I Slipped Into Becoming a Demon Emperor, and the Immortal Dao Empress Confessed to Me

[Book transmigration + overpowered + empress + single female lead + decisive killing + huge background + daily life + romance + later satisfying and sweet (this is not a completely mindless power fantasy; if you want a mindless one, please turn back now!)]

Su Baiye stayed up all night reading and accidentally transmigrated into a world where immortals and demons exist.

What a coincidence that he became Shen Yuan, the most miserable male supporting character in the whole book, a prince of the Demon Path.

Not only was his spiritual bone dug out by the Holy Maiden of the Immortal Path, Yan Liuli, but he was also tricked by the third-ranked saint son into handing over the demon pearl, becoming a criminal of the demon race, and was locked away in the Heavenly Demon Forbidden Zone.

Only then did the system descend. He lay low in the Heavenly Demon Forbidden Zone for a full ten thousand years, and finally became a Demon Emperor.

When he emerged, he happened to meet an immortal-path empress, Ling Yanhan...

From that moment on, the story became interesting.

In this life, this emperor will sweep across the ages!

Mo Tian: How dare you move against me? I am the supreme ruler of the demonic path!

Su Baiye: Hmph. Supreme ruler of the demonic path? You are not worthy!

Yan Liuli: Shen Yuan, I love you!

Su Baiye: Oh really? Then dig out your spiritual bone and give it to me!

Yan Liuli: Aren't you afraid I'll kill Ling Yanhan!

Su Baiye: If you dare kill her, I will exterminate your entire clan and make your soul a prostitute for eternity...

...

(The synopsis is weak; please read the main text!)