Ye Shujin, a medical girl, and Bai Huaiqing, a young man in trouble, met for the first time when they fell into a boat on a cold river. A mysterious jade pendant engraved with the word "Xuan" opened the door to a family injustice case. The two work together to investigate and discover that the case involves the royal secret treasury, Marquis Jing'an and the Jianghu organization "Netherworld Pavilion", behind which lies the truth about the death of the late emperor and the secret of the royal bloodline. From the smuggling of salt gangs in the south of the Yangtze River to the decisive battle in the Mobei wilderness, from palace intrigues to the rebellion of the vassal king, Ye Shujin used the art of treating poisons to maneuver, and Bai Huaiqing used his martial arts and wisdom to protect him. The two experienced life and death, and gradually uncovered the truth about the Bai family's conspiracy because they knew the secrets of the royal family's secrets - the masterminds behind the scenes were the Queen Mother and the second prince, and the late emperor also died of chronic poisoning with "Erotic Heart Powder". As the investigation deepens, Ye Shujin's life experience comes to light: she is actually a branch of the royal family, and the family's injustice is closely related to the struggle for imperial power. The two went from mutual support to secret love. In the process of quelling the rebellion and purging the court, Ye Huaiqing was canonized as "Dong An" and Ye Shujin was named "Mrs. Protector of the Country." In the end, they worked together to implement the "strategy to reduce the vassal status" and the "policy to improve people's livelihood", quell the chaos of the feudal lords, and eradicate floods in the south of the Yangtze River, but they chose to live in seclusion in the south of the Yangtze River. The old enemies were eliminated and the royal family was restored. The two went boating in the water town and sealed up the late emperor's edicts and secret strategies of governing the country in the ancient pagoda. Only the "protecting the people monument" was left to bear witness to the legend of half a life - from meeting in the cold river to the stability of the mountains and rivers, guarding the common people with swords, gallbladders and harps, and finally enjoying peace in the years.
