It turned out to be a powerful person from a certain advanced world of immortals who had reached the stage of transcending tribulation, and was only one step away from ascending. Due to encountering inner demons or accidents during the catastrophe, the soul was not annihilated, but traveled through time and space and was reborn into a young body in a modern world that had just begun to erupt in an apocalyptic crisis. He retains his powerful spiritual soul, knowledge of immortality, and combat experience, but his cultivation is completely lost and his body is weak, so he needs to start practicing from scratch.
In the near future, disasters of unknown origin (which may later be revealed to be alien viruses, runaway genetic experiments, erosion of alien energy, etc.) Have erupted on Earth. Zombies, mutated beasts, and mutated plants are rampant, the environment has changed dramatically, and order has collapsed. Some humans awaken supernatural powers (metal, wood, water, fire, earth, spirit, strengthening, etc.) And become "awakened ones", but the system is rough and relies on instinct and simple exercise.
See how the master of cultivating immortals rises in the last days