I Was a Villain in the End of the World, but I Saved Humanity

[The end of the world + book travel + system + black lotus heroine + plot reversal] "When everyone chooses to be kind, I am willing to bear the sin and let you live." Traveling through the apocalypse, tying up the system, and pushing the heroine into the zombie horde at the beginning. A vicious female supporting character? I bet. The plot must go? I leave. But no one told me—— Zombies will evolve, the human heart is more terrifying than corpse poison, and the system that forces me to do evil seems to be hiding the biggest secret of this apocalypse. I completed the "framing" mission with one hand and saved the entire team with the other. They hate me to the core and have to rely on me to survive. Until the male protagonist grabbed my neck and roared: "What kind of monster are you?" I looked at the awakening Corpse Emperor in the distance and wiped the blood from the corner of his mouth: "I'm here to save you-" "In a villain's way."