Xiao Yao, a modern literature student, unexpectedly transmigrates into the body of Yang Guang, Emperor Yang of Sui, early in his reign. He has fragments of Yang Guang's memories and instincts, but his dominant consciousness is that of the modern-day Xiao Yao. He doesn't set out to ruin the country from the start. Instead, armed with a modern person's knowledge and values, some naive and some extreme, and a mistaken belief that he knows the future of history, he tries to “correct” or “speed up” its course. Combined with Yang Guang's own ambition, impatience, and suspicion, this leads him to make a series of decisions and take actions that seem “reasonable” or “innovative” at the time, but in fact plant the seeds of disaster or even directly ignite a crisis... ...