The archivist Xiao Hongyu is actually a low-level monk of the Qingyun Sect. Because she discovered the secret of the collusion between the underworld and evil cultivators in the old files, she was hunted down and on the verge of death. The natural turtle-shaped mark on her chest unexpectedly awakened. He was expelled from the school and ended up at a construction site, but he broke through the cultivation level due to the mark. He also learned that the Qingyun Sect was destroyed by the evil cultivator Yinluo Sect and the underworld leader Lin Cangming, and his master died tragically. Thanks to the help of Master's old friend Chen Xiazi, Xiao Hongyu practiced "Nine Transformations of the Hidden Dragon" to break through the foundation building period, and learned that the Yinluo Sect would hold a blood sacrifice with hundreds of lives at the ancient house in Nancheng. Bearing a blood feud and the heavy responsibility of saving the world, Xiao Hongyu and Chen Xiazi join forces to embark on the road of revenge to find the ancient treasure Zhengyang Cauldron, crack the Yinluo Formation, and prevent the blood sacrifice. The dormant dragon will eventually awaken and use the power of righteousness and yang to quell the yin evil.