On the Jiuzhou Continent, immortals and demons coexist, yet the righteous and the wicked cannot abide one another. An ancient war between immortals and demons left this land drenched in blood as the righteous path and the demonic path clashed. Legend has it that a hidden realm known as the “Immortal-Demon Ruins” lies somewhere in Jiuzhou, sealing an ancient demon god capable of destroying heaven and earth. The immortal path sees the ruins as a desecration, while the demonic path covets the return of the supreme power within. As the seal on the Immortal-Demon Ruins gradually weakens, forces across the land stir, each seeking to seize the legendary forbidden power.
Xu An, an ordinary young orphan from a mountain village, is drawn into the conflict between immortals and demons by a chance mishap. As he cultivates at the Xuantian Sect, he meets Su Qingling, a prodigy of the righteous sects, and they fall for each other. Yet the divide between the immortal and demonic factions weighs heavily on them, while misunderstandings and choices become a seemingly impassable gulf. Yue Ning of Lingyin Valley binds him with the ties of friendship, while Xiao Ruyan of Wuxiang Palace tests him with the temptations of the demonic path. Torn between righteousness and evil, Xu An struggles to find his way, gradually uncovering the truth of the ruins and the fate sealed within himself.
Betrayals, misunderstandings, and humiliation follow one another in this war between immortals and demons. One important person after another falls. In the final battle, Xu An seals the demon god with mortal strength, choosing to sacrifice himself and become the guardian of the ruins. His story becomes a legend throughout Jiuzhou, while the life-and-death bonds he shared with the three people he loved most become tales of a bygone love, etched into that vast and desolate land.
Dust returns to dust, earth to earth. Only an unnamed spirit remains in the Jiuzhou Ruins, watching in silence until the ages themselves fall to ruin.
