He's My Real Brother, Duke

Synopsis

I possessed the hero's younger sister 'Astell' in a fantasy novel! Her family is destroyed, and she eventually suffers a tragic death, including herself and her brother... ! But I know what the novel is about! If so, wouldn't it be possible to draw a new destiny with my own hands? Although the true identity of the ultimate mastermind was not revealed even until the end, the spies of the mastermind went into the Duke of Anais' land! There must be a clue there! No matter what happens, I'll break in there and change the ending for my brother and me! Step 1, become the lifesaver of Duke Anais and invade the Duke's Castle! → Step 2 of success, enter the peasant castle and become the duke's companion engraving?! → Unpredictable situation! Step 2.1, you have to touch the peacock for an anxious engraving?! → Unpredictable Situation222 → Excitement?! I have to dig up information from the Duke's Castle and find the mastermind, but how can I be so excited about Duke Anais, who might be the final mastermind himself?! Even the Duke misunderstood my brother as my lover (?)?! A misunderstood and lovely revenge drama to find Astell's final end begins!! (Source: KakaoPage, translated)