Toaru Majutsu no Index SS: Kanzaki - Chapter 8: The One who Teaches the Secret Rune. VALKYRIE.

His will is tough and he is unwilling to be normal. However, his pathway was destined to be that way, being born in a small sect’s branch.

However, one day, his left eye merges with the eye of an Ancient God in an accident. From that moment on, he turns from a fish into a dragon.

He rises up like a star, walking the path of a legendary cultivator.

From being a tiny, small ant at the bottom of the world, he rises step by step, into a place full of powerful sects, strong ancient clans and countless geniuses.

This is an era of legends.

- Description from novelupdates

He lived from BC to the Middle Ages, from the Renaissance to the Industrial Revolution, and from Cyberpunk to the Interstellar Age. He has been a king and a prophet, a knight and a nobleman, a versatile artist, a genius inventor…
This is a four-thousand-year human epic——
“To us four thousand years from now:
“Is the world at peace? Is famine extinct? Can people touch the stars? How long is the human lifespan? How far is the boundary of the earth? Human…do you remember us?”
——Excavated from Earth Age Tenth Century BC, Solomon Prayer Book.

- Description from novelbuddy

A hero must be compassionate, selfless and courageous.But that isn't all. Because a hero must also be powerful.In this world, power is everything. Strength decides who gets to save lives and who's left with community service. That’s why I was nothing — a rank 50 E-Class reject, skating through the streets, saving what little I could while the real heroes battled gods and monsters.Then one day, I died. Almost.Dragged into the abyss, I was given a second chance: the Forever Core. An armor that evolves. A system that never stops adapting. Every battle, every hit, every mistake, I come back stronger.Now, the monsters that once crushed me can’t kill me the same way twice.I must adapt. Evolve. I must grow stronger and fight harder. Because humanity is worth fighting for.Even if I have to burn every villain alive to prove it.

I found myself inside the bleak BL novel Silence, where both the protagonist and the antagonist perish. And I became the oppressed omega, Seo Heemin, who tries to escape, ends up breaking his ankle, and even suffers a miscarriage. As expected, as soon as I come to my senses, I am sold to Cha Yiheon, who harbors a deep grudge against the original protagonist. “Why don’t you hit me?” “…Do you want to be hit?” Fortunately, he is a revenge-driven character who loves Seo Heemin dearly. To return to reality, I have to gently seduce him and achieve a happy ending. *** “Hyung, it’s Heemin.” —…Where are you now? Are you crazy enough to want to die? The raw emotion of his anger was palpable. His rage was at its peak, more intense than ever. But, as I had expected this reaction, I calmly responded to him. “I’ll be done with my appointment in an hour, so come pick me up. Let’s go on a date at our lake park.”