Gu Wenyu didn't have the key to the rooftop, so she casually walked into a classroom where there was no one, and then stood by the window, first looked at the pipe next to her, and then looked at the height from the ground here, she only felt dizzy.

Although she had just climbed the water pipe to eavesdrop in someone's bedroom, it was only the second floor after all. It's an eight-story building, and if you fall down, you'll die.

Gu Wenyu shuddered, and then retreated silently, she felt that her life was still important.

If you don't climb the pipe, your life will be saved, but the demonic energy is emitted from the rooftop, how can Gu Wenyu investigate if she doesn't go up?

This is a paradox at all, Gu Wenyu paced back and forth, she finally decided to go to the vicinity of the gate of the rooftop first, even if she wanted to climb the pipe to the rooftop, she had to choose a shortcut.

So Gu Wenyu went up the last staircase to the top floor, it was pitch black, and the door to the rooftop was locked.

But looking at the door lock carefully, Gu Wenyu was happy. The two doors were closed from the outside in, and a large thick iron chain was attached to the two doorknobs, with a large lock in the middle.

This chain lock will be used, probably because the original door lock is broken. If there is only a chain lock, there will be a small gap in the door if you push it a little, and people can't get through, but cats can.

Gu Wenyu leaned over to the door and pushed it, but when she found that she couldn't push it, she looked up, and then jumped up again, trying to reach the doorknob.

I don't know if it's because the black cat's body is too light, and the doorknob can't be twisted at all.

Gu Wenyu turned his head and looked around, making sure that there was no one.

So, in the dark, the black cat suddenly turned into a human girl.

Gu Wenyu, who had regained his human form, immediately twisted the doorknob, this door was estimated to have been useless for a long time, the door locks were a little rusty, and Gu Wenyu took a lot of effort to twist the door lock.

It's done!

Sure enough, this door only has a chain lock!

Gu Wenyu pushed the door out, a gap appeared between the two doors, Gu Wenyu's face was happy, and then changed back to the shape of a black cat.

It is said that cats are made of water, as long as the head can pass, the body can pass. Xiao Hei was not fat, such a big gap, Gu Wenyu gently got into it.

The demonic aura on the rooftop is thicker than below, but it is still much weaker than the crime scene.

This place was empty, and you could see the end at a glance, and Gu Wenyu didn't find the shadow of the demon clan.

But the demonic energy here can't be faked, and there are no murders, and there are no demons, so where does the demonic qi come from?

The empty school rooftop, there was nothing, there was not a single lamp, the cold moonlight was sprinkled, the whole school was quiet and terrible, only a cat stood alone on the rooftop.

The cold wind was blowing, Gu Wenyu couldn't help but shiver, thinking about it carefully, the current scene was really a bit gloomy, she was a cat alone, and she was really a little stunned.

At this time, there was the sound of footsteps in the stairwell, and there were echoes in the empty corridor, which was particularly terrifying in the teaching building at night.

Gu Wenyu didn't care so much, and went directly to the dark corner. This is her advantage as a black cat, as long as the other party doesn't look carefully, it is impossible to find her at all.

"Da-da-da-da. The footsteps were getting closer and closer, and Gu Wenyu's heart also raised his throat.

"Click, click. "It was the sound of the lock being opened, and then the chains being removed.

It seems that this person is running for the rooftop, is it difficult for Mr. Zhu?

Gu Wenyu stared at the door, and after a while, a slender figure pushed the door in, and the chain was casually thrown on the ground by him.

After seeing the person clearly, Gu Wenyu breathed a sigh of relief, because the new person who appeared was Teacher Zhu.

Gu Wenyu followed him all the way, and now it seems that Mr. Zhu is very likely to be chasing the demonic qi, otherwise would he be watching the stars on the rooftop so night?

Of course, it is not excluded that Mr. Zhu is the mastermind behind the scenes. It's just that in comparison, Gu Wenyu is more willing to believe in the former, after all, Teacher Zhu still has a face exactly the same as Gu Wentian.

Even though Gu Wenyu knew very well in her heart that the person in front of her was not her brother, she still felt a little close. This is an instinct, which is not something that Gu Wenyu can control at all.

However, Mr. Zhu even had the key to the rooftop, and he was really well prepared, as if he had known that there was a problem with the rooftop.

Gu Wenyu's cat was in the corner, a small lump, and Teacher Zhu really didn't find her.

Mr. Zhu paced back and forth on the rooftop, his eyes always fixed on the ground, his brow furrowed, as if there was something on the ground that made him feel troubled.

Since Gu Wenyu had Xiao Hei's body, his night vision ability has also become excellent, even if there is no light on the rooftop, just by the dim moonlight, Gu Wenyu can clearly see everything in front of him.

Before Teacher Zhu went to the rooftop, she had already inspected the entire rooftop, and there was obviously nothing on the ground.

So what is Mr. Zhu looking at now?

Gu Wenyu waited for a while with a stomach full of questions, and Mr. Zhu finally stopped, he squatted down, looked at the cement floor in front of him fixedly, and then stretched out his hand to draw something on the ground, and the other hand was on his cheek, not knowing what he was thinking.

After a few more minutes, Teacher Zhu maintained this posture motionless, Gu Wenyu and the others were sleepy, she yawned big, and she really couldn't understand what Teacher Zhu was doing.

If it weren't for the faint demonic energy still mixed in the air, Gu Wenyu would have suspected that Teacher Zhu had something wrong with his brain. Even now, she is not enough to doubt Teacher Zhu's IQ, but her patience is about to run out.

It's like a person is intently watching the ants move, and then you're engrossed in looking at that person. You don't have anything else to do but look at that person. At least that person has ants to see, and you, you can't even see ants, you can't make sounds, you can't play with your phone, and you can't sleep.

This feeling, not to mention how aggrieved and boring it is.

Gu Wenyu couldn't help but yawn again, and just as she was about to squint for a while, she was startled by what she saw.

I saw that Mr. Zhu's eyes suddenly froze, and then he got up and took two steps back, spilling a handful of golden powder in his hand.

Gu Wenyu didn't see where he grabbed a handful of golden powder, but when the powder fell to the ground, a shining red pattern was clearly presented, and there was a faint golden light on top of this pattern.

When this pattern appeared, Gu Wenyu felt a mysterious power emanating from it, but it seemed to be suppressed by another force.

The rooftop, which originally had nothing, actually appeared out of thin air with such a mysterious pattern, and Gu Wenyu's eyes were straight.

At this time, Mr. Zhu didn't know where to take out a brush, the tip of the pen was dipped in golden powder, and it also exuded a little golden light, seeing this, Gu Wenyu could finally be sure that Mr. Zhu was by no means an ordinary person.

Looking at the red and gold intersecting pattern on the ground, it seems to be a formation.

But who drew this formation?

Is it a demon?

Or Mr. Zhu?