Legend of Dawn: the Dark Prince, General and Concubine

A hard-working white-collar worker was assassinated to find out the cause of his father's death. By chance, I traveled to the troubled times in the book - the female devil who kills people without blinking an eye. There are powerful enemy generals outside who want to kill her. There is a spy inside who wants to take her life. There are even more ferocious man-eating beasts watching the border. How bad is the character of this physical body? Even the shady husband of the official spouse was cold to her, cruel to her, and plotted against her! In this troubled world full of crises, Let's see how the useless little otaku who has no power to tie up a chicken fights back and is reborn. Survive in this cannibalistic space? This story contains elements of war, suspense, sadomasochism, high IQ, survival crisis, etc.