Reborn as a (Fake) Demon Realm Darling

Jiang Nianyan transmigrated into a book, becoming the Demon Realm's only little demon lord. But having read the whole story, she knew the truth:

She was a fake!

The real one was Xie Wanyan, the personal guard who was tormented and ordered around every day by the heroine, then eventually turned evil and destroyed the world!

Faced with the whole Demon Realm doting on her, Jiang Nianyan said, "Sorry, I can't accept this."

Your Demon Realm is always in trouble, so I'll use spoilers to help you out.

Grand Imperial Uncle, you'll face a bloody disaster if you go out today. Second Imperial Uncle, you'll suffer a great calamity tomorrow.

Chief Priest, the fortune you read two days ago was wrong. Great Demon General, there's a traitor in your army...

At last, she went from being adored for her identity to being adored for her strength. Turning around, she saw the real demon heir.

Waaah, you all dote on me, and I'll dote on you! Please don't turn evil and kill me!

What she didn't know was that this demon heir had also been bound to spoiler comments...

As the personal guard of the beloved little Demon Princess, Xie Wanyan one day saw strange words appear before his eyes.

[Poor thing, is this the swapped-at-birth tragic villain who's both beautiful and powerful?]

[The little darling bullies you like this, so why don't you fight back?]

[Villain, can you see the comments? Your darling Demon Princess is a fake! You're the real one! The little Demon Princess will hit you for the first time when she's one, and stab you for the first time when she's two, and ... she'll have the whole Demon Realm bully you for her. Good luck with that!]

Xie Wanyan, constantly harassed by the comments: ...

What?

She's a fake?

I'm the real one?

And she'll abuse me until I turn evil???

Evilness level rises early: +1+1+1+1+...!

I'll grab my blade and deal with her first!

But then...

Jiang Nianyan, who had just been making a scene in front of everyone, saw him, blushed, and rushed over. "Brother Wanyan, Nian Nian missed you so much today~"

[She's acting!]

[Don't believe her!]

[Don't let your guard down!]

Xie Wanyan, held in a tight embrace: ...

Fine. It wouldn't hurt to wait a little longer.

[Childhood friends, they grow up as the story progresses]

[Devoted demon heir who fails to turn evil and is gentle only with her x lively, sweet, doted-on (fake) Demon Princess]

Theme: Keep striving to turn things around, no matter how hard it gets