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.

After being betrayed and killed by her best friend and powerful elites, Jiang Leyao is reborn with memories of her tragic past. Determined to take revenge, she discovers her friend has also been reborn and taken her place in a wealthy marriage. As Jiang Leyao begins her counterattack, she realizes her enemy is backed by an even greater force, complicating her path to justice.

Childhood sweethearts Shi Yi and Xia He are back in 2008 for each other. While enjoying the relationship, Shi Yi's future husband who abuses her, and Xia He's future wife who cheated on him, are also back in the past, and the four of them are fighting for love and hatred in the destiny.