In the mysterious waters of the South Pacific, an unmarked "mysterious island" suddenly issued a secret invitation to explorers, scholars and weirdos from all over the world, claiming that the island contained ancient treasures that could change their destiny. Young adventurer Lin Yu embarks on a journey with his friend Su Yao because the symbol left by his grandfather matches the invitation letter. However, after landing on the island, they not only have to face the mist-shrouded jungle and bizarre ancient ruins, but also deal with their fellow travelers with their own ulterior motives - a retired agent who is good at tracking, an archaeologist who is obsessed with semiotics, a mysterious masked man, and a group of islanders who seem to know the treasure route well.
As the clues deepen, the so-called "treasure" gradually loses its gold and silver halo, revealing the truth related to ancient civilization, the mystery of the grandfather's disappearance, and the hidden ecological crisis on the island. Every decryption is accompanied by a deadly trap, and every ally may be hiding a betrayal. When Lin Yu discovered that the core of the treasure was actually a "forbidden book" that recorded the energy balance of the island, a bigger conspiracy emerged: someone was trying to use the power of the treasure to cause disaster, and his grandfather's disappearance may be to protect this secret. In the end, Lin Yu and others must face the dual threats of natural backlash and man-made calculations to uncover a century-old mystery and make a choice between protecting the cultural heritage or exposing the conspiracy.
