He's Just My Brother, Your Grace!

Following the tragic loss of their parents and a desperate struggle to survive on the streets, Astel experiences a sudden awakening: she has been reincarnated into the world of a novel where both she and her beloved brother are fated to die at the hands of an elusive villain. Determined to rewrite their tragic destiny, she embarks on a dangerous mission to infiltrate the formidable castle of Duke Anais to uncover the true identity of the mastermind behind their impending doom. While the initial phase of her infiltration plan goes smoothly, Astel suddenly finds herself entangled in an unforeseen complication. To her utter shock, she discovers that she is now bound to the enigmatic shapeshifting duke as his fated mate. As she navigates the perilous waters of political intrigue and personal survival, Astel must figure out how to maintain her undercover mission and prevent her family's demise while simultaneously managing this unexpected and intense new romantic bond with the powerful duke.