Secret Lady

A child who has the ability to see ghosts, Yoon Seol-woo.
Has reincarnated into Rosantine, a princess who could see ghosts.

I've managed to fake not being able to see ghosts somehow but...

"Leave my sibling's body this instant!"

I cried out to the spirit who's possessed my one and only little (brother/sister)'s.
However, only the death penalty awaited for me if my ability were to be found out.
Then, there's only one way.

"You're planning to kill Prince Chartus, right?"
I will save the Empire's second prince, Prince Chartus with this ability!

"I'll bet my life on Your Highness."