It turns out that Si Jinnian (the male protagonist), a freshman at a certain police academy, inexplicably traveled back to the Tang Dynasty after experiencing a detective competition! Wanting to return to his original world, he began to practice martial arts and sword practice with a mysterious old man. Soon after, the old man asked him to go down the mountain to complete his mission, but what Si Jinnian didn't know was that there were more dangerous cases waiting for him to solve...
