18-year-old ordinary high school senior Jiang Chen accidentally travels to a parallel world where intelligence has regressed. Here, ordinary people calculate by counting on their fingers, a divine dog that can count to three is considered a miracle, and Go has long been lost because its rules are too complicated. Armed with a complete middle school education, Jiang Chen starts by making a fortune selling goods on the street, then solves a thousand-year-old puzzle in three lines and becomes legendary overnight. He uses criminal investigation techniques to crack a serial murder case and crushes professional players at a chess academy with Gomoku. However, the existence of a super AI called Brain Terminal, created by a genius 10,000 years ago, a mysterious organization called the Intellectual Domain that hunts down geniuses, and the truth behind Bai Bing's parents' tragic deaths gradually reveal a conspiracy spanning 10,000 years.