Yun Heng is a lone cultivator under the Heavenly Tower. He bears the "Forgotten River Seal" and is supposed to observe all things quietly outside the world. However, there was a thunderstorm overnight, and time and space were torn apart, and Yun Heng accidentally fell into today's bustling city. Amidst the noise of carriages and horses and the neon lights reflecting on the walls, all the magic he had cultivated was lost, leaving only a trace of his residual soul with him. Having lost his supernatural power, Yun Heng was able to glimpse the subtleties of people's hearts and the warmth and coldness of the city in the ups and downs of the sea of people. The secrets of the ancient immortal sect were also surging undercurrents, and they were quietly integrated with modern technology, causing waves.
He wanted to find his immortal power and return to the Heavenly Palace, but found that the path he was pursuing had been overturned by the world of mortals. Yun Heng struggles between the desires of all living beings and the clarity of immortality, asking what is reality and what is eternity. Is it a ferry crossing or a self-crossing trip? This collision between the human world and the fairy world will eventually reveal the mystery of fate and allow Yun Heng to write his own legend in the mortal world.