The story begins during the annual Spirit Festival in the Kingdom of Risel, a celebration honoring the founding queen and the spirits who blessed her. While a grand party takes place within the castle, Crown Prince Zachary of Risel meets with Iris Icefield, the current "Wise Princess" and daughter of a Duke. Zachary, a nineteen-year-old with youthful emerald eyes, informs Iris that he is breaking off their engagement. To his surprise, Iris joyfully accepts, her usually stoic demeanor replaced by a radiant smile, a rare sight that captivates him. He questions her lack of regret, but Iris points out his own affections for Helena, his mistress, which he admits to. Iris, as a Wise Princess, is destined to aid the future king with her knowledge and magical prowess, and she was well aware of Zachary's affair.
Following the annulment, Iris encounters a young man with golden hair and sharp blue eyes who reveals himself to be Prince Albin of the neighboring Kingdom of Lemuria. Iris inexplicably calls him "brother," triggering fragmented memories of a past life as Princess Fiona of Lemuria, who was betrayed and killed by her cousin, Albin. Iris realizes she has reincarnated. Albin, intrigued by her familiarity, questions her. Iris, regaining her composure, attributes her recognition to his striking appearance and subtly probes him about his sister, Princess Fiona, confirming her past life and the impending betrayal. Driven by a desire to prevent Fiona's tragic fate and the looming political instability between their nations, Iris decides she must go to Lemuria. She manipulates Albin into taking her with him by feigning a desire to be his "sister" and then, during a dance, proposes to be hired by him, specifically as Fiona's tutor. Albin, impressed by her skill and audacity, agrees to recommend her as Fiona's education supervisor, allowing Iris to travel to Lemuria.
Upon returning to her family estate, Iris is questioned by her father, Duke Icefield, about the rumors of her "dumping" Zachary. The Duke reveals that Zachary has been spreading the story that he broke off the engagement, not the other way around, to mitigate the political fallout of a prince discarding a Wise Princess. Iris, now free from her engagement, uses this situation to her advantage, securing her father's reluctant approval to travel to Lemuria.
The journey to Lemuria is arduous, but Iris, now possessing the memories of both Iris and Fiona, endures it with surprising resilience. During a stop near the border, Iris, sensing an impending goblin attack, uses her knowledge of past events to prepare. She demonstrates remarkable combat prowess, deflecting an arrow aimed at Clarissa, Albin's maid, and later holding her own against a goblin, even as Albin intervenes to finish it. Clarissa, impressed and somewhat infatuated with Iris, expresses her gratitude and admiration.
Upon arriving in Lemuria, Iris's true identity as the Wise Princess is kept secret, and she is introduced as a noblewoman of unknown lineage. She is assigned Clarissa as her maid, but Iris, recognizing Rebecca, a former acquaintance from her past life, considers making her her personal attendant. Soon after, Iris meets Princess Fiona, who is much younger than Iris remembers from her past life. Fiona, a budding swordswoman, challenges Iris to a duel to test her strength, seeking a tutor who can truly push her. Iris, using her knowledge of Fiona's past and her own latent sword skills, engages Fiona in a fierce but ultimately friendly battle. Iris, despite being outmatched in raw physical power, uses her tactical brilliance and the unexpected activation of her spirit's blessing to defeat Fiona, earning her respect and acceptance as her tutor. Albin, observing the interaction, is intrigued by Iris's enigmatic nature and her potential to change Fiona's destiny. Clarissa, meanwhile, develops a deep admiration for Iris, and Albin suspects she may have fallen for her. The narrative concludes with Iris having secured her position as Fiona's tutor, setting the stage for her future endeavors in Lemuria.
