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Lin Qi, a mortal blacksmith apprentice, fell into an ancient cave and accidentally found a mysterious bone fragment. He awakened the "Dong Zhen" power - he can analyze all things and deduce Kung Fu and prescriptions, but at the cost of burning his lifespan! With low qualifications, he managed to enter the immortal world with this technique. In order to survive and make progress, he hid in the elixir shop and worked as a fire boy. He secretly analyzed the leftover residue and used his longevity as fire to refine cheap elixirs with unique effects in exchange for resources. However, the elixir attracted the greedy attention of Chen Xiao, the disciple in charge of the workshop. His identity was exposed, powerful enemies surrounded him, and when his life was about to expire, Lin Qi, who was seriously injured, was forced to escape into the Valley of Ten Thousand Miasma, a place where the world of cultivation has become famous. Armed with a map of hope deduced from the bone fragments, with the strange poison "Soul-eating Grass" as the key, he resolutely stepped into the poisonous miasma, desperately searching for an unknown way forward and an opportunity for reversal in the countdown to life. This is a thorny and bloody road of exchanging lives for the road.