Su Wanli, a modern military doctor with supernatural abilities, is betrayed by a spy within her unit during a top-secret rescue mission. After dying in an explosion, her soul returns to the body that had been occupied by a wandering spirit from another world for three years.
Now the legitimate daughter of the Marquis of Anning, she is dressed in mourning white and married into the General's Estate of Zhenguo to bring good luck to Xiao Juechen, the fourth young master, who is paralyzed from the waist down and on the brink of death. The entire estate is draped in white on her wedding day, and everyone looks down on her. As soon as she wakes, she learns that the original owner was secretly pushed into a pond and drowned. She is trapped in a desperate situation, bullied and schemed against, and even threatened with being forced to follow her husband in death.
With the supernatural ability that returned with her soul and her top-notch military medical skills, Su Wanli first saves Xiao Juechen from the brink of death, shocking everyone in the general's household. She then takes on the wicked servants, reclaims the dowry that was embezzled, and brings order to the household, gradually taking control of its affairs. While carefully tending to the male lead's health, helping him recover from the poison and regain his strength in battle, she also takes down her stepmother and stepsister from the marquis's household, settling the scores for three years of injustice and schemes. At the same time, she secretly investigates the truth behind the male lead's severe injuries and disability on the frontier, exposing the mastermind behind the collusion between the court and foreign enemies.
From a profligate good-for-nothing bride brought in to bring luck, mocked by the whole capital, she rises to become a powerful and wealthy noblewoman, cherished by her mother-in-law, adored by the general, and doted on by her son. In the end, the couple join forces to pacify the frontier and cleanse the court, winning a happy family life and a lifetime of honor and favor.