In the 3700th year of the Great Wilderness, the spiritual energy of heaven and earth was exhausted, the rules of the world of immortality collapsed, and the ancient immortal sects that once dominated the world fell one after another. The remaining sects huddled in the "remnant realm" with thin spiritual energy, struggling to support themselves. Guo Longlong, a young man from a border town whose parents died when he was young, makes a living by selling herbal medicines. However, due to an accident, he awakens the "Sky Burning Fire" hidden in his body when he is about to die - this is the most powerful origin left by the ancient Vulcan, and it is also the "forbidden power" coveted by all the major forces in the world of immortality.
In order to protect the only remaining relatives and friends around him, and to explore the truth behind the mysterious disappearance of his parents, Guo Longlong embarked on the road of cultivating immortality. He not only has to deal with the cultivation dilemma caused by the depletion of spiritual energy, decipher the hidden space cracks and ancient formations in the remnant realm, but also evade the pursuit of the "Tiandao Alliance" - this sect that controls the order of the remaining immortal world, regards the Burning Sky Fire as a heresy that threatens the balance of heaven and earth, and vows to destroy it.
