I Became the Demon Lord's Cavity

Dan Ruo, an immortal stone spirit who could become an immortal without lifting a finger, woke up one day to find she had become a tooth belonging to the Demon Lord Jiu Fang Wujin!

To distance herself from the Demon Lord and become an immortal as soon as possible,

she hopped back and forth inside his mouth every day,

hoping he'd pull the tooth out soon.

Who could have guessed

that the Demon Lord would have such incredible patience?

Not only did he refuse to pull her out,

he took her with him as he wreaked havoc across the Three Realms.

Faced with relentless pursuit by gods, immortals, demons, and monsters,

Dan Ruo had no choice but to stay alive first,

starting a hellish life in which she and the Demon Lord would live and die together.

Dan Ruo: I'm exhausted. Great Demon Lord, you'll pay for not pulling out that tooth!

The gods and demons across the heavens were stunned.

The merciless Demon Lord had completely changed his ways:

he was vanquishing monsters, playing matchmaker, and even saving the world!

Jiu Fang Wujin: ...

And then, one day,

the cavity that made the Demon Lord's head throb whenever it moved

bloomed into a tree full of flowers in his heart.

A chess piece of the Immortal Realm x an orphan of the Demon Realm, a story of two people saving each other.

Note:

The female lead isn't really a cavity,

so readers with dental trauma don't need to worry!

Theme: The one I love is mine to protect.