Other names:
He’s My Real Brother, Duke / Duke, That Man Is My Real Brother / He's Just My Brother, Your Grace! / 公爵别误会，他是我哥哥 / 公爵様、その人は私のお兄ちゃんです！ / 那个男人是我亲哥哥，公爵 / 그 남자는 제 친오빠인데요, 공작님
After losing her parents and ending up on the streets with her brother, Astel realizes she is actually in a novel where she and her loved ones die at the hands of a mysterious villain. Determined to change this, she decides to infiltrate the castle of Duke Anais and uncover the villain's identity! The first step of the plan succeeds, but now there's just one issue: she is bound to the shapeshifter duke as his mate! Will Astel be able to fulfill her goal while dealing with this new relationship?
