The Grim Reaper Young Lady Wants To Save Her Mastermind Older Brother

"I must make my brother happy." Titus, the Duke of Bernstein, became the mastermind behind the rebellion against the royal family in order to protect his sister, Maydis, from becoming the "Royal Sacrifice". However, he was ultimately cornered and killed alongside his sister. At that exact moment, Maydis returned from death to two years before Titus became a rebel. In order to avoid her brother's death and find out the secret behind the "royal sacrifice", she tries to approach Prince Diel, her brother's best friend... as his fiancé?!