After Death, He Returns to the Underworld and Becomes the Master of the Underworld.

System Male protagonist + female protagonist There are two forces in the underworld One side is the emperor One side is the devil Chasi The male protagonist was seriously ill and could not be treated, so he finally returned to the underworld. However, the male protagonist was unwilling to reincarnate his fate again, so he planned to challenge the entire underworld to become the ultimate master of the underworld. Even if he was in the eighteenth level of hell, he would still be inferior.