Li Changge, a common man who is full of ambitions, is in desperate situation due to an accidental murder. He is arrested by the government and his life hangs on a thread. Unexpectedly, Princess Li Lizhi of Changle had a keen eye and appreciated his talent and justice. She interceded for him in front of Li Shimin and gave him a chance to make meritorious deeds by going to the border with the grain transport convoy.
The situation on the border is turbulent, and the Turkic army is eyeing it with frequent provocations. Li Changge relied on his past life memories and his identity as a descendant of the Mohist giant, and he was proficient in the art of war and machinecraft. He wanted to show off his skills, but he was questioned and made things difficult by the veterans in the army. Faced with the distrust and fierce opposition of the veterans, can he skillfully resolve it with wisdom?
Moreover, Changsun Chong was jealous of his interaction with the princess, so he secretly colluded with the enemy and repeatedly framed him, putting him in a life-or-death crisis. And his relationship with Li Lizhi has also been tested in the exchange of letters. In a tense situation where the war is about to break out, can he skillfully use mechanical skills to set up a defense line and repel the Turks with unique tactics? Can they uncover evidence of collaboration with the enemy amid numerous frame-ups, clear their grievances, and gain love?
See how Li Changge went from obscurity to fame in this crisis-ridden border battlefield, composing his own passionate legend and protecting the peace of the Tang Dynasty's borders and the people.