Lin Xingyao was an orphan who lost her parents in an accident when she was ten years old. Her uncle Lin Youqiang and aunt Zhang Xuemei took custody of her but stole her parents' inheritance. Six months later, Lin Xingyao went missing and was adopted by an elderly couple in the countryside. Ten years passed, during which the uncle and aunt built a wealthy business empire in Rongcheng. When Lin Xingyao returned to report her disappearance, the police located her relatives. The Lin family saw her not as family but as a burden and a tool. They had already arranged a marriage contract between their biological daughter Lin Xingwei and Jun Xuanye, the heir of the prestigious Jun Family. However, Jun Xuanye had become mentally unstable three years prior, and Lin Xingwei refused the match. The uncle and aunt decided to force Lin Xingyao to take her cousin's place, viewing her as a disposable scapegoat to save their own daughter from marrying a madman.
Lin Xingyao was not the simple country girl they imagined. In reality, she was a highly trained operative with extensive combat and medical skills. She had returned to the country on a mission to investigate the Jun Family, whose patriarch Jun Xuanye had inexplicably gone mad. Using the marriage contract as her entry point, she agreed to the substitution but demanded two million as a dowry, effectively reclaiming her parents' stolen inheritance in the process. She married Jun Xuanye and entered the Jun Family estate, where she was initially looked down upon by the stepmother Zhao Meijuan and the servants.
Upon meeting Jun Xuanye, Lin Xingyao discovered he was not merely insane but was being systematically poisoned with a hallucinogenic herb called Mixincao, which was being administered through his medicine by Doctor Zhang, who was loyal to Zhao Meijuan. The poisoning had been ongoing for years, keeping Jun Xuanye in a state of madness and physical deterioration. Lin Xingyao secretly stopped the poison, administered antidotes, and removed a silver needle that was being used to suppress his consciousness. She also freed him from the iron shackles that had confined him for three years.
As Jun Xuanye began to recover, tensions rose within the Jun Family. Zhao Meijuan, fearing the loss of her control, attempted to have Lin Xingyao and Jun Xuanye trapped in an elevator to trigger another psychotic episode. Lin Xingyao handled the situation herself, repairing the elevator and exposing the sabotage. When Zhao Meijuan and Jun Zheyuan, the patriarch, tried to blame Lin Xingyao and demand a divorce, Jun Xuanye, now fully conscious and restored to his former authority, intervened. He publicly declared his loyalty to Lin Xingyao, fired Zhao Meijuan's loyal staff, and asserted his dominance over the family.
The story continues with Lin Xingyao and Jun Xuanye navigating the complex internal politics of the Jun Family. While their relationship begins as a partnership of convenience, with Jun Xuanye revealing he still loves another woman who saved his life years ago, mutual respect and trust gradually develop. Lin Xingyao continues her investigation into the conspiracy behind Jun Xuanye's poisoning, uncovering deeper layers of betrayal within the family. The narrative follows their efforts to dismantle Zhao Meijuan's influence, reclaim Jun Xuanye's rightful position, and uncover the truth behind the attempts on his life, all while managing the intricate dynamics of their arranged marriage.
