Cut off my way home? You'll sacrifice the entire other world in return!

Li Fan transmigrated to another world for ten years, becoming a fearsome demon king. But instead of killing, he cultivated a sustainable system of resentment, believing that enough resentment would allow him to return home. He had loving parents, air conditioning, Wi-Fi, and a simple yet happy life waiting for him. However, his final battle with the hero shattered everything. The hero triumphantly told him that the Justice League had gone to Earth and severed his time-space tunnel home, throwing him a missing person poster from his parents as a mockery. Looking at his aging parents in the photo, Li Fan's resolve snapped. Since gentle methods wouldn't work, he would resort to the most violent means. The system restrictions were lifted, activating the world sacrifice mode. By slaughtering all living beings in this world, he could force open the gate to the next. Thus, the true demon king descended. When the entire world fell silent, Li Fan, covered in blood, pushed open the portal. "If this world isn't the end, then I will slaughter my way through all the realms until I return home."