The apocalypse arrives, and the passage to the underworld opens. In just six months, South Korea and Mexico, where the passages are located, have been largely overrun.
Yu Mo is bullied by his own family. His younger sister is raped and driven insane, but the police do nothing when he reports it. He appeals to higher authorities, only to be toyed with by corrupt officials and sent to prison for three years.
Then the apocalypse descends upon the human world. In this life, Yu Mo will not only save the world, but also kill everyone who has ever wronged him. He will wipe them all out, leaving not a single one alive!