The original work of the Spirit Cage was written by Xiao Ding, a Chinese web novel. The novel was published in 2013, and it was a fantasy adventure story with supernatural phenomena as the main clue. The protagonist of the novel was a young woman named Cheng Lingsu. She gradually mastered the abilities of various mysterious creatures through contact and experienced many thrilling stories in her adventures. The original Spirit Cage was deeply loved by readers and had been adapted into many forms such as television dramas, movies, and comics.