I've already become a Hogwarts professor, and the system only just appeared.

At that moment, Professor McGonagall approached from a distance. She was startled to see Malfoy. She first put Malfoy down, then looked at Su Yu seriously and asked:

“Professor Su, you must explain what’s going on here? At Hogwarts, professors are absolutely not allowed to use such evil curses against students.”

Su Yu remained calm and recounted the events of the previous day to Professor McGonagall. After listening, Professor McGonagall glanced at Malfoy and said:

“Professor Su, although Malfoy’s actions were indeed somewhat outrageous, at Hogwarts, it is advisable for professors to avoid using curses against students.”

Upon hearing this, Malfoy looked at Professor McGonagall in surprise. The slug in his mouth prevented him from speaking, but his eyes were full of questioning: Professor, you just said that it was absolutely forbidden!

"Yes, Professor McGonagall, I'll be more careful next time." Although he said that, Su Yu was thinking, "I'm not going to listen to Hogwarts' advice."

“Alright, Professor Su, please help Mr. Malfoy break the spell as soon as possible. I have some other matters to attend to and need to take Potter away for a while,” Professor McGonagall nodded.

"Okay!" Seeing Professor McGonagall leave with Harry Potter, Su Yu knew that Harry was going to be allowed to join the Quidditch team as an exception.

After glancing at Malfoy, who was vomiting slugs incessantly, Su Yu didn't want to touch him, so he had Crabbe and Goyle take him away to Mrs. Pomfrey's school hospital.

Before leaving, the young master glared at Su Yu, his eyes clearly saying, "I'll tell my dad!"

Su Yu paid no attention and let the remaining children continue practicing using the flying broomsticks. He waited until Mrs. Hodge returned before preparing to leave.

At this moment, Mrs. Hodge suddenly pulled him aside and said somewhat embarrassedly, "Professor Su, I heard that the principal and the others recently obtained a new communication tool, something called a magic phone."

Su Yu immediately understood and said, "I'm sorry, Mrs. Hodge, the technology for magic phones is not yet mature enough, so they can only be manufactured by hand. I didn't make many before, so..."

Mrs. Hodge said, "It's alright, it's alright. Professor Su, when will you make a new one? Could you please save one for me? How much would it cost? I can pay a deposit first."

Su Yu waved his hand. After all, Madam Hodge had only provided him with a specific skill point. A magic phone was really nothing.

"No need, Mrs. Hodge. Actually, I'm currently researching the technology for mass-producing magic phones. I believe it won't be long before it's on the market, and I'll send you one then."

After saying goodbye to Mrs. Hodge, Su Yu returned to the library and began studying his Transfiguration technique until it was time for his afternoon class.

“I have never seen a professor as studious as you. You seem more like a student!” Mrs. Pince joked.

"Are you complimenting me on how young I am?" Su Yu replied with a smile.

"Haha, of course, you look like you just graduated not long ago. Who would have thought you're already over thirty? If I were 30 years younger, I might consider pursuing you," Mrs. Pince laughed.

"Thank you for the compliment!"

Su Yu left the library and went to his classroom. Now, Muggle Research has become the most anticipated course for students in their third year and above. Everyone is dreaming of winning that cool magic revolver from Su Yu after the semester ends.

After class, Su Yu planned to go straight back to his office. He now had more projects on his hands: perfecting the mass production process of the magic phone, the dud version of the magic pistol, and the concept of a magic network server based on moonstone.

Each one was a tough nut to crack, but before he could even leave the classroom, Hermione rushed in, looking anxious, and said, "Professor Su, could you please do me a favor?"

"Tell me what it is." Su Yu was very patient with this cute little girl.

“Malfoy and Harry are dueling in the Trophy Room tonight at midnight, and I hope you can stop them,” Hermione said.

So that's what it was about. Su Yu retrieved the relevant information from his old memories. That meant that Harry, Harry, and the others would probably go to the fourth floor tonight to the room guarded by Fulwei the Cerberus.

Su Yu not only couldn't stop this, but he also had to go along, so that the main quest would definitely be able to advance a lot further.

So he comforted Hermione, saying, "Don't worry, Hermione. Malfoy definitely won't dare go to the display room at night. I bet he's just trying to trick Harry and the others so that Filch will deduct points from Gryffindor."

Hermione suddenly realized: "That's right, Professor Sue, that must be it. I have to go back and tell Harry not to go out tonight."

After saying that, Hermione ran off like a gust of wind, full of energy. But given the Potter family's temperament, how could they possibly listen to Hermione's advice?

Su Yu returned to his office, set an alarm for himself, and immersed himself in his research. At 11 p.m., the alarm rang. Su Yu picked up Coal Ball, cast a Disillusionment Charm on himself, and arrived at the door of Gryffindor's common room.

Before long, the trio emerged from the lounge, Hermione still trying to persuade them:

“Harry, Ron, are you out of your minds? Professor Su Yu has already said that Malfoy is afraid to go to the trophy room. He's just lying to you. Maybe he's already reported you to Filch.”

"Get out of here!" Ron said impatiently.

Hermione ignored Ron and grabbed Harry instead: "Don't you care about Gryffindor? Don't you care about yourself? I don't want Slytherin to win the House Cup again, and I don't want you to lose all the points I got from Professor McGonagall using a transfiguration spell."

Harry wavered, but Ron pulled him back: "Alright, Harry, don't listen to her. Do you want Malfoy to announce to the whole world tomorrow that you're a coward?"

Ron's words immediately strengthened Harry's resolve. He quickly left with Ron. Hermione felt helpless. She was about to go back to sleep, but when she turned around, she found that the Fat Lady was no longer in the picture frame. She couldn't go back!

Left with no other choice, Hermione quickly caught up with Ron and Harry: "I'll go with you."

“You’re not allowed to go!” Ron refused.

“What am I supposed to do? The Fat Lady isn’t home, I can’t go back. Am I supposed to just wait here for Filch to come and get me?” Hermione complained, feeling that it was all Harry and Ron’s fault.

Before the three had gone far, they ran into another person at the corner of the corridor—Navi Longbottom, the man who had broken his hand that morning.

When Neville returned from Madam Pomfrey's, the lounge door was already closed, and poor Neville had forgotten the door opener's password, so he had to wait there alone.

“The password is ‘Pig Nose,’ Neville. You wait here for a bit. You can go in after the Fat Lady comes back. We have other things to do,” Harry said to Neville.

"Don't leave me behind, please! The ghost of Blood Man Barrow has passed by here three times already, I'm terrified!" Neville cried as he quickly followed.

The trio became a group of four, and they tiptoed to the prize display room on the third floor. Su Yu followed behind them, recording their cautious behavior, which he could later share with Chen Ying and Tang Kesi as a funny anecdote.

As midnight approached, Malfoy did not appear. Ron said, "He's late. I think he must be scared. Tomorrow we can announce to everyone that Malfoy is just a coward!"

Hermione retorted irritably, "You really are... Can't you see that this is a trap set by Malfoy for you? He never intended to come."

Just as the group was arguing, a voice came from outside the door: "Smell around, darling, they might be hiding somewhere. Find them quickly, I'm going to lock them all up."

Filch seemed to be in a good mood, his words carrying a hint of mockery. He held the wand that Su Yu had given him, a glow emanating from its tip.

The four young wizards were terrified. In the darkness, they held onto each other's clothes and moved forward little by little, trying to leave without anyone noticing.

However, the environment in the trophy room was too complicated. Neville accidentally tripped over the leg of a piece of medieval armor, fell forward, and fell down with Ron, knocking the armor to the ground.

The armor fell to the ground and scattered, making a sound that seemed capable of waking all the students at Hogwarts. Filch immediately spotted them and shouted, "Little mice, I've found you!"

"Run!" Harry shouted, and was the first to dash off.

They ran for a long time, and just when they thought they were about to shake off Filch, they encountered Peeves, the most mischievous ghost in the castle!

Peeves saw them and immediately shouted excitedly, "Little wizards, don't sleep! Little wizards, don't sleep! Hahahaha... You're going to be expelled!"

Harry and his friends were furious, but they were helpless against Peeves. In the end, they rushed to the fourth floor, the corridor that the headmaster had said at the opening ceremony was off-limits to all students.

Harry and his friends hid behind a door, and the noise outside gradually subsided. Peeves and Filch were gone.

Just as the group breathed a sigh of relief, they were shocked to find that standing opposite them was a gigantic, three-headed hellhound.

The three-headed dog's six eyes, each as big as an adult's fist, were staring intently at the four people. Its teeth were yellow, and thick saliva dripped continuously from its three large mouths.

“What…what is this?” Neville’s teeth were chattering.

"I don't know, but... we'd better leave now!" So the four of them reopened the door and ran away even faster than when they came.

Su Yu was standing at that doorway, but instead of chasing after the group of four, he looked towards the other side of the corridor, into the darkness.

It wasn't that he didn't want to chase, but he sensed a powerful aura that had locked onto him, and he felt that his best option was to stand still.

A moment later, a figure emerged from the darkness. It was Dumbledore. He looked at Su Yu and asked as if it were a chance encounter between friends, "Professor Su, what brings you here so late?"

Seeing that it was Dumbledore, Su Yu breathed a sigh of relief. He had been genuinely afraid it would be Voldemort. So he put on a smiling face and said:

"It was Professor Dumbledore. This afternoon, Hermione Granger told me that Draco Malfoy had arranged a midnight duel with Harry Potter in the Trophy Room."

"To make sure they didn't cause any trouble, I decided to come and check. I never expected there to be a three-headed dog here. Those four children must be terrified."

After Su Yu finished speaking, Dumbledore did not respond, but stared straight at him with starlight in his eyes, as if he could see through everything.

The burning sensation on his neck told Su Yu that the old man in front of him was using Legilimency on him. Coalball also sensed the threat, poked his head out of Su Yu's arms, and let out a roar at Dumbledore.

Dumbledore seemed to snap out of his daze, glanced at the soot sprite, and said with a smile, "Cat-leopard, what a wondrous creature."

Su Yu smiled in response: "Yes, they are born with the ability to use Legilimency, and they are also very sensitive to it."

"It's getting late, Sue, go back and rest!" Dumbledore clearly had no interest in continuing the conversation.

Su Yu wanted to say something more, but after hesitating for a moment, he finally just said, "Okay, Professor, good night!"

"Phew!" Su Yu finally breathed a long sigh of relief after walking quite a distance. Dumbledore's oppressive aura was simply too strong. The old man's magical power level was definitely above LV10, or even higher.

As expected, his trip aroused Dumbledore's suspicion. Fortunately, he was prepared and wore the Legilimency Pendant and the Coal Ball, otherwise many secrets might have been exposed.

However, there is a good side to the story: the main quests "The Principal's Secret" and "The Boy Who Lived 2" have both progressed significantly ahead.

To avoid any unnecessary trouble, it's best to behave yourself for the next few weeks and not provoke Dumbledore's sensitive nerves.

In the following days, Su Yu returned to the monotonous life of the library, meals, classes, and office. His only entertainment was chatting and sending photos with Chen Ying and Tang Kesi.

Until Friday night, Su Yu had Jingjing notify Filch to come to his office at 6:30 pm, because the first version of the magic pistol customized for the Squib was completed.

He tried it a few times and felt it worked very well, but whether it really works for duds, only Filch himself would know.

Chapter 27 Minor Success in Transfiguration

At 6:30 p.m. sharp, Filch knocked on Su Yu’s door. He was dressed impeccably as always and was extremely humble toward Su Yu.

In fact, Filch had already arrived at Su Yu's office door at six o'clock. He was so eager to get his hands on the magic pistol that he dared not disrespect Su Yu in the slightest, so he could only pace back and forth outside the door.

“Professor Su, this is the Galleon we agreed on before, that…” Filch’s words were cut short, because Su Yu had already taken out the magic pistol and handed it to him.

Filch stared blankly at the revolver.

This specially made revolver is different from ordinary revolvers. It has only three magazines, but the grip is larger than that of ordinary revolvers and is covered with intricate patterns, making it very attractive.

Of course, Filch had never seen an ordinary handgun before and couldn't tell the difference. Seeing him in a daze, Su Yu simply shoved the revolver into his hand, took the money bag from his hand, threw it on the desk, and said:

"Give it a try. I've made some adjustments to this pistol. Once fully charged with magic, it can unleash 12 spells."

"However, I've reduced the types of spells to only three practical combat spells: Disarming Spell, Binding Spell, and Petrifying Spell. The way to use them is similar to that wand."

"Okay... okay, thank you, Professor Su!" Filch immediately channeled his magic into the magic pistol.

Filch noticed that there was a graduated groove on the grip of the magic pistol with 12 marks, and the first mark was filled in about twenty minutes.

Su Yu pointed to a mannequin in the room and said, "Alright, let's test its power directly. You can explore the rest on your own when you get back."

Filch nodded, and under Su Yu's guidance, rotated the magazine to the binding spell, then raised the gun with both hands and pulled the trigger somewhat shakily.

Without a sound or recoil, a red beam of light shot from the muzzle of the gun, directly at the dummy. In mid-air, the red beam of light suddenly transformed into a rope, binding the dummy tightly.

Su Yu tugged at the rope, and the force was roughly equivalent to the power released by a level 2 magic user, which was a significant improvement from an alchemical perspective.

"Alright, it looks pretty good. Go back and figure it out yourself. I have some things to take care of!" Su Yu gestured for him to leave.

Filch bowed to Su Yu again, took out a beautiful handkerchief, wrapped the pistol in it, and then left.

Su Yu wasn't deliberately trying to drive Filch away; he genuinely had something to do. By the time he arrived at Hagrid's hut, it was almost eight o'clock. Su Yu asked, "How is it, Hagrid? Any news from the centaurs?"