Counterattack System appeared when I'm already At The Mahayana Realm - Chapter 533 - 534:

It was a dangerous era. Extraterritorial ferocious beasts occupied 90% of the living space in the world, while humans could only survive in a small space. Fortunately, some of the surviving humans awakened to genetic martial arts! Breaking the shackles of one’s genetics was the foundation of cultivating martial arts. Lin Feng, who was born with congenital disease, could not experience a breakthrough. However, by some fateful encounter, he awakened to the ability to merge genes.

He remembers nothing. But the world remembers him.In a land ruled by dying kings and false gods, a nameless high elf awakens — alone, hunted, and forgotten by history.He does not seek war.But war finds him.As monsters kneel, vampires swear loyalty, and ancient warriors rise from exile, the world begins to change. Whispers of prophecy stir. The gods grow silent.And above it all... the sky watches.Strategic. Dark. Mythic.This is not a tale of chosen heroes.This is the rise of something older.A 1,000+ chapter epic of forgotten divinity, shattered kingdoms, and the birth of a new world.Why Read?Slow-burn, high-stakes progression.Rich worldbuilding & political warfare.Followers you’ll fear and love.For fans of Overlord, Re:Zero, and Attack on Titan.

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.

The first phase of the tiran impact lasted for a whole day. Asteroids falling into earth, releasing and spreading strange green gases into the air. This has mutated or should I say, Zombified humans who were infected, Mutated monsters, and alerted alien races about the existence of earth.Those who survived for 24 hours recieved a chance to survive what was to come as that wasn't the end.Dexter was always a person who didn't care about the world. However, becoming a vampire in the apocalypse was something that he never anticipated. But it was a must if he wanted to leave his hiding spot which was surrounded by monster zombies.While restraining himself from giving into his urges to drink blood, he struggles to keep his sanity intact.Time and time again he refuses to become a lawless bloodsucker.Well, he would rise, facing different adversaries and foes, developing from the once weak and feeble human, into a vampire god....Make sure to check out this fl book 'Disguised as a boy to attend Belmont High School'.