Love from past lives, sought in dreams. Peace in the country, heroes made! The film is a sister film of "The Myth", telling the story of Professor Fang (Jackie Chan) who unearthed a mysterious ancient shaman jade during archaeology. It led Professor Fang and his assistant Wang Jing (Zhang Yixing) back to the Western Han Dynasty in their dreams, where they transformed into brave and combative generals of the Han army, fought in the boundless Hexi grasslands, led cavalry to fight against the Huns to protect their country, and started a love affair with the Huns princess Mengyun (Naza) that spanned a thousand years. In order to find the truth, Professor Fang and his assistant invited their good friend Lei Zhen (Li Chen) to go deep into the glacier to find the holy place for offering sacrifices to heaven, in order to uncover this unknown legendary story that spanned thousands of years, but they were obstructed by the shaman expert Herber (Aarif Lee)...