I Was Adopted by the Villain Grand Duke Who Killed My Favorite Character

My favorite character died, ruining the original story from the start At the age of six. My life was that of a bottom-rung s*ave, but it was okay because I was with my favorite character. I was worried that my favorite might have a hard time, but I believed things would get better. Soon, according to the original story, the ‘villain Grand Duke’ would come to save my favorite. However…… “You must become happy in my place.” My favorite character died. Because the Grand Duke, who should have come to save her, arrived late. The Grand Duke even mistook me for my dead favorite. I could not forgive the Grand Duke who ruined the original story and killed my favorite. Now all I wished for was a peaceful death. ……But what is this situation? “You’re not my Dad!” “I feed you, give you a place to sleep, and raise you. Then what am I?” “A fool.” The villain Grand Duke keeps trying to act as my guardian, even calling himself ‘Dad’. I’m not her, I tell you!