[Traditional realm of cultivating immortals + system + slow heat + single female protagonist + villain without losing his intelligence + strong sense of immersion + the more you watch, the more fun you get]
Li Changan is terminally ill and is bound to a "survival assistance system". He can become stronger as long as he does anything that is conducive to survival.
So he dug graves, robbed tombs to obtain treasures, refined corpses to serve as bodyguards, and practiced poisonous techniques for self-defense.
The system prompts: "In the world of immortality, living is justice."
But in the eyes of the righteous cultivators, he dug up ancestral graves, manipulated corpses, and was covered in poison. He was simply heinous, making him the number one evil cultivator on the list.
Li Changan wiped away tears while being hunted: "I just want to live longer. What's wrong with that?"