After his grandfather died suddenly, 18-year-old Lin Chengdao went to Zhongnan Mountain with a blood-soaked willow coffin to find his uncle, and was involved in the secret realm of Maoshan Mountain. The strange visions in the coffin at the vigil, the paper figurines in the bamboo forest behind the mountain, and the strange changes in Qin Yi, a classmate, reveal the mystery of the blood coffin in the grandfather's last words: "the willow coffin will be soaked in chicken blood for seven days". With the emergence of "Secret Records of Yin and Yang", the conspiracy of the Nether Palace to resurrect the Corpse King through the bloodline of "Yin Yang" came to light, and Lin Chengdao gradually discovered that he was the key to the corpse pit in Qianshan eighteen years ago - his blood was the key to the gate of the underworld. When the ceremony of passing down the body was reduced to an altar for evil cultivators, and when the identity of his close relatives became a mystery, he stood with his sword in hand, and in the yin and yang gap where the spells and corpse aura intertwined, he explored the truth that had been locked in the blood coffin for eighteen years: Who is the real "Yin Yang"? Is it the corpse contained in the blood-soaked willow coffin, or the thousand-year-old corpse king in his bones and blood?
