Su Mo woke up from the other side of the River of Forgetfulness, forgetting everything he had done before, except for the obsession of "gaining from all living beings and giving back to all living beings". He entered the capital in a mortal body to take the exam, but was accidentally involved in a fairy situation. He gained the power to penetrate into the secluded world, and could see into the yin and yang and identify ghosts. From then on, he used the secluded world as a chess piece and the immortal road as a board, and he fought step by step amidst the strange things in the human world and the disputes in the immortal world. He not only wanted to find the past, but also fulfilled his destiny and found his own path to immortality in the impermanent world.