The Hero is Trying to Change the Heroine

I ended up possessing the body of an extra named Luberia, who is barely mentioned in the story. And right in the tragic novel “Emperor Caesar”, full of wars and disasters, where the protagonist sacrifices everything for the love of the hero and everyone ends up dying! I planned to live discreetly and hide my strength... But the male lead, Caesar, keeps looking for me and even proposes marriage, saying he wants to keep me around. Luberia doesn't want to meet the same tragic end as the protagonist, so she tries to avoid Caesar at all costs... But due to Caesar's intimidating appearance and assertiveness, before she knows it, she ends up engaged to him. Will Luberia manage not to fall in love with Caesar and survive until the end? (Source: KakaoPage, translated) *Note: Chapter count includes three side story chapters.*