Lin Fan was originally the most inconspicuous outer disciple of the Qingyun Sect. He was still stuck at the first level of Qi refining after three years of practice due to his incomplete spiritual roots, and was regarded as a "waste" by his fellow disciples. Su Muyue was a genius in the alchemy hall, possessing an innate "elixian eye" but was plotted by a traitor. Her alchemy veins were damaged and she was reduced to a handyman, and could only survive in the medicine garden.
During a sect mission, the two accidentally entered the ruins of the ancient demon realm. Lin Fan accidentally obtained the "Demon Slayer Sword Heart", and the incomplete spiritual root turned into a rare "demon slaying spirit body", which can temper the body with demon energy and slay demons to increase his power.
Just as the strength of the two of them was advancing by leaps and bounds, the Valley of Ten Thousand Demons invaded the world of immortality. The Demon Emperor led millions of demons to seize the "Secret Treasure of Demon Suppression" and subvert the order of the world. Lin Fan, who is at the fifth level of Qi refining, uses the Demon-Slaying Sword Heart to overwhelm the demon generals, while Su Muyue refines the "Demon-Breaking Pill" and "Heart-Protect Pill" to support her colleagues, and can even use the pill soul to control the spiritual plants to lay out the "Monster-Slaying Formation".
From fighting to the death in the demon realm to guarding the sect, from competing for ancient secret treasures to uncovering the ultimate secret of spiritual roots and elixirs, the two went from distrusting each other to sharing life and death. They used their mortal bodies to fight against the demon clan. On the journey to slay demons and seize treasures, they embarked on their own immortal path step by step, composing a fairy tale of "killing to stop killing, and using treasures to prove the way".
