120,000 YEARS AGO, THE FIVE REALMS LIVED IN HARMONY...
...until the Five Poisons ascend from Hell and threaten to destroy everything the Gods have sworn to protect. The Eight Immortals are summoned to Kunlun and paired up to begin the search for artifacts needed to construct the Mirror of Retribution in order to seal the Five Poisons.
Liu Lihua and Feng Huiliang, the strongest of the Immortals, are assigned to each other. Huiliang and Lihua butt heads on how to gather the artifacts and solve the overarching problem, but as time goes on, they find themselves falling into each other. Their forbidden love is tested by time and the laws of the universe as they fight to maintain their bond through three lifetimes.