A modern rich heir gets drunk and falls into the sea, only to transmigrate into the body of Xiao Junlin, the spineless heir to the Prince of Zhenbei in the Great Xia Dynasty. He abandons his former submissive ways and uses an intelligence system and modern thinking to take charge of the heroine, crush his romantic rivals, and outwit the emperor and powerful ministers. Step by step, he takes control of the Northern Frontier's military power and wins over influential figures at court and beyond. In the end, he boldly leaves the capital for the Northern Frontier with civil and military officials and a mighty army, beginning a new chapter.