Are You Saying I’m Going to Become the Favorite Daughter-In-Law?

I found myself reincarnated into a spin-off where my favorite character from the novel dies and her son becomes the male lead. Of all things, I’ve possessed the villainess who dies a wicked death by execution, the fiancée of the male lead, Lyla Brilston! The only fortunate thing is that it’s still the male lead’s childhood. “I refuse to die like this! First, I’ll crush my death flag and then try to save the life of my favorite character!” By using information from the book, I managed to assist the Northern Alliance and befriended the male lead, who was as icy as a spear. Unlike the original Lyla, I even gained special abilities and intended to peacefully indulge in fandom….. until sudden...