He was suddenly summoned to another world one day.
Monsters poured out, a huge disaster incoming.
His ability the lowest.

[Player's level is low]
[Your level is hopeless]

It doesn't matter whether you're the chosen warrior, a talented wizard,
or someone who travelled back in time.
One must do everything they can,

in order to survive.

The Regressor's Instruction Manual.

"It doesn't matter if I'm trash." Is there anyone who wouldn't do anything they could to survive?

The Yakmun clan which boasted a long and ancient past was wiped out in a massacre. The corpses piled up like mountains, and the blood flood like ocean water. Amidst this hell of despair, Sura, opened his eyes. - No one shall be spared. I shall kill everyone. It doesn't end unless I've killed each and every one of them. Jin Ja-Kang is the lone survivor of the Yangmun Baekhwacheol-geok clan. On a day, far in the future, the story of revenge against the Gangheo Murimsa, which shall be recorded in legends, begins!

Novel Adaptation.