Yuyi Yue is a performer who operates within a multiversal framework where she enters fictional worlds to portray the tragic beloved known as the white moonlight. Her objective is to capture the emotional journey of winning over a male lead before ultimately dying to maximize audience engagement and mission points. In one such world, she encounters Fang Xun'gui, a top assassin known as Zhan Kong from the Blood-Severing Pavilion. Fang Xun'gui is a cold, isolated figure raised by killers, carrying deep emotional scars and a blood oath that binds him to the Pavilion Master until age twenty-five. He is haunted by the death of his elder brother, Fang Yunmo, nine years prior, and harbors a deep-seated self-loathing that prevents him from seeking happiness or connection.
The story begins when Yuyi Yue finds Fang Xun'gui severely wounded after he eliminates the last member of the Netherworld Hall, an enemy organization. Instead of fleeing or attacking, she tends to his injuries with professional detachment, charging him for her services despite his initial hostility. Her pure, unworldly demeanor, shaped by her upbringing in the secluded Misty River, confuses and unsettles Fang Xun'gui. She remains unfazed by his threats, revealing that she has implanted a Life-Death Gu in him to ensure he pays his debt. As Fang Xun'gui recovers, the barrier between them begins to crack. He is drawn to her innocence and the genuine care she shows him, experiences entirely foreign to his brutal existence. Yuyi Yue, in turn, recognizes the vulnerability beneath his cold exterior and deliberately cultivates his affection, viewing his emotional transformation as part of her performance.
A significant turning point occurs when Fang Xun'gui returns to the Blood-Severing Pavilion and reveals his connection to the organization to Yuyi Yue. He learns that the Netherworld Hall, the same group he recently destroyed, has discovered Yuyi Yue's presence. They mistakenly believe she is a hidden asset or loved one of the Pavilion Master, Xue Ningshuo, and attempt to kidnap her to use as leverage against him. This revelation forces Fang Xun'gui to confront the danger his world poses to Yuyi Yue. He struggles with his desire to protect her and his belief that he is unworthy of her love, leading to a period of intense internal conflict. He attempts to push her away, burning the clothes she mended and the prescription she gave him, trying to sever the emotional tie before it leads to her destruction.
However, the conflict escalates when Yuyi Yue is targeted by assassins sent by the Netherworld Hall. Fang Xun'gui rushes to her aid, discovering her injured but alive. The incident solidifies his resolve to protect her, despite the risks. He realizes that his feelings for her are genuine and that he cannot abandon her to the dangers of his violent world. The narrative explores the tension between Yuyi Yue's ultimate goal of dying to complete her mission and Fang Xun'gui's desperate attempt to keep her alive. As their bond deepens, Fang Xun'gui begins to heal from his past traumas, finding a sense of purpose and warmth he never thought possible. The story sets the stage for a climax where Fang Xun'gui must choose between his duty to the Pavilion and his love for Yuyi Yue, while Yuyi Yue faces the inevitable conclusion of her role as the white moonlight who must depart.
