After Ten Millennia in Hell centers on Kang Oh-jin, a human who was unexpectedly cast into the most horrific reaches of the underworld. For ten thousand years, he endured relentless agony, eventually ascending through the hierarchy of demons by sheer willpower and brutal necessity. Having consumed the souls of the strongest demonic entities and mastered the forbidden arts of the abyss, Oh-jin finally discovers a rift that allows him to return to the human world. However, the Earth he returns to is no longer the peaceful home he remembers; it has been transformed by the "System," a global phenomenon that has turned humanity into players within a real-world dungeon crawl.

Now back in a world where rank and stats determine survival, Oh-jin must navigate a society governed by hunter guilds and supernatural threats. While his demonic powers are unmatched, he must carefully hide his true identity to avoid becoming a target for both human authorities and the celestial beings monitoring the System. The story explores his journey as he attempts to live a normal life while being fundamentally changed by his millenia-long exile, balancing his immense, dark potential with the fragile morality of the modern world.

What to Expect

Readers can expect a fast-paced narrative focused on strategic character progression and overwhelming combat spectacles. Unlike many regression series, the protagonist possesses a weary, veteran mindset from the start, leading to tactical solutions that utilize his deep understanding of demonic mechanics. The world-building blends modern urban fantasy with cosmic horror as the true origins of the System and Oh-jin's connection to the underworld begin to converge.

Who Will Enjoy This

This series is perfectly suited for fans of the "Overpowered MC" and "Urban Hunter" subgenres. If you enjoy the tactical power systems of Bleach (Color) or the intricate mystery-solving and high-stakes tension found in Detective Conan, you will find Oh-jin's double-life and the unfolding conspiracy behind the dungeons deeply engaging.