Lin Shuang (Rachel), a modern-day corporate drone, unexpectedly finds herself transported into the otome game Demon Butler—as Lilith Klein, the villainous duchess destined to be slain by four demon butlers. In the original storyline, Lilith was notorious for her brutality, tormenting the World Serpent Yegad, the Lop-Eared Rabbit Lyle, the Hellhound Kerberos, and the Bat-Succubus Mord until their hatred festered to the brink of maxed-out Dark Values. Now bound to a Fate-Changing System, Rachel must teeter on the edge of death with every move: rescuing the abused and mute Lyle, using her own blood to heal him in exchange for trust; braving the dungeon to strike a bargain with the yandere protagonist Yegad, narrowly reversing her deadly fate. With the wit of a modern office veteran, she shreds the white-lotus heroine and a biased mother, wielding psychological tactics with surgical precision. One by one, she tames the four obsessive demons—from vengeance-driven enemies into fiercely possessive loyal butlers. In a gothic world where humans and demons coexist, Rachel seizes power and scripts her own legendary rise.