Read manhwa  Secret Lady / The Lady’s Secret / 시크릿레이디
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.”