After being expelled from their 24th school for fighting, troublemakers Guan Yu and Zhang Fei are out of options—until Liu Bei, a royal student, offers to become their sworn brother and get them into the elite Dong Han Shu Yuan, in exchange for covering his tuition. But when Liu Bei is injured, a stand-in named Xiu takes his place. Gaining admission is just the beginning, as the trio must now navigate deadly school traps and rival invasions in a campus where survival is the real test.