Secret Burial of Mountains and Seas

What is hidden inside the bronze door that the Zhang family has guarded for generations? Is "The Classic of Mountains and Seas" fictional? Or documentary? Does the dragon in the Chinese zodiac exist in this world? Where does the prototype of the bronze sacred tree in Sanxingdui come from? Is there something hidden behind the Antarctic ice wall? Did Emperor Qin really go east to sea just for the elixir? Have all the alien creatures that appeared many times in ancient books really disappeared? These problems once troubled Zhang Yulou, an ordinary person. Until late that night, a group of people broke into his home. Kirin blood was injected into his eyes... From there, the truth hidden behind this world begins. Uncovered bit by bit! [A little bit of tomb robbing notes + no system + suspense + layout + Classic of Mountains and Seas]