Pei Zhao, the young minister of Dali Temple, investigates the violent death of the richest man Shen Wanjin. He meets the mysterious woman Su Zhi and discovers that the case is connected to the massacre of the imperial doctor twenty years ago. While pursuing clues, the two encounter a mysterious organization called the "Moon Shadow Alliance" who pursue them, uncovering the shocking conspiracy of Right Prime Minister Yan Song to collaborate with the enemy and treason. When a poisoning incident broke out at the Ancestral Temple sacrifice ceremony, Su Zhi was poisoned to save Pei Zhao. The appearance of half of the "Blood Moon Order" even revealed the secret of the eldest princess. In the crisis of the Oara army pressing down on the country, Pei Zhao must decipher the secret language of "The Moon Shines on the Golden Saddle" and find the last hope to save the dynasty in the maze of identities and lies.
