The “knight of time” is a secret agent unknown to the world who protects the order of time and space. After “Agent 007” loses his life, the good-for-nothing salesperson Shangguan Nao (Du Wei Han) is selected as the next knight of time “Agent 008” and immediately thrown into the tunnel of time without even receiving his special training. His task is to eliminate the terror organization “Nine-Headed Rat” who is currently threatening the Ming painter Tang Bo Hu into creating vulgar paintings and thus altering the present, turning it into a vulgar world. Shangguan Nao, however, arrives in the Warring States period by mistake. Unable to enter the tunnel again, he has to take the train of time that stops in every time period before arriving in the Ming dynasty. On his journey, Shangguan Nao makes many mistakes that alter history. When he meets the time connector Xi Zi (Sun Yu), the two join hands as she helps him bring everything back into order again.