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.

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Xue Yao is a cold-hearted and loyal general investigating the mystery of his brother’s death. He becomes entangled with an unfavorable princess named Chu Yue, who suffers from insomnia due to a childhood accident and spends her time reading romance novels to rid herself of boredom.

After losing her family, Shen Qingtang is taken in by the powerful Pei family and raised as the heir Pei Congzhi’s adopted sister. Enduring years of mistreatment and emotional manipulation, she decides to escape the oppressive household and the dangerous bond with Pei Congzhi, determined to take control of her own fate.