The sole survivor of a bloodshed, Gu Qingzhi awakens under a new identity — Shen Xihe, the Princess of the Northwest. Once a proud and spirited rose of the frontier, she has now transformed into a cold, calculating figure, determined to seize control of her destiny and dominate the game of power. Crown Prince Xiao Huayong, frail in body but razor-sharp in mind, sees through the treacherous currents of the court. As their fates intertwine, they grow closer, joining forces to command the winds of destiny.

The series tells the story of Yun Wei Shan, a spy longing for freedom, who infiltrates the palace to complete a mission. Within the eerie and mysterious palace, she encounters love and friendship, embarks on a journey of self-discovery.

Based on true events set during WWII in Northeast China, an ordinary man is thrust into a turbulent fate against the backdrop of the inhumane bacterial experiments conducted by the Japanese Imperial Army's notorious Unit 731.