Lin Chen, a modern all-around young man, is a champion in three disciplines: Chinese martial arts, Sanda, and Taekwondo. He is a top student and is obsessed with the history of the Sui and Tang Dynasties and modern inventions and creations. He has incredible looks but values love and justice. In order to help his younger brother repay an online loan, he unexpectedly accepted the heirloom jade Ruyi, but was hit by a drunk driver's truck on the way home. The blood activated the jade Ruyi, and traveled to the chaotic times of the late Sui and Tang Dynasties. He was bound to the "God of War System of the Sui and Tang Dynasties" to help Li Shimin ascend the throne and become emperor. Only then can he return to modern times. With modern knowledge and top martial arts, he healed his wounds while relying on his mastery of history. By chance, he got acquainted with Li Shimin, Qin Qiong, Cheng Yaojin, Li Jing, Luo Cheng, Xu Maogong and other heroes. He met many confidantes, resolved the crisis with humor, and selflessly controlled the strategy. He helped Li Shimin conquer the war in the north and south, pacified the four sides, and finally assisted him in ascending the throne and proclaiming himself emperor, completing the system's tasks, and returning to modern times with a legendary memory.
