In the land of Longzhou, people fight by harnessing the power of their ancestors' heroic souls. In the era following the Three Kingdoms, the descendants of Cao Wei dominate, targeting the descendants of the Five Tiger Generals and forcing the Guan family into a political marriage. On the wedding day, Guan Yue flees and accidentally trespasses into a forbidden land, where she meets the invincible Yellow Spring gatekeeper, Liu Xuan. Recognizing her mother’s token and being addressed as her fiancée, Liu Xuan leaves seclusion to aid the Guan family. As their bond deepens, the Cao family's conspiracy gradually surfaces, and the mysteries of Liu Xuan’s true power and identity begin to unravel—thus igniting a storm of upheaval.