Felix politely said goodbye and left.

In the afternoon class, he was rarely distracted.

"Please turn to page 147. Let's take a look at how ancient wizards viewed the concept of 'existence'."

"Professor? We talked about this part in the last class..." A little wizard raised his hand and said.

Felix showed a surprised expression. He looked at the textbook, "It is indeed my problem. I must apologize to you. This also shows a problem. Professors are also human. They will definitely make mistakes..."

"Okay, let's turn to page 152. Today we will talk about ancient magic runes related to 'hope'."

The Weasley twins in the audience looked at each other, and Fred squinted his eyes: 'Professor Hepp actually made a mistake in class. It's rare.'

George mouthed: 'We witnessed history.'

Fred pinched George's thigh to prevent himself from making any sound.

After class, the twins surrounded Felix.

After answering a few questions, Fred asked curiously, "Professor, is there anything we can help with?"

"What?"

"Oh, professor," George said with a smile, "We think you may have a little trouble. Although it can definitely be solved, maybe we can do something."

Felix smiled, "Mr. Weasley, I don't have anything... um," he looked at the two of them and asked thoughtfully, "Can you get a magic camera?"

He knew that the little wizards had a small circle similar to a flea market in private, which contained all kinds of novel and interesting gadgets.

"Professor, can a Muggle camera and developing potion be used? The effect is the same." Fred said.

"Yes," George explained, "The first-year Creevey bought the developing potion from us, but he brought his own camera."

Felix thought for a moment and said, "Okay."

Within two days, he received the camera, film and developing potion.

He paid the balance readily.

In the following week, when Felix and Helena chatted, they deliberately did not mention the conflict that night.

Felix introduced interesting things about the outside world, even including the secrets of his travels during that year——

"Were you really caught by the Aurors in the American magic black market?" she asked in surprise.

"I can't say that. It was just a coincidence that I caught up with their actions. I originally wanted to slip away with the crowd——everyone was covering their faces anyway, so I could just Apparate after going out."

"Then what?" she asked with interest.

"Seven Aurors identified me and stared at me and chased me..." Felix said with regret: "I had to knock them down."

That was the first actual combat of his instant kill tactics, but in order to increase the speed of thinking, he took a bottle of magic potion, which gave him a headache for a week.

"What a pity..."

"What a pity?" Felix asked.

"It's a pity that I can't use magic, and I even lost most of the memories related to casting magic." She said regretfully: "Ghosts are not complete. I only have a particularly deep memory of my death..."

"What about other memories?"

"Either vague or no resonance, just like watching a stranger's experience..." She said.

At this moment, he finally made up his mind.

Felix said, "Helena, there is something I need to tell you."

"What is it?"

Felix hesitated, and he took out his camera, "Can I take a picture of you?"

Helena looked at him in surprise. She hesitated for a moment and agreed happily.

Felix took a few photos of Helena alone, and finally took a photo of the two of them together.

"It may take a day or two for the developer to work."

He looked at the smile on Helena's face, and his heart was surging. Helena saw the expression on his face and slowly calmed down, "You don't want to talk about this, right? This makes you embarrassed, Felix?"

"Do you know the Room of Requirement?"

"Uh, oh..." She stroked her hair in a panic, "I know, it's a laboratory built by my mother. I often went there when I was a child, but my mother didn't want to be disturbed, but I always went against her." "

Have you been there again? I mean..." He paused, "After becoming a ghost."

"No, no." She said dryly.

Felix understood. Perhaps out of guilt or self-punishment, she deliberately avoided this place.

He whispered, "I found something left by Ms. Ravenclaw in there. It might be about you."

"What—what did you say!" She flew over quickly, staring at him intently, as if trying to tell if it was a bad joke.

Felix looked into her eyes calmly, without any intention of joking.

Helena believed it.

She asked anxiously, "What is it? What did she leave behind?" Her translucent pearly white body floated in the air. Her hands tried to grab Felix's shoulders, but they passed through.

A bone-chilling coldness made Felix shiver.

"It's a memory." He whispered.

...

In the next few days, Helena kept avoiding him.

Felix understood her very well. This feeling of worrying about gains and losses was not pleasant. Who could guarantee that Ms. Ravenclaw's memory must be left to Helena?

Can the memory be awakened by a ghost?

After awakening, will you remain rational?

If you are rational, can you get the desired result?

Although the answers to these questions are most likely "yes", no one can be sure except at the moment when the truth is revealed.

During this period, Felix obtained seven photos. Under the effect of the developing potion and the adjustment of his magic, Helena looked like a real person, with beautiful appearance, tall figure, and a smile on her lips.

Finally, on a weekend morning, she found Felix.

"Take me there," she said calmly.

"Have you decided?"

She nodded solemnly. She would accept whatever the outcome was.

Felix and Helena stood quietly in front of the Room of Requirement on the eighth floor.

A blue door slowly appeared. Helena looked at him. Felix grasped the handle and pushed the door open.

Felix stepped into the room again, with Helena beside him - or rather, he was the guest.

As Helena entered the Room of Requirement, the whole room became active.

Tiny sounds came from all around them. Even without changing his perspective, Felix could feel a huge magical power awakening.

The furnishings in the room kept disappearing, and the space kept extending until it became a white, boundless world.

The sky and the earth seemed to have lost their boundaries, leaving only Felix and Helena.

Not far in front of Helena, the magic power surged and gathered, outlining the figure of a lady.

From illusion to reality, she walked out of nothingness.

After a thousand years, Rowena Ravenclaw opened her eyes.