A young man called Yun Buqi travels through time to the Zhenguan Reign Period accidentally. Then he comes across Li Anlan, who looks exactly like his deceased girlfriend. They cross paths. Yun has to use the name of his ancestor “Yun Ye” to live in the Tang Dynasty. He knows nothing about politics and military affairs. However, he is predestined to write his extraordinary story with his learning in this era featuring swords and brush pens.