The Castle: Keeper of the Sacred Eye

In modern-day Korea, the Imperial Family holds a secret duty of exorcizing "Imae," creatures that lurk within paintings to feed on the grief of humans. But such beings can only be detected by people like Jo Yuyeon who possess the Sacred Eye. Despite knowing that Crown Prince Geon needs her special vision, Yuyeon gets caught up in a deceptive marriage plan to make it seem like another woman has her ability instead. But no secret can be kept forever. What will become of Yuyeon once it's revealed that she is the keeper Geon has always been looking for?

(Source: Tappytoon)