Lin Xiao finds himself trapped as the villainous Eldest Senior Brother of the Azure Mist Sect after transmigrating into a harem novel. To secure immortality, he must faithfully execute his role as antagonist—taunting Fourth Junior Sister, stealing Third Junior Sister's garments, and poisoning Second Junior Sister's meals. When Ye Chen, the destined protagonist, finally arrives at the sect, Lin Xiao anticipates the script's inevitable outcome: his failed assassination attempt, exposure by his junior sisters, and humiliation at Ye Chen's hands. What unfolds instead shatters every expectation. "Big Brother's poison is child's play," Second Junior Sister purrs. "Allow me to demonstrate true toxicology." "Eliminate Ye Chen! Seize Eldest Senior Brother! He belongs to me!" Third Junior Sister demands. "Slaughter them all! Build a realm where only Eldest Senior Brother exists!" Fourth Junior Sister shrieks. His master gazes adoringly. "My precious disciple is adorable, even attempting covert poisoning." Lin Xiao's internal screams echo louder: "Follow the plot! I'm the one meant to die!"