Secret Lord of Mountains and Seas

In a modern society where technological civilization is booming, a blogger captured a UFO in a live broadcast, which was suspected to be a legendary dragon, sparking heated debate. Yun Muqing commented below: "It's fake, it's AI. You have to believe in science." A classmate said that he had seen an immortal flying with a sword. Yun Muqing said: "It's fake. It must be hallucination caused by eating too much wild fungi." Until one day, Yun Muqing got a special "Book of Mountains and Seas", and his understanding of the world changed forever.