Counterattack System appeared when I'm already At The Mahayana Realm - Chapter 722 - 721: The Emperor’s Power, Unbound by Laws

Resident Evil, natural disasters… Zombies, the ice age…

Through movies and video games, humans have been familiarized to these kinds of, “doomsdays.”

But nobody actually believes that any of those things would happen.

Though from childhood Su Lifeng was a person that could foresee disasters, he never thought that one day he would be foreseeing the end of the world:

In 100 days, the entire world would fall.

Humans would be near the point of extinction.

Su Lifeng took a large, deep breath upon awakening from this vision: “I need to bust a load to calm down…”

- Description from Novelupdates

The one single goal in life of the Strongest Old Sage is to subjugate the Demon King. In an epic final battle, both of them met their mutual destruction at each other’s hands.

However, the Demon King was not completely destroyed!

In order to destroy the Demon King once and for all; post-death, the Old Sage trains in the World of Gods and reincarnates as the Apostle of the Gods, Will.

In the reincarnated future, the Old Sage had become a legend and his former disciples hold the supreme authority in the world. The disciples had created an organization to oppose the Demon King and an academy to nurture the new generation of Heroes.

Thus the Apostle of the Gods, Will (8 year old), enrols into that Academy of Heroes.

This is the story of a boy on a mission to save the world through epic battles while enjoying Academy life.

“Martial Arts World...” Death murmured, shocked by the turn of the events. How could he, primordial being of the afterlife, get tricked by a mere human? Not just a mere human, but also earthling, race that was weakest of the twenty realms. Death realized the extent of his mistake. An earthling had just jumped into the river of the reincarnation, where he definitely didn’t belong. It was too late. The damage has been done. The matter was now out of his hands. “Kiernan Hunter...” ... Remake of the Martial Arts System, and while the concept stays the same, the story is completely different. A few names, etc, stays the same, but mostly whole new story.