Huang Bixing

As the underworld ferryman who has broke up their love, Man Shu meets Sha Hua, who can give them warmth, one day. The two are destined to have to go through various obstructions by the Mengpo. As the two undergo various tests and eventually survived the eternal night, to save the underworld, Shahua became a ferryman, guarding Manshu.

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.