." Dean Huang paused and continued: "You should all know about Teacher Zhang, there will be police in the school to investigate the case, you should cooperate well." ”

"Got it, teacher." The students replied.

Dean Huang walked out of the classroom door and met Ji Ping.

"How? Did you find anything? Dean Huang asked, "Our students are good students, and I'm sure they won't be involved in this kind of thing." ”

"There are no hairstyles, and the students are all acting normally." Chen Yiyan said before Ji Ping spoke.

Ji Ping glanced at Chen Yiyan, although the two people Chen Yiyan said made him feel a little strange, but Chen Yiyan must have his reason for saying this: "Yes, Dean Huang, I also believe that your students will not do this kind of thing, but we still have to do it routinely, and the case must be investigated thoroughly." ”

"Well, I hope you find out sooner." Dean Huang expressed his understanding.

After the two sides talked, they said goodbye.

"What did the two suspicious students say?" Ji Ping looked at the students who were leaving the classroom one after another and asked.

"I looked at it later, and the middle one in the first row should be the so-called Xueba. I don't care who the teacher is, I only care about whether I can teach competently. So he's really just listening to the lectures. Chen Yiyan watched the boy take his notes and put them in his schoolbag and leave the classroom: "But it's not necessarily, you still send someone to inquire." ”

Ji Ping immediately asked a police officer behind him to investigate.

"As for the one closest to the window. He had been in a chin position with his left hand on his left hand since before we arrived, thirty-four minutes later. He turned his head to look at us, and the expression on his face was a little surprised. This means that he hadn't heard the students talk before, so he didn't know we were coming. This proves. Chen Yiyan turned his head to look at Ji Ping: "This proves that he was asleep before." ”

"I'd better send someone to ask." Ji Ping said.

"Well, it's just my guess, after all." Chen Yiyan did not observe the girl because the victim's wife's confession was a man's voice. There are thirty-three students in this class, Chen Yiyan has counted them, there are a total of eighteen boys, and in more than an hour, it is enough for Chen Yiyan to observe all the boys' external performance several times.