The story takes place in an era when yin and yang are out of balance and solar terms are disordered. Forty-nine-year-old Shuo Siyu, a down-and-out scholar, accidentally touched the ancient seal while worshiping his ancestors at the family's abandoned "Si Guo Cliff" during the Cold Food Festival. The dormant demon soul in his body awakened and obtained half of the "Underworld Extradition Curse". Forced to embark on the path of cultivating immortality, he started from the "Beginning of Spring Realm" as a middle-aged man, struggling to adapt to the cultivation rules of the changing seasons. In the "Rainland Realm", he met the "Concubine of the Rain Master", a girl who was half human and half demon due to a mistake in her training, and was also looking for her own path, and was involved in the conflict between the local "Xi Clan" and the "You Clan" over the competition for the "Hunyuan Gas" mineral vein. As his cultivation level increased to "Demon Core Condensation", Shuo Siyu's sealed memories began to recover in fragments. He discovered that he was no ordinary scholar. His past life was closely related to the ancient Yin-Yang War and the loss of the "Hunyuan Wuji Formation". He must practice the "Nine Transformations Mysterious Technique" to balance the increasingly conflicting demonic power and underworld curse power in his body, while avoiding the pursuit of the two clans, and dealing with those "lost-hearted demons" who were "rescued" by him with the extradition spell, but madly retaliated for losing their true self. His journey runs through the twenty-four solar terms, and he finally faces the truth of his own memory in the "Wuji Dao" - he is the reincarnated spiritual consciousness of the ancient man who tried to reconcile yin and yang with the "Hunyuan Wuji Formation" but failed, and finally sealed himself. He must make a choice: to completely restore his strength and memory and become a new "god", or to use the "me" in this life to find a new path that is different from the previous life, truly connects heaven and man, and reconciles yin and yang. ",
