The civil engineering genius of the 21st century accidentally traveled to the Jiading period of the Southern Song Dynasty (in the early 13th century, the three forces of Song, Jin and Mongolia were intertwined) and became the son of a criminal official who was exiled to the "Yunchuan Fort" in the border city for offending a superior official. At the beginning, there was only a dilapidated city wall and dozens of soldiers and civilians with sallow faces. Lu Mingyuan started from scratch and used modern knowledge and technology to build an unfinished border city into a dominating war fortress and prosperous commercial center. Finally, in the cracks between the three forces of Song, Jin and Mongolia, he established his own power and rewrote history.
