The Era That Began with the Classic of Mountains and Seas

​​Ancient book appears: Librarian Yu Xiao discovered a mysterious ancient book of "The Classic of Mountains and Seas" while sorting out his grandfather's belongings. Inside the book was a note that read "Ruins of Kunlun, the Land of the Immortal" and a strange jade pendant. ​​Mysterious Visitor​​: Yu Xiao is followed by a man named Xu Mo who claims to be a history professor. The other party claims that this ancient book records clues to the "Immortal Kingdom" and that her grandfather was an expert in studying this legend. ​​Family Secrets​: Yu Xiao discovers the coded diary left by his grandfather, revealing that he has been searching for a mysterious place where he can achieve "immortality" all his life, and this secret is closely related to the blood of the Yu family. Danger is coming: Unidentified people break into Yu Xiao's home to search for ancient books, forcing her to join forces with Xu Mo to escape. The two decide to work together to solve the mystery that has plagued her family for generations. ​​Embarking on a journey​​: Yu Xiao and Xu Mo set out for the Kunlun Mountains based on the clues left by their grandfather, looking for the legendary "Land of the Immortal", but they did not know that danger and the truth were waiting for them.