This article is not original! People with chuunibyou like to read fantasy novels and play fairy tale games. However, the system of Chinese mythological stories cited in such works is relatively confusing, and the magical creatures that appear in them are also various. In order to satisfy my obsessive-compulsive disorder and curiosity, I read the Classic of Mountains and Seas. This article is a compilation of the Classic of Mountains and Seas, and can be regarded as one of my own reading notes.