Grand Amour

Cecil, the son of the Marchioness of Hanover and her ex-husband, leads a double life. By day, he is a noble; by night, he becomes the phantom thief Rosenkreutz, a figure who disrupts the powerful Fahrenheit empire. His true identity is a closely guarded secret, tied to his position as a substitute for his poisoned half-sister of imperial blood.

To protect his family and fulfill a political duty, Cecil hides his gender and marries Oscar, the Chancellor of the neighboring country of Aquitaine. Initially, Cecil suspects Oscar of being the mastermind behind his half-sister's assassination. However, as they live together, Cecil finds himself gradually drawn to Oscar's genuine humanity, complicating his mission and his heart.