Lin Fan is an ordinary man struggling under the weight of debt and a marriage on the brink of collapse. Unexpectedly, he takes his daughter into a mysterious temporal mist and drives his ordinary van into the fictional Great Liang Dynasty, arriving at Jing'an Pass, a border fortress ravaged by constant warfare. The isolated fortress is desperately short of supplies, and its female general, Huo Qing, is struggling to hold the line. Using supplies and practical technologies from the modern world, Lin Fan establishes a passage between the two worlds. Together with his wife, Su Qing, he introduces improved seeds and equipment to enhance life along the border and resolves the many crises threatening the region from within and without. Meanwhile, he also tackles debt and business troubles in the modern world and works to mend his broken family. Traveling between two worlds, he helps revive industries along the border while protecting the simple happiness that belongs to his family.