Li Guanqi crosses over to become a disabled and playboy prince-consort of Great Zhou, cultivating and healing in secret with the help of a purple jade while laying out plans using his playboy identity. Marrying the Eldest Princess Su Mingyue, they join hands to control salt production, crack the imperial examination corruption case, and pacify the Jiangnan floods, while unmasking the Idle Prince's rebellion from behind the scenes. Just as the court politics begin to stabilize, a sudden upheaval erupts in the Southern Frontier, the Demon-Suppressing City falls, and Su Mingyue is forced into the Endless Black Forest of the forbidden realm, her life or death unknown. Li Guanqi resolves to no longer conceal his sharpness and rushes to the Southern Frontier—but the true undercurrent is only just beginning to rise.