When a rare double-moon phenomenon sends modern medical student Shen Qingyue to the northern desert as a military doctor, she saves the badly wounded general Shi Yan and discovers that they both bear mysterious lunar marks. A bronze mirror predicts the Yongqing Dynasty will fall in three years. To unravel the prophecy, the two set out on a journey. From the northern frontier battlefield to the Shen family in Jiangnan, and from court intrigues to martial-world conflicts, medicine meets military strategy, while modern thinking blends with ancient wisdom. When the final prophecy points to a royal secret, they discover that the key to saving the world lies in the bond between them...