Hu Yitong did not react at the first time, so he calculated for two or three seconds in his mind before finally nodding.

"Let me give an example." In order to confirm, Zhou Yan said again: "That is... If you check in at 6 am on the first day and check out at 12 noon on the next day, then you will stay for 30 hours. In this way, the system will charge a one-day room fee.

But if you check in at 12 o'clock in the middle of the night on the first day and check out at 12 noon on the second day, you have to pay the room fee for one day, but you only stayed for 12 hours.

There is a total of 18 hours between the two, but they are all one day, right?"

Hu Yitong nodded and said, "That's right. Although it sounds a bit unreasonable, all hotels are calculated like this, the system stipulates it!"

Indeed, in the world before Zhou Yan’s rebirth, it was also charged for hotel stays.

And this seemingly unreasonable system regulation, if you move your hands and feet, you can spend several hours or even a whole day out of thin air.

In this way... the key point of locking the murderer is not the method of committing the crime, but the time of committing the crime!

Zhou Yan looked at Hu Yitong: "Now I want to ask you a very important question, you must answer it carefully."

"Uh..." Hu Yitong seemed to suddenly become nervous.

"Did you see Boss Wang and Boss Wu this morning?" Zhou Yan asked.

"This... I went to wash the quilt after I woke up in the morning. I didn't pay attention. However, these two people drank until early in the morning every day. I guess they were drunk in the morning."

Zhou Yan nodded... Without saying anything, he walked out of the door

Xiao Chen outside the door was still confused, and when he saw the relaxed expression on Zhou Yan's face, he was even more confused.

"Zhou...Detective Zhou, what happened?" he asked tentatively.

"Oh, nothing, I just found the murderer."

"Oh, I found the murderer, I thought...what?!!!" Xiao Chen was stunned: "Have you found the murderer?"

"Shh~" Zhou Yan quickly made a gesture: "Don't be so loud, it's just logically understandable, and it's not completely certain."

"How can you be sure?"

"Uh... can we collect blood here?" Zhou Yan asked.

"Yes, but the equipment on site is not complete, so you can only do the simplest test."

Zhou Yan thought for a moment: "If a person takes sleeping pills, can he find out?"

“This should be possible.”

"That's easy..." Zhou Yan rubbed his dizzy head and tried to be as clear as possible: "Then... please call all the suspects together. If it goes well, we can find the murderer before the police station laboratory."

Just finished speaking...

"Okay!" Xiao Chen ran to prepare.

......

At around 11 o'clock, the hotel restaurant was full of people.

Those sitting in the outer circle were all from the evidence collection team and the police.

And the inner circle, the suspect in this case is sitting...

They are Wang Boss, Wu Laoer, Zhang Jianguo, Zhao Fugui, and Hu Yitong.

As for Zhou Yan, he walked past the tables, chairs and benches in the restaurant and came to the five suspects...

"Well, it seems that everyone is here..."

"What are you calling us here for?" Zhang Jianguo was a girl after all. Seeing so many policemen surrounding him, he was a little scared and held his boyfriend Zhao Fugui's hand tightly.

"Don't be nervous." Zhou Yan comforted: "It's just a sign that the murderer is."

"What?" Zhang Jianguo was stunned, then looked at the people around him: "So..."

"Yes, the murderer is among you five!"

Zhang Jianguo seemed to be even more nervous...

So, before pointing out who the murderer is, please allow me to do an experiment.

"What kind of experiment?" Wu Laoer asked.

"Blood collection..."

"Who did you pick?" Boss Wang asked.

"your."

"Ah?" Boss Wang was shocked: "My? Why did you pick me? I didn't kill anyone!"

"We will know whether to kill someone or not, just collect blood." Zhou Yan said.

"I, I..." Boss Wang was obviously nervous: "Can I refuse?"

"No." Xiao Chen interrupted.

Before he finished speaking, a person from the evidence collection team came over, took a needle, and signaled Boss Wang to stick out his arm obediently.

Boss Wang had no choice but to do it.

The needle was inserted into the blood vessels, and the bright red plasma was pulled out... Everyone was nervous about the process. Although they didn't know what Zhou Yan wanted to find in the blood, the blood was obviously the key to identifying the murderer.

Soon, the blood was collected and the five suspects were in a very nervous mood.

"So, who is the murderer?" Wu Laoer asked again.

"Don't worry, reasoning should be done slowly." Zhou Yan said: "First of all, I would like to ask everyone here, what day is today?"

"No. 14." The first person to answer the question was Wu Laoer.

The rest of the people also took out their phones and confirmed the day.

"Well, it's indeed No. 14." Zhang Jianguo and others also replied.

......

"That's right! It's the 14th today." Zhou Yan said in a summary.

But... no one thinks there is a problem with the date?

"Date? What's the problem with the date?" Boss Wang asked with a cotton swab pressing the pinhole on his arm.

Zhou Yan turned his head and looked at Boss Wang...

"Other people's dates may not be problematic, but only yours is problematic."

"Me?!" Boss Wang was shocked.

"That's right! There's something wrong with your date. Because you said in your testimony that you've been here for five days, including today."

Speaking of this, Hu Yitong, a hotel waiter, had to interrupt.

"Uh... Detective Zhou, you remembered it wrong. We went to the computer before and saw Boss Wang's room. It was indeed five days since we checked in, that's right."

Zhou Yan nodded with a smile: "That's right, the number of check-in days displayed in the hotel system is five days, but it is precisely because of this that Boss Wang's description has problems.

Because he said that he came to check-in with Wu Laoer at six or seven o'clock that morning.

Because of the hotel system, its room rate settlement time is noon the next day!

Therefore, the [five days of stay] displayed on the hotel system should be six days of stay under the normal senses.”

"Six days?" Boss Wang probably also said that because he drank too frequently in the past few days, he fiddled with his fingers: "Have I lived for six days? No, I clearly remember it was five days."

"Okay, don't forget it." Zhou Yan said: "If you count it according to sunrise and sunset, you have indeed stayed in this hotel for six days."

"But I'm not lying!" Boss Wang shouted: "I really feel like I've only lived for five days."
Chapter completed!