On a bloody night in late autumn, the entire Huan Prince Mansion was massacred by the Big Dipper array. Eight-year-old Liu Dan hid in a gap in the closet and witnessed his father, Prince Huan, being injured by a moon-patterned poisonous needle. The word "Su" on his mother's gold hairpin was stained with blood and imprinted on his heart. The loyal servant Tang Xiaoyi protected her with his life and took her on the run for seven days. Finally, she was entrusted to Chen Gang, the former subordinate of King Huan, in Zhenwei County. From then on, there was no Liu Dan in the world, only Chen Danfeng, who sharpened his skills in street cases.
During the eight years in Zhenwei County, she grew from a naughty child who mistakenly drew moon patterns to a "living judge" who solved cattle rustling cases and rouge poisoning cases. Old Zhou of Yizhuang taught her how to identify poisons, lame instructor Wang Zhenwu taught her swordsmanship, and old master Zhao Yong left a prophecy of "the moon is by the emperor's side" before his death. Every clue points to the mysterious organization with the moon pattern on its sleeves - the Moon Worship Sect. When she was eighteen years old, a piece of news from Ruixiang Tower made her determined to leave the county. Following the traces of the cinnabar account books and the moon pattern token, she got closer to the truth about the extermination of the Prince Huan Mansion.
The situation in the capital is treacherous, the Ruixiang Tower murder case leads to a human sacrifice conspiracy, the secret passage of Tianjue Temple hides the cries of children, and behind the smiling face of the Minister of Dali Temple, there is actually the light of the sword that chased her back. It wasn't until the eldest princess showed her half of the Xiangyun Jade Pendant that she knew she was a descendant of the royal family, and that the person sitting on the dragon throne was actually a false emperor supported by the Moon Worshiping Cult. Prince Ling's sneer, Concubine Liu's secret smile, and the moon-shaped birthmark on the false emperor's neck woven into a poisonous web covering both the government and the public - it turned out that the Moon Worship Cult had already sneaked into the emperor's side, and the blood that surrounded the palace was just the first step in their conspiracy.
From Yizhuang in Zhenwei County to the Jinluan Palace in the capital, from the autopsy knife to the sword of the King of Rings, Chen Danfeng used the jade pendant as his trust and wisdom as his blade.
