Xiaren travels through the Tang Dynasty and becomes Fang Yiai. When he wakes up, he faces marrying Princess Gaoyang. He angrily rebuked his father for refusing to marry him, and in a hurry, he slapped Li Shimin, who was in disguise. When his life was at stake, he lied about offering an invention that could enhance the cavalry's combat effectiveness in exchange for his merits. Can this idiot candidate who talks nonsense use future technology to escape death and rewrite his own tragic historical destiny?