Han Ji-Min.
A boy who had given up on life awakens in the world of Eldros, a fantasy universe where summoned creatures are judged according to their worth. Labeled as "Defective," he is sent to the Hollow Pit—a haunted failed summon dungeon, where the sole law is survival.

The demons are gone, but their legacy lives on—in the unchecked greed of the nobility.. The Empire torments its citizens with atrocities in the shape of experiments, and the Hero is a callous pretender. Those who realize the truth start to fight against their tyrants.

And the Pit survivors?
They are compelled to become the servants of the Empire, transformed into tools of resistance against the very rebellion that struggles for justice.

Who then is the true enemy?
The Rebellion, or the Empire?