She saw the books on the desk in front of her rapidly turn yellow, then grow moldy, then rot... finally becoming a pile of pitch-black decayed matter.

"Ugh, it stinks. Lily Turner, why is there a pile of poop on your desk?" Michael Bolton said, pinching his nose.

"Impossible, how could a ghost domain appear at this time?"

But a male classmate nearby turned pale, suddenly stood up, and quickly backed away several steps.

"Jason Carter, what are you screaming about?"

Mr. Miller was very angry. What was going on with the usually well-behaved students during tonight's evening self-study?

On the podium, Eric Clark's eyes narrowed, his whole body filled with alertness. The previous look of exhaustion vanished, and he suddenly seemed like a wild beast released from its cage, becoming somewhat violent and fierce. He stared at Jason Carter.

But Jason Carter showed an unnatural calmness.

"Looks like you know quite a bit. Are you a ghost handler too?" Eric Clark said.

"Eric Clark, this is my business, you don't need to interfere."

Then Jason Carter glared fiercely at Brian Cooper: "It's all because of you, everything was brought by you. I really should have killed you earlier, otherwise things wouldn't have turned out like this. And the future you is too terrifying."

Brian Cooper looked at Jason Carter in confusion, not understanding what he meant, but what concerned him more was the old man in black standing outside the classroom door.

The other students were shocked by these words.

"Damn, Jason Carter, what you just said almost scared me to death."

"What ghost handler, what future, you guys are talking way over my head. I don't understand at all. Can someone explain it to me?"

"Jason Carter seems to know the inside story. Big shot, please look after me. I vaguely feel something's wrong around here. Am I the only one who feels this way?"

"We're doomed, doomed. What's going on today? Is it that I can't keep up with the times, or is the world changing too fast? By the way, why did my books also turn into a pile of crap?"

The students talking seemed not to realize that danger had already arrived, and were just curious, even a little excited and thrilled by the strange events.

Suddenly.

"Knock, knock knock."

A dull, clear knocking sound, as if striking directly on everyone's heart, suddenly rang out, carrying an almost eerie tone as it echoed into the classroom.

At that moment, everyone felt as if their soul was being gripped by something, a suffocating pressure like being held underwater and unable to breathe.

"It's that knocking sound... exactly the same." Brian Cooper shuddered inside.

It was exactly the same as the sound from that audio file on the forum, only hearing it in person was even clearer.

Eric Clark's expression became especially grave. He picked up a special phone and urgently pressed a button. The call was immediately connected.

"Eric Clark? Report the situation."

A woman's voice came from the other end.

"A supernatural event has occurred here," Eric Clark said immediately.

"Already recorded."

The voice on the other end spoke quickly: "Can you handle it?"

Eric Clark said, "The ghost has already formed a ghost domain and started affecting my location. You can't see the lights from outside anymore. I estimate the ghost domain is larger than I thought."

"A ghost domain... the situation has escalated. It's beyond your ability to handle. Please evacuate immediately."

"If you use the ghost's power again in your current state, it's very dangerous. There might not be just one ghost where you are, but two. I suggest you retreat. Even though you're close to your limit, even if you risk your life, you might not be able to save a single person." The voice on the other end responded immediately.

Eric Clark said, "There's no time. I'm less than five meters from that thing, right outside the classroom door. It might have already set its sights on me. I'll keep the line open. If the call drops, it means I'm dead. Please deliver my will to my parents. That's it, I'm going to take action now."

"Knock. Knock knock."

The dull, oppressive knocking continued outside, one long, two short, at a fixed rhythm, knocking on the classroom door again and again.

"Mr. Miller, someone is knocking on the door," an uninformed student shouted.

Mr. Miller hesitated, but seeing Eric Clark's expression, it seemed something very serious was happening. Still, unable to suppress his curiosity, he opened the back door of the classroom and went out to see who was knocking.

"Don't go out!" Eric Clark shouted urgently.

But he was too late. Mr. Miller had already gone out. Strangely, as soon as Mr. Miller stepped out, it was as if he vanished in the blink of an eye.

Yes, he was gone.

Outside the classroom was pitch black, the thick darkness seemed able to swallow any trace of light. Once Mr. Miller went out, there was no more movement, not even a sound, as if he had simply disappeared into thin air.

And as the classroom door opened, the darkness outside seeped in like a thick black fog, continuously eroding the space inside the classroom.

Chapter 4: Knocking

Knock, knock knock.

The dull, eerie knocking continued at a fixed rhythm, like an alarm clock set to ring.