[Scheming female cultivator x cold, fierce High God + little romance, proceed with caution if that bothers you]
In her previous life, Ye Li, an ancient True God left behind from antiquity, sacrificed herself for all living beings. She had no idea that the Immortal Emperor had conspired to bring it about.
After her sacrifice, the gods vanished from the world, and the Three Realms fell into chaos. A fragment of her soul drifted through the world for a thousand years before finally attaching itself to a half-demon who had been tortured to death by the Immortals. When Meng Wan awoke, she had lost her memories of her previous life.
But she still remembered that she had to survive. And to live well, she would stop at nothing.
Female cultivator: How could a half-demon possibly win the love of High God Xuan Xiao?
Meng Wan: That's what happens when the Director is a hopeless romantic.
The Immortals: How can we allow a demoness to run amok across the Nine Provinces and Three Realms?
Meng Wan: Across the Nine Provinces and Three Realms, I'll kill anyone who displeases me.
Meng Wan regains her memories. It turns out that in her previous life, she died sacrificing herself for all living beings.
Meng Wan: Born a demon, I must pierce the heavens.
Xuan Xiao: Wanwan, whatever you do is right.
The Heavenly Emperor: So what if you're reborn? You'll still have to die again.
Meng Wan: No. This time, you're the one who will be sacrificed!
It's very interesting, with a small clue in each chapter and a big explosion at the end, always revealing the secret.