Perhaps it was affected by the previous "ghost crying", the moment he saw the black shadow, Ye Yu's whole nerves suddenly tensed! However, Ye Yu quickly forced himself to calm down, he tried to suppress the uneasiness in his heart, leaned over the monitoring screen, and carefully examined the figure.

The light in the video is dim, and the emergency lights can only shimmer a faint light in a small area at the entrance of the lecture hall, and the figure in the picture is facing away from the camera, seemingly holding something in his hand, searching inside the classroom.

"Who is this man? That's the ...... in your hand Flashlight? ”

A faint pillar of light passed through the glass of the classroom door from the figure's hand and projected into the classroom, although it was not very clear, but from the figure's movements, it was obvious that the other party was looking into the classroom through the flashlight.

Ye Yu watched the figure's every move nervously, but the other party seemed to be just casually looking at the door for a while, and did not enter the classroom, and after a while, the figure immediately turned around and left.

At this time, Ye Yu had completely calmed down, he squinted his eyes, and immediately operated the device to rewind the video, adjust the picture to zoom in and focus on the figure, and at the same time adjust the resolution.

"This man...... I always feel like I've seen ...... before? Ye Yu looked at the man's back and asked Xiaolu on the side with some hesitation.

"This person seems to be the same security guard who locked the door before, right?" Shinoru carefully recognized it for a moment, and then affirmed. "That's right, it's him, but he didn't wear a uniform at night, so he didn't recognize it just now."

"Indeed, by what you say...... But what was he doing at the door of the classroom so late? Ye Yu questioned.

"It's just a routine round, right? At the beginning, the head of the bald security section also said that they had gone to the door of the lecture hall that night to see it. There was no blood on the wall of the classroom at that time. Shinoru explained.

"That being said, why do routine inspections take place at 1 a.m.? And it suddenly appeared not long after that strange sound happened, and I always felt ...... It's a bit of a problem......" Ye Yu pondered. Move your gaze to the figure in the frame again. "I wonder what the hell is he looking at in the classroom......

"This is easy to do, just let the bald head explain it." Shinoru smiled and suggested a straightforward solution.

Five minutes later, the bald head of the security section reappeared in the security room.

"What are your orders, two chiefs?" The bald man said with a flattering smile on his face. "If you need my help, just say it. I will definitely help the two of you with all my heart, and I will never give ......up."

"Alas, enough is enough......" Ye Yu shook his hand. Interrupting the bald man's exaggerated compliment, he turned to point to the figure in the freeze-frame video frame. "Who is this person in the surveillance video? Since you've seen the footage, you should have noticed it a long time ago, right? “

The bald man was stunned for a moment, and hurriedly glanced at Ye Yu's point. Then his expression relaxed. said with a smile: "This, it's our security guard on duty Xiao Wang, he happened to be on night duty that day, just a normal patrol." ”

"Oh? Your usual patrols are at one or two o'clock in the middle of the night? ”

"Uh...... Also...... It's not conventional...... Just come and see when something happens......" The bald man smiled awkwardly, but his eyes flickered.

"'When something happens'?" Ye Yu noticed that the other party's expression was a little unnatural, and immediately asked. "So that means there was a situation in the classroom that night?"

"No, no! Actually, it's not a big deal. The bald man hurriedly waved his hand, and then seemed to be afraid that Ye Yu would misunderstand something. Again hastily added. "Don't doubt our security! As you can see, he didn't enter the classroom. And according to him, there was indeed no blood on the wall of the classroom at that time......"

"I'm not suspecting you security guards of any bad things, just if you're deliberately hiding something from us...... Then we can't help you. Shinoru stared at the bald man, but the sweet smile provoked the latter to break out in a cold sweat.

"No, no, I really didn't deliberately hide anything, I just ......" The bald man struggled for a while, but after all, he couldn't resist the sharp eyes of the knife hidden in Xiaolu's smile, and finally disarmed and surrendered.

"Actually...... that night The smoke alarm in the lecture hall went off ......," the bald man explained, bowing his head.

"Smoke alarms? Was there a fire in the classroom that day? Ye Yu suddenly thought of the "ghost cry" that he vaguely heard in the video before, could it be the sound of a smoke alarm?

"No, no, that's actually a false positive." The bald man hurriedly shook his head. "The lecture hall has been equipped with smoke alarm devices for a long time, as long as there is an open fire in the classroom, the alarm will be triggered, and the sprinkler head will be turned on to spray water mist to extinguish the fire, but this device seems to be a little broken, sometimes there is no fire and it will automatically alarm and sprinkle water, but not many times, only a few times."

"If there's something wrong with this device, why don't you go and fix it?"

"Well...... Forehead...... The principal did ask me to arrange for a maintenance company to repair the ...... It still seems to be a bit of a problem, though. The bald man looked away again, but this little gesture couldn't hide Xiaolu's eyes at all.

"Heh, in my opinion, you didn't find a regular company to repair it in order to be greedy for the maintenance fee allocated by the school, right?" Shinoru stared at the bald man and said sharply.

"Uh, that...... Hehe...... Sure enough, I still can't hide it from you, sir, I actually just want to make some extra money, but I didn't expect that the private maintenance worker I found was not reliable at all......" The bald man looked at Ye Yu and the others pitifully with a chagrin expression on his face.

"I didn't tell the principal about the false alarm that night, and the sprinkler water dried up the next morning, so no one found out...... But don't tell the principal! Otherwise, he will definitely come to me, and my job will be ruined by then......"

Ye Yu shook his head, too lazy to talk nonsense with the bald man again, he fast-forwarded the video again, but until the next morning, when the security guard came to open the door, no one appeared at the door of the lecture hall.

And then. When the security guard opened the door of the lecture hall in the morning, he found that there were words on the wall? Ye Yu looked at the security guard who panicked as soon as he opened the door in the video, and asked the bald man.

"Yes, except for our security at the time. A few teachers passing by also saw it, and the red paint on the wall had already dried, so it should have been written for a while......," replied the bald man.

"That is to say, when the door of the lecture hall was locked all night, these 'blood letters' appeared on the wall of the classroom itself, and it was after the midnight security patrol......" Ye Yu thought and turned his head to look at the bald man. Is there only one entrance to that lecture hall? Are there back doors and windows or anything like that? ”

"Because of the central air conditioning, the windows of this lecture hall are closed. There is also no back door, so the classroom gate is the only entrance. ”

"Are there any vents in the classroom?"

"Yes, there is, but the vent is in the ceiling. Not to mention the iron fence outside, it is still very small, and even a child can't get in, so it is impossible for anyone to enter the classroom from there. ”

"So it seems. It's basically a secret room......" Ye Yu muttered. I was also confused in my heart.

The classroom was cleaned and locked, and several people present could witness that there was no writing on the wall at that time, and the only passage was that no one entered or exited all night, so it was possible to sneak into this secret room in the middle of the night to write, and the only one who could escape with his whole body was ......

"Yutang's soul must still be roaming around us, wanting revenge on those who hurt her!"

Somehow, Chen Xin's crying echoed in Ye Yu's mind over and over again. He shook his head. Trying not to be affected by Chen Xin's statement, he turned to the bald man and said after taking a deep breath:

"That's right. I've heard you say that the 'blood letters' on the wall aren't actually written in blood, do you know what kind of material it is? ”

"It seems to be some kind of paint, I don't know the specifics......" said the bald man. Speaking of which, this thing is quite laborious to clean up, the more you wipe it, the more red it becomes, you can't get it clean, and it's very infiltrating! I almost missed the big event......"

"'Delay a big thing'? What's the big deal? Ye Yu asked.

"In fact, on the afternoon of the accident, the leaders of the district education bureau came to hold a meeting, and the location was in the lecture hall...... That's why the principal was very angry and ordered me to get the prisoner out quickly. ”

"Is that lecture hall still in use?"

"The words on the wall are so scary, how dare you use it, the principal plans to repaint the wall after finding out the culprit next week, but before that, the classrooms were locked, and no teachers and students were allowed to enter after the accident."

Is that so? Maybe......

Ye Yu thought for a while and said to the bald man: "I want to go and see the scene, is it okay?" ”

"Of course, of course!" The bald man said earnestly. "It's just that the wall has been cleaned by us, and it's still a little different from the original scene......

"It's okay, you can take us there, right now." Ye Yu said, gesturing to Xiaolu. "Maybe there are other clues on the scene, don't you think?"

"Hmm...... Perhaps. Shinoro's eyes were still focused on the video footage, which showed a large group of students surrounding the classroom door, as well as a middle-aged woman who was angrily driving away the onlookers.

"Is this the female teacher reprimanded in the bloodline?" Shinoru pointed to the middle-aged woman in the video and asked the bald man.

"Oh, you said Teacher Lu, that's right, it's her who is scolded in those bloody words on the wall." The bald man glanced at the video and nodded.

"Many students have rumored that this incident was made by the ghost of Lin Yutang, who jumped off the building in your school, just to take revenge on this female teacher, as the head of the security section, what do you think?" Shinoru moved her gaze from the video to the bald man's face.

"Alas, I can't say anything about those gods, but if that classmate Lin really turns into a ghost to retaliate, hehe, then I don't think Mr. Lu can escape." The bald man smirked. "There is some information, but only I, the head of the security section, know it, such as ...... About that Lin Yutang's death. ”

"What did you say?!" Ye Yu was taken aback and looked at the bald man in surprise.

"Hmph, you seem to know everything." Xiaolu heard that the bald man was planning to sell Guanzi, so she deliberately pretended not to believe it.

"I really know, I saw it with my own eyes!" Xiaolu's agitation method really attracted the bald man to hurry up.

"That Lin Yutang's death actually has another inside story!" (To be continued.) )