Yunshi was a modern high school student who was always at the bottom of the exams. However, he accidentally traveled to the Hongwu period of the Ming Dynasty when he fell asleep in class. When he woke up, he found that he had become a college graduate from the Imperial College who had not reformed despite repeated education. He was also bound to a deceptive "space confinement system" that could lock people into a different space, but every time he used it, he would consume "learning points". But what he lacks most is knowledge! In order to survive, Yun Shi could only bite the bullet and pretend to be a ghost under Zhu Yuanzhang's nose, and use the fallacies of modern scholars to fool the ancients. From the Imperial Academy to the Jinyi Guards, from Yingtian Mansion to Peking City, he avoided the pursuit of villains and powerful officials while using his space abilities to resolve crises. While it was full of jokes, it unknowingly changed the direction of history. As space capabilities gradually upgraded, Yun Shi discovered that there was a greater secret hidden behind this system...
