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.

College crush Xiguang Nie enters family firm, meets ex-doctor Yusen Lin initially clashes but eventually falls for her. He returns to medicine, she becomes a capable manager with her mother's help. Her past crush Xu Zhuang also moves on.

Mei Zhuyu, a calm and reserved nobleman from a lesser branch of the Mei family, arrives in Chang'an as an official at the Bureau of Mystic Investigations. During a banquet, he meets Wu Zhen, the bold and unruly younger sister of the Empress and secret Guardian of the Demon Underworld. Both hide their true identities. Wu, a half-demon striving to keep peace, and Mei, a skilled demon slayer, seek the truth behind the fire 18 years ago. As bone demons rise and unrest grows, they fight side by side, forming a bond that deepens into love until the Changxi Palace launches a purge, forcing them to face each other's secrets and the past they share.