This drama follows Fan Changyu, a butcher’s daughter, and Xie Zheng, a fallen noble seeking revenge. Their fake marriage turns into true love, but war tears them apart. Determined, Fan Changyu wields her butcher’s knife on the battlefield, searching for justice and her husband. Meanwhile, Xie Zheng reclaims his title, fighting to protect his country and love. Reunited in battle, they stand together, defying fate, uncovering the truth, and returning home without forgetting their vows.

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.

Zhang Yi'ang, a veteran detective, is sent to Sanjiangkou to investigate a case but soon finds himself caught in a web of crime and corruption. While pursuing a powerful criminal network, he unexpectedly receives help from a group of bungling thieves, who inadvertently aid his mission to unravel the truth behind a murder.