Julia Gray meticulously constructs a lethal plan to infiltrate the Smith family as the fiancée of their second heir. Pretending to be a blind, helpless girl, she uses her 'lethal gentleness' to manipulate Sean Smith, the eldest son and real power behind the Booming Group. Julia’s mission is simple: bring the Smith empire to total ruin to avenge her own family’s tragedy. But as she gets closer to Sean, she finds herself trapped in a web of deception where her targets and her heart start to blur. In a world of survival and betrayal, Julia must decide if she can finish her plan before her own mask of gentleness shatters.