Xia Chi is a kind-hearted, smart and meticulous teenager, and is a member of the school's reasoning club. After a reasoning club activity, Xia Chi's girlfriend Qing Zhi, who had been involved in the "Ji Lu case", mysteriously disappeared. In order to find Qing Zhi, Xia Chi and his friend Meng Qin accidentally discovered a virtual game organization called "Duan Nao" and entered the world of Duan Nao games together. In one round of reasoning games after another, Xia Chi and Meng Qin experienced various tests of humanity and wisdom.