When we arrived at the interrogation room, I saw Wang Chenxi sitting inside through our glass, Wen Jinnan hurriedly ran over and told us that he had verified Wang Chenxi's identity, and what he said was true, and Sun Xin was indeed his teacher when Wang Chenxi was abroad.

Wang Chenxi in the interrogation room has been rubbing his hands anxiously, looking at his expression is very panicked and puzzled, he said that he saw Sun Xin last night, but why did the waiter at the front desk of the hotel say that except for Hua Guanwen, no one had seen Sun Xin on the night of the crime.

I asked Song Chi for permission and wanted to talk to Wang Chenxi, Song Chi nodded and let me in, Wang Chenxi in the interrogation room saw me leave and stood up, and asked with a stern expression.

"What happened to Mr. Sun? I went to the teacher today, and the hotel guy told me that the teacher was ......"

I motioned him to sit down and not get excited, I asked him why he wanted to see Sun Xin last night, Wang Chenxi slowly sat down in the chair and told me that after graduation, he had been in contact with Sun Xin, and his major was also mental illness treatment, but after returning to China, he entered the pharmaceutical factory to be responsible for the production of psychotropic drugs, because there were many academic questions to ask Sun Xin for advice, so the exchanges were particularly frequent.

Wang Chenxi was very happy and excited to learn the news of Sun Xin's return to China, because Sun Xin brought back the latest scientific research progress report on the research and development of drugs for the treatment of mental illness for him this time, which was of great help to Wang Chenxi's work.

Wang Chenxi went to visit Sun Xin last night, one was to visit the teacher he hadn't seen for many years, and the other was to ask Sun Xin for advice in person and get back the scientific research progress report, but when he arrived at the hotel, he was told by the front desk that he needed to make an appointment in advance to meet him, and Wang Chenxi realized that he was so happy that he forgot to get in touch with Sun Xin in advance.

Wang Chenxi originally planned to go back first, and wait until tomorrow to visit Sun Xin, but when he passed by the back alley, he was knocked down by a woman who suddenly came out, and when he looked up, he saw that the person who knocked him down turned out to be Sun Xin.

"You saw Sun Xin outside the hotel?!" I was stunned for a moment and hurriedly asked. "Do you remember what time it was?"

"......," Wang Chenxi replied hesitantly after thinking for a moment. I arrived at the hotel at about ten o'clock in the evening, and since I couldn't see the teacher, I had a bite to eat next to the hotel, and I left about ...... It must have been around eleven o'clock. ”

The time is basically the same, the hotel front desk said that Sun Xin after Hua Guanwen left, came down to ask for a change of door card, and then left the hotel, as for when she came back, it is not clear, I think Sun Xin is Wang Chenxi who went out to meet at that time.

"And then, you've been with Sun Xin?" I pressed on.

Wang Chenxi nodded and said that he recognized Sun Xin at a glance when he helped Sun Xin up, and he was really overjoyed at that time, Wang Chenxi was still worried about whether Sun Xin was injured, but ......

Wang Chenxi was a little puzzled when he said this, frowning and wanting to speak.

"But what?" I asked anxiously.

"Teacher, she doesn't seem to remember me, I think it should be because I haven't seen each other for a long time, after all, I have been away from her for many years." Wang Chenxi said thoughtfully. "When I called the teacher, she looked at me a little blankly and asked me, who are you?"

"Sun Xin doesn't remember who you are?" I rubbed my forehead and asked after thinking for a long time. "You have kept in touch with Sun Xin since you returned to China?"

"Yes, there has always been a connection, because there are a lot of academic issues that I need to ask the teacher." Wang Chenxi nodded and said with certainty. "But...... I guess the teacher hasn't seen me for a long time, after all, we contact me by email, and it's normal that she doesn't recognize me. ”

"Are you sure you're seeing Sun Xin?" I'd like to be sure again.

Wang Chenxi nodded without thinking, he told me that Sun Xin should not have a good memory at that time, his expression was a little indifferent, there happened to be a tea party next to him, Wang Chenxi took Sun Xin in to rest, it may be that the accident just now made Sun Xin a little frightened, Wang Chenxi mentioned the previous thing with Sun Xin abroad, but Sun Xin's reaction was not too strong, but when Wang Chenxi inadvertently mentioned the topic of psychiatric treatment, Sun Xin immediately showed concentration and seriousness, and the conversation became normal, after all, he is a first-class authority in the field of psychiatric treatment, Wang Chenxi nodded convincingly as he spoke.

He said that although he and Sun Xin did not talk for a long time, listening to what Jun said was better than reading for ten years, which benefited him a lot.

Hearing this, I can be completely sure that Wang Chenxi saw Sun Xin, I asked him what happened later, Wang Chenxi thought about it and began to rub his hands again, telling me that he and Sun Xin had not been talking for a long time, during which Sun Xin had been looking at the time on the wall, and was still holding a piece of paper folded together, Sun Xin didn't know why when chatting, it seemed that he was tearing the paper very casually, until it was torn to pieces.

"I think the teacher is really old." Wang Chenxi sighed heavily and said. The teacher tore up the paper and threw it in the trash, but after a while she searched everywhere again, as if she couldn't remember what she had done before.

"......" I frowned, feeling that according to Wang Chenxi's description, Sun Xin was a little absent-minded at that time, or as Wang Chenxi was worried, Sun Xin's memory deteriorated very seriously.

Wang Chenxi then told me that he saw that the time was not too early and planned to send Sun Xin back, and when he left, he asked Sun Xin to wait first, and he went to the bathroom, but when he came out, he found that Sun Xin had left the tea house, and Wang Chenxi turned around and chased him out, and he never saw Sun Xin again.

Wang Chenxi was worried that Sun Xin had a bad memory and might have something very important to remember on that piece of paper, so he turned around and returned to the tea house, picked up all the paper flowers torn by Sun Xin from the garbage basket, and wanted to piece them together and exchange them for Sun Xin, but he was worried that the things inside were Sun Xin's, and it was inconvenient for him to check them, and another reason to visit Sun Xin today was to return the shredded paper he picked up to Sun Xin.

"Do you still have those shredded papers?"

"Yes."

Wang Chenxi took out a piece of shredded paper wrapped in a plastic bag from his coat pocket, I looked at the glass in the interrogation room, I thought Song Chi must have been watching everything that happened in the interrogation room outside, and he should understand my eyes.

Sure enough, Song Chi soon came in from outside, and I handed him the plastic bag.

"Arrange for someone to restore these shredded pieces of paper and see what's on them."

Song Chi nodded and went out with the shredded paper in the plastic bag, and I took a deep breath and said to Wang Chenxi with relief.

"I hope you have a mental preparation, your teacher Sun Xin was indeed killed last night, as for the reason, it is inconvenient for the police to disclose it for the time being."

When Wang Chenxi heard this, the whole person was suddenly stiff and stunned on the other side, looking at his expression full of sadness, presumably the teacher-student relationship between him and Sun Xin was not shallow, and the tears couldn't hold back from his eyes at all.

"Condolences and change." I didn't know how to comfort him, so I sighed.

"Can you let me see the teacher again?" Wang Chenxi looked at me with a sad voice and asked.

It stands to reason that this is not allowed, but I can understand his mood at the moment, sighed silently in his heart and finally nodded, because I was worried that Wang Chenxi would see the truth about Sun Xin's death, and when I took her to the morgue, I asked him to wait at the door first, and then went in first to let Lao Yang drag the body out, and the zipper could only see Sun Xin's face, I just beckoned Wang Chenxi to come in, he only glanced at it and burst into tears on the spot, I didn't know what to say next to me, maybe I saw too much life and death, Just stood silently next to him.

Sun Xin should have returned to the hotel after separating from Wang Chenxi and was killed, and according to Wang Chenxi's description, it basically coincides with the time of Sun Xin's death.

"At that time, I said that I would wait for you to send you back every night, and I blamed me for not going to the bathroom, otherwise you wouldn't have ......," Wang Chenxi said with a sigh while crying bitterly. I didn't have to drag you to talk for so long, you kept looking at the time past one o'clock in the morning, and I didn't even think to send you back first. ”

I didn't mean to urge Wang Chenxi, after all, it was yin and yang apart, seeing that he had a lot of feelings for Sun Xin's teachers and students, it was the last time to catch up with Sun Xin, I still lowered my head, and suddenly looked at Wang Chenxi in a daze.

"Wait! What did you just say? I asked, surprised.

"What time is it?" Wang Chenxi was completely immersed in grief and looked at me blankly.

"You just said one o'clock in the morning? You were still with Sun Xin at that time? I looked at Wang Chenxi dumbfounded.

"It's half past one in the morning, and I went to the bathroom when the teacher was leaving, and I just had a good look at the time." Wang Chenxi nodded and said with certainty. "I haven't seen the teacher for too long, and I talked about the topic of psychiatric treatment, and I feel that I have heard the teacher's teachings again, and I have forgotten that it is too late."

The corners of my mouth squirmed, and I swallowed saliva involuntarily, Sun Xin's body was found in a hotel room, and the time of death could be determined from the degree of digestion of food in the stomach and the temperature of the liver, and it was absolutely impossible to exceed twelve o'clock.

"Are you sure you read the wrong time?" I asked, confused.

"Of course not." Wang Chenxi said as he took out his mobile phone, flipped through a photo and handed it to me. "This is a photo of me and the teacher last night, I wanted to keep it for the record, but I didn't expect it to become a stunning photo, you look at the time on the wall behind us, because the café closes at two o'clock in the morning, and the waiter came to tell us that there will be no mistake."

I looked at the photo on the phone with shocked eyes, it was a photo of Sun Xin and Wang Chenxi, I subconsciously looked at Sun Xin who died next to me, and squirmed in horror Adam's apple, Sun Xin had died at twelve o'clock in the evening......

Who appeared in Wang Chenxi's photo at half past one in the morning?!

Song Chi walked in from the outside and handed me a piece of paper that had just been spliced by someone in his hand, which was the shredded piece of paper that Sun Xin had picked up from the garbage basket by Wang Chenxi.

"A plain letter on a piece of paper, and there is no writing on it." Song Chi shook his head and said disappointedly.

I took it and looked at it, and I couldn't find a word on the blank letterhead, but when my eyes fell on the sign in the lower right corner, my brow suddenly furrowed even deeper.

It was a statue of Nuwa, exactly the same as the one at the entrance of Hede Medical College, this was a piece of letter belonging to Hede Medical College, I looked at the sign blankly, and suddenly realized that Sun Xin's death may not be as simple as we thought.