Li Fan, a modern time traveler, unexpectedly became a living prince of the Tang Dynasty, but ended up on death row because of a little song. He was bound to the system and refused to be released from prison in order to complete the sign-in task. He accidentally recruited the current emperors Li Shimin and Wei Zheng. He established a school in Bianzhou, trained elite soldiers, and created new things. While concealing his identity and planning for a great cause, he dealt with "Old Li" and "Old Wei". A game in which the nine-year-old dragon subverted the structure of the Tang Dynasty began.
