Lin Chengjun, the guardian of the mausoleum, accidentally activated the ancient book "Xuanhuang Jing" buried with him in the seventh year of guarding the mausoleum in his ancestral temple, and awakened the ability of "causal deduction", which can deduce exercises, see through the game within the game, and predict crises. In the early stage, he forbeared and pretended to be an ordinary person, until the first showdown when a monument was maliciously smashed and the family was forced to move the ancestral grave, and he used deduction to crush the provocateurs; subsequently, as the level of "Xuanhuang Sutra" increased, from Shouling Village to the city, and then to the ancient martial arts world, he directly used heaven-defying methods every time he was questioned, using the showdown operation of "I had deduced this far" to defeat all forces. Finally, the connection between "Xuanhuang Sutra" and the ancient cause and effect catastrophe was revealed, and he became the savior who controls the cause and effect.