The story tells the story of Su Wanqing, a civilian medical girl who, in order to save her seriously ill younger brother, was forced to replace Bai Yueguang, the daughter of the Governor's Mansion, and became the "contract wife" of the powerful, cold-blooded and violent Marshal Fu Yunzheng. At first, Fu Yunzheng only regarded her as a recreational toy and the shadow of his former lover, which was extremely humiliating. However, Su Wanqing relied on his extraordinary medical skills, perseverance and extraordinary wisdom to repeatedly save the day in the crisis-ridden Marshal's Mansion and the turbulent current situation. Not only did she cure the commander's long-lasting chronic illness, but she also showed amazing courage in the face of plagues in the army, enemy assassinations, and commercial battles. Step by step, she transformed from a humble stand-in to become Fu Yunzheng's indispensable help in his career and the only light in his heart. When Bai Yueguang returned and attempted to take back everything, Fu Yunzheng, who had already been deeply in love with her, domineeringly protected his wife and teamed up with Su Wanqing to expose the conspiracy. They faced the warlords' melee and the crisis of their family and country together, and finally created a legendary pure love in the war era. The highlight is the heroine's powerful counterattack from "passive substitute" to "active control", and the extreme contrast of the male protagonist from "cold-blooded handsome" to "loyal dog and jealous king".
