Yun Yao, the last heir of Kunlun's surviving lineage, sets out with a Kunlun jade token and a bronze command token on a quest to find fragments of the Worldheart Stone and reinforce the Eternal Barrier. A thousand years after the great war among the three realms, the Demon Realm was sealed in the abyss. Now, chaotic evil is stirring once more, and the Dark Pavilion has joined forces with the Demon Realm, seeking to seize the fragments and destroy the barrier, plunging the world back into war.
They first meet on Mount Cangwu, where she unexpectedly joins forces with Qin Jue, the third prince of the Dayin Empire, who claims to be "inspecting the border" under imperial orders. Qin Jue seems gentle and refined, but in truth, he is a cautious man who grew up fighting for survival in the imperial palace. He carries royal secrets and a Boundary-Calming Talisman, and secretly intends to use Yun Yao's Kunlun bloodline to gather all the fragments. Yun Yao is aloof and proud, accustomed to going it alone, but she must rely on Qin Jue's influence and resources to avoid danger. Each gets what they need, forming an alliance that appears to be built on trust.
The illusions beneath Soulbreak Cliff, the tragic pasts of the Dark Pavilion's assassins, and the ever-present dangers of the Demon Realm's abyss gradually give rise to complicated bonds along their calculating journey together. Qin Jue's deliberate advances and the occasional sincerity he lets slip, Yun Yao's wariness and unintentional tenderness: the two are pulled in opposite directions as the fate of the three domains hangs in the balance. As the secrets of the Worldheart Stone, the ambitions of the imperial family, and Kunlun's mission are revealed one by one, are they merely pawns using each other, or can they join hands to cross the Nine Provinces and protect the people?
On their mist-shrouded journey, schemes and betrayal intertwine, while warmth and murderous intent coexist. In the end, they must make a choice amid love, hatred, passion, and the fate of the world.
