Despite her youthful appearance, a princess reveals that she has lived through ten lives, each marked by tragedy. Misunderstood and cut short in her previous existences, she finally uncovers her true lineage as the offspring of a war hero named Paeon. However, her newfound father's past actions of forsaking her drive her to seek strength and vengeance within the confines of the royal palace. Determined to rise above her circumstances, she plans to exploit and then discard her neglectful father. As she strives to become formidable and break free from her oppressive environment, she encounters Leo, the son of the demon king. Unlike his haughty father, Leo is a captive soul whom she nurtures in secret. Their relationship takes a surprising turn when Leo declares his intent to be her eternal protector, a claim that leaves the princess bewildered. Amidst the tangled web of a forbidden romance between her father and a holy knight, and the budding affection with an enemy prince, the princess is faced with the challenge of altering her predestined tragedy. Can she rewrite her fate with these unexpected allies by her side?