Kangwoo once ruled Hell as its undisputed Demon King, holding dominion for ten thousand years amidst endless chaos and conflict. When he finally claws his way back to Earth, he expects things to be different but not like this. The world he returns to has become unrecognizable. Gates are tearing open across the planet, monsters are pouring through, and humanity treats survival as a brutal, gamified struggle for experience and levels. But Kangwoo is no longer at full strength; his long journey back has cost him nearly everything, and he has to start rebuilding from scratch. So he takes it one calculated step at a time, fighting, leveling, and adapting to this strange new Earth. In a world where falling behind means certain death, every move he makes is critical. The former Demon King is back, and he's about to remind everyone what ten millennia of experience really looks like.

Keywords: After Ten Millennia in Hell manhwa, Demon King returns, modern hunter fantasy, overpowered protagonist restarting, gate and monster apocalypse.

Meta Description: After Ten Millennia in Hell is a fantasy manhwa about a former Demon King who returns to Earth after 10,000 years to find it overrun by monsters and must rebuild his strength to survive.

Alternate Titles: After Ten Millennia in Hell / 지옥에서 만 년