Lin Tian spent a thousand years checking in at the Underworld and obtained the Eternal Immortal-Demon Divine Physique. Once a revered powerhouse among the Underworld's ghost officials, he suddenly chose to be reincarnated. He drank Lady Meng's memory-erasing soup but secretly neutralized its effects with a supreme treasure, carrying his memories and cultivation from a thousand years into the Lin family, one of the top ancient clans in the Longevity Realm. Unexpectedly, he has a younger sister in the womb with him, the reincarnation of an Eternal Great Emperor who has lived through a hundred cycles of reincarnation and plotted for a hundred thousand years. Before either sibling is born, both already possess extraordinary opportunities, and they are destined to stir up earth-shaking waves in the world of immortal cultivation.