Guan Yu (Hu Yuwei) and Zhang Fei (Bo Yan) were repeatedly expelled from school because they were too chivalrous and always caused a series of troubles. Just when the two were desperate, a man named Liu Bei (Chen Dexiu) appeared in front of them. Liu Bei said that they were qualified to go to the best aristocratic school in the country, Donghan Academy, but the tuition was high and he could not afford it alone. Zhang Fei volunteered to solve the tuition problem, so the three of them became brothers. However, at this moment, a stone fell from the sky on Liu Bei's head, causing him to fall into a coma. The space-time black hole teleported four young people, Xiu, Wang Dadong, Ding Xiaoyu and Wang Arthur. In desperation, Xiu, who looked similar to Liu Bei, had to stay and pretend to be Liu Bei, while the other three prepared to bring the real Liu Bei back to the modern world to seek treatment.