In the midst of the apocalypse, standing before the final boss, Baek Ha-yoon was betrayed by the friend he trusted most. Gritting his teeth, he cursed the heavens, but death claimed him all the same.

However, when he opened his eyes, he was back in the past—just before the end of days. What’s more, though he was completely powerless before his regression, he has now unlocked a Hidden Class.

From now on, those who betrayed him, those who refused to cooperate, and those who only looked out for themselves—he’s going to smash all their heads in and become the strongest on Earth.