What Kind of Devil? She Is Obviously My Innocent Little Junior Sister

[No system + anti-routine + decisive killing + fast pace + single female protagonist + relaxed and funny + cool] Deng Jie finally attained enlightenment and became an immortal, but he encountered the destruction of the three realms. What he couldn't believe was that the ruthless female devil who destroyed the Three Realms was actually the junior sister who didn't even dare to kill a chicken! What happened to her during these three thousand years? She went from being gentle and kind to being completely unconscionable. Is it a lack of humanity or a loss of morality? Deng Jie was arranged to go back in time to stop her. But teaching her not to be evil doesn't seem to solve the problem. Is it possible that I have been bullied and I have to swallow my anger? After being cheated, you still need to be merciful? Do you have to accept being accused of unwarranted charges? That's not called kindness, that's called cowardice! Living in such a useless way, it is better to let go of one's hands and feet, fight a bloody road, and ask the people of the world: "What kind of female devil is she? She is obviously my innocent little junior sister!"