On a midwinter night, a water transport case occurred. Shen Yuan, a young minister of the Ministry of Justice, was ordered by his father to go south to investigate the case, and unexpectedly uncovered the shocking conspiracy behind the disappearance of military supplies and the Turkic invaders. The clues point to uncle Cao De and Taifu Yang Wenyuan, but they don't know that they have been involved in a huge whirlpool targeting the Shen family and his son.
Prime Minister Shen Mo, who carries the secret edict of the late emperor and is in charge of the secret force "Xuan Ying" who has been loyal to the royal family for generations, walks on thin ice in the court. He used his son's hand to stir up the deadlock, triggering a bloody battle between Cao De's relatives' group and the forces in Prince Jing's border town. The young emperor Li Cheng secretly planned to use the opportunity to weaken the powerful ministers, but he was wary of the "Xuanying" controlled by the Shen family.
Shen Yuan was shocked step by step during the investigation, and found that the clues of the Arsenal, Turkic Jade Pendant, and Yumen Pass were intertwined. When the three-legged confrontation was first established, although the Shen family held a high position, they were caught between the emperor's intentions and the conflicts between powerful ministers. Loyalty and survival have become the ultimate tests that Shen Mo and his son must face. And the real "Zhulong" is still staring in the dark at this chess game related to the fate of the country...
