Qin Chuan and Xie Qiao grew up in the same compound. They have been bickering with each other for ages. Qin Chuan is simple and does not mince words but he always stands by Xie Qiao and will always be her most important friend. No matter where life leads them, they will come together.

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.