The SSS-Rank System: From Outcast To Overlord - Chapter 3: The Grand Reawakening.

The hero who was killed by the demon king ended up reincarnated as the son of the one who killed him! Thus began the life of the hero who donned in the mask of the ideal demon prince to topple his own kingdom while doing his best to prevent anyone from discovering his identity―― But to do that and blend into the demon tribe society, he had to kill his former comrades. Nevertheless, to become stronger, to save humanity, he had to walk through all kinds of paths of carnage! This is the tale of the demon race’s fake prince destroying his own kingdom.

O Hero, Trample Those Who You Should Protect!

TN: Most part of the other character in the novel is depicted from a non-human perspective so expect something that is completely different from the common sense of human.

What happens when a fanfic author with a habit of lying and scheming suddenly finds himself as a self insert during Duelist Kingdom? What happens when you have Yugi, Joey, Kaiba, and the rest encounter someone who knows all about every major player in their saga... and sees no problem with abusing said knowledge? Chaos, dear reader. Sweet, sweet chaos

Hyperthymesia. Those with this condition can remember every detail of their lives from something as significant as the world’s turning point to something as small and as insignificant as a minor fleeting thought. They cannot forget and their thirst for knowledge allows them to be considered genius in some senses.

Legend has it that Ji Yushi was this kind of genius.

In addition, it was said that he was gay and very beautiful.

As soon as the news that he was going to support Tianqiong’s seventh squad broke out, it sent everyone buzzing.

Everyone knew that the captain of the seventh squad, Song Qinglan, was a hoodlum and deeply homophobic.

He not only relied on his super-powerful abilities to become the dark horse on the battlefield in less than two years, but he also hates it when those at the top forces a flower vase* into his squad.

Sure enough, Song Qinglan announced in front of everyone, “Useful? Us brothers are going out there working ourselves to the bone, we don’t need a little genius who can only speedread quantum waves!”

Later.

The squad was forced into a dire situation during their mission.

That beautiful little genius calmly continued, every gunfire hitting the mark, his fighting power peaking.

Song Qinglan begged in front of everyone, “Adviser Ji, stay.”

In the end, he added, “I’ll work myself to the bone for you.”

*****

Ji Yushi had a secret.

He would often be awake at night, suffering from memory overload and recurring nightmares.

There was only one thing that could let him fall asleep peacefully.

And that was Song Qinglan.

*Flower vase: Someone who only looks pretty but can’t amount to much

In an inaccessible village, there were a few houses on the hillside.

People from far away were attracted here and the mountain road was crowded with luxury cars, because, in this town, there was a young man with incredible medical skills who could cure all kinds of illnesses!

- Description from Novelupdates