At the End of the World, I Will Save All Sentient Beings by Practicing Dual Cultivation

The apocalypse suddenly broke out and zombies were rampant. Lin Feng unexpectedly acquired the dual cultivation technique, and from then on he reached the pinnacle of life and became invincible in the world. Only the protagonist could cultivate immortality. Without aura, he could only rely on dual cultivation to improve his cultivation, fight against zombies, and protect everyone around him!