Ghost King Divine Doctor: Your Highness, Your Princess Is Unstoppable

A special agent skilled in both medicine and poison transmigrates to another world, where the original owner was murdered by a wicked man and a malicious woman. Watch as she crashes their wedding, exposes their true colors, and gets her revenge. Back at the marquis's estate, her grandmother bullies her, her stepmother is cunning, and her sisters are hypocrites. She tears away their false masks and kicks the villains to the curb, turning life at the estate upside down. She treats her seriously ill, bedridden brother and, quite by accident, saves a prince feared by all. Before she knows it, she's aboard his ship, and life is a whole lot of fun from then on.