Harry Potter: A Certain Ancient Rune Professor of Hogwarts (TL)

Felix watched the young witch leave as he stood at the window, he could vaguely see through the darkness in the distance, a pair of young wizards sitting holding hands and enjoying a leisurely weekend.

"The Age of Peace ..." he chewed on the word with slight emotion, it wasn't until he returned to Hogwarts that he realized the effects of war as an afterthought.

When the Dark Lord had wreaked havoc, Felix had been leading the older kids in the Muggle orphanage to beat up the punks from the school next door, and it was safe to say he had a happy time. And by the time he enrolled in school, the Dark Lord had been gone for almost a year.

It turned out to be a very messy time in the wizarding world - Death Eaters busy trying to escape their sins, ambitious people eager to seize the power vacuum, victims constantly demanding for compensation, and fugitives who were not happy with their defeat hiding in the gutter and plotting a comeback. None of this affected him, of course; it was the young wizards at Hogwarts who affected him.

The pure-blooded families of the wizarding world at the time did everything they could to distance themselves from the Dark Lord, and did they discriminate against wizarding muggle family?, Absolutely not, But how they behaved at home, and how they educated the next generation, might have been a different story.

It's during the time that he enrolled in Hogwarts and-

Shh! Keep quiet, look what we found, a muggle-born Slytherin! Let's bully him!

Well, that was the mental activity of most of the Slytherin students at the time.

When the dinner was over and Felix was about to make friends with his roommates, a Slytherin said to him with a disgusted look on his face, "Go away, you vile mudblood!"

Felix didn't understand the meaning of the word until he subconsciously shot the other person with a Petrificus Totalus, I mean, whoops.

Both sides were a bit confused at the time.

Luckily, there was only one head of steel, the other two roommates had frighteningly low knucklehead values and if you ask one question they answered ten, so by the time he lay in bed that night he already had some idea of what his future held.

He realized that this clash today would not be the end of events, but the very start of everything.

What followed was as he had expected, but fortunately, in just one week he had fought to convince, yuck! He forced himself to make friends with the new students, who have said more than once in public that Félix is a good guy, not only talented but also helpful.

He couldn't beat the upper classmen for the time being, but with the professors and school rules in place, they wouldn't cast a vicious spell on him. After all, a fight in the same year could be described as a frictional clash, but an attack by a senior against a junior would result in expulsion.

And by the time he had shown his great magical talent, there weren't many who still wanted to get involved with him.

Needless to say, there was no shortage of smart people in Slytherin.

But the danger didn't only exist at school, Felix couldn't remember how many death threats he had received during his school years, but he clearly remembered the first one was at his first year's Christmas party.

It was an anonymous yelling letter, and he guessed it was probably sent by the parent of one of the new students he had beaten up at the time.

Still, he had cautiously stayed in school that year, by bonking a second-year Slytherin, so he was detained- and he couldn't be blamed for that, they had made the first move, and he had just made the best out of it.

But he didn't expect the death threats to intensify, and at the beginning of his second year, a batch of red Howler flew at him, filling the great hall with "Get out of Slytherin, you filthy mudblood!" Or "Don't let me see you, or I'll wipe out Slytherin's shame with my own hands!"

The young wizards at dinner were stunned, and Headmaster Dumbledore was particularly serious as he examined the remains of the Howler himself. But it was difficult to trace the source of such things; the owl was rent and the sound was disguised.

Frankly, he was in a difficult position. He wanted to study magic in peace, but things never worked out the way he expected.

Felix had to continue his plan of making friends, making more friends and fewer enemies. To do this, he had to suffer some misunderstandings - people who didn't know the truth interpreted it as him striking out in retaliation.

It wasn't long before he approached a third-year Slytherin, who had developed a particular dislike for him and sent him to the school clinic for three weeks under the guise of "seeking guidance".

He actively visited this friend afterward and was distraught at his "mistake", which was, after all, an accident!

Professor, I'm really distressed, you want to deduct my points and detain me during this holiday? Go ahead and deduct them, I can bear it ...

Felix suddenly realized that if you want to get into trouble with Slytherin, it's really easy, all you have to do is call their family rubbish in a place where no one is around.

This fishing tactic was tried and proven.

After a few times, the third year Slytherin succumbed - the most headstrong he encountered was still that roommate, but even headstrong as he was, he happily accepted his friendship after seven days of lying on the floor.

In his third year, he put down the last stubborn seventh year Slytherin, and when it was done, there was a real sense of enjoyment in beating the odds and passing out with a full grade.

But he was still afraid to step out of school; he still had to deal with the annual death threats.

That's why he spent the whole year desperately trying to gain two level 6 spells when his magic theory was only level 4!

But it was worth it, as he was able to use his level six "Full Body-Bind Curse" and "Shield Charm" to take out the seven idiots who tried to attack him over the holiday in the fourth year, and who are still living in Azkaban!

The next time he initiated a family duel at the beginning of the fifth year, it was no big deal to him, and none of the official duels took place - that Shafiq was simply picked up the next day.

After that, he lived happily ever after until graduation.

After graduation, Felix didn't choose the Ministry of Magic or the wizengamot as destinations, he wasn't interested in working there.

Good prospects? Good pay?

Well, he could finally justify it by saying, I'm not interested in the money.

He then wanted to stay in school, but unfortunately, Headmaster Dumbledore turned him down.

"You're young, travel more and see more, or work in peace for at least two years."

Felix ended up picking the travel the world option, experiencing the wizarding customs of different countries like clockwork, especially the black markets of different countries, where there was no shortage of old magic manuscripts and alchemical artefacts, which he desperately needed.

He also met some interesting (dark) wizards as a result, and everyone covered their faces so that they didn't judge a book by its cover, but rather each took what they wanted.

When he meets some particular dark wizards, he happily tests his magic ideas on them, and it must be emphasized here that he hasn't ended any lives personally, but has created a bunch of idiots - hopefully, some of his friends and their family will take them back for treatment.

His "thinking room" is also taking shape a little at that time.

After his travels, Felix applied again for a teaching position at Hogwarts and was politely refused in return. However, it seemed that he was not interested in the Ministry of Magic and Dumbledore suggested that he should live in the Muggle world for a while.

Felix chose to accept. On the one hand, he thought it might be a "test" from Dumbledore, as he was not really a "professorial candidate" after all the things he had done at school, and on the other hand, he wanted to pave a way for himself as a scholar --This way, even if the professorial path did not work out, he could still communicate with other famous wizards.

He was very confident about this. On muggle studies, there was one thing he could do in a heartbeat.

He could write ten books on muggle research a year if he wasn't afraid of shocking the jaws of the wizarding world. But in the end, he decided to be patient and make more sense of what he was doing.

In the span of two years, his correspondence with Dumbledore had increased dramatically in frequency, with Felix constantly sending him a number of research manuscripts and the two exchanging correspondence on Muggle issues.

This gave him hope that he would return to Hogwarts.

Although midway through his third job attempt, he failed again ... as he looks back on the journey, he still feels miserable. But from the correspondence, he realized that Dumbledore's attitude had quietly changed.

The next step is to publish a book and release it. His books received a lukewarm response in the market, but were extremely informative in the eyes of professionals.

The name Felix Hap was also given the title of "expert on Muggle research".

Thanks to this, in the third year of his career, he was able to establish pen-pal relationships with many famous wizards, which benefited him greatly.

He was also asked by the ministries of magic in some small countries to be head of their department that dealt with muggle issues, but he declined.

Exactly three years after graduating, he finally received an offer of an interview at Hogwarts.

It all begins here ...

Felix stood at the window, watching the sun go down, a glimmer of afterglow clinging to the horizon.