After the writer Ling Xiao met the painter Huaying Liunian in a border school, they investigated the secrets of the abandoned church in the town together, and received an anonymous letter warning during the process. They met the swordsman Shen Mohan, learned that the town had hidden legends related to demons, and decided to look for mysterious treasures. During the adventure, they also met the doctor Bai Qianxi and the mysterious woman Mo Liusu. Everyone explores underground, encounters monsters, and finally finds clues behind the stone door. They learn that they need to find five mysterious gems to re-seal the mysterious power. They grouped into groups to search for gems, experienced hardships in beehives and other places, gradually unlocked the secret of the crystal box, and continued on their journey to find other gems.
