Cultivation of Immortality Please Be Rational

Zhang Da, an ordinary employee who was bullied by his superiors, unexpectedly obtained the "Original Qi Refining Technique" and the mysterious system, and then embarked on the path of cultivating immortality. In the city, he relied on his ability to cultivate immortality to fight back against workplace bullying and gain confidence. By chance, he came into contact with the mysterious "Netherworld" and evil cultivators. With the successful refining of the alchemy furnace and the refining of the "bone-eroding black mist", Zhang Da gradually uncovered the cruel tip of the iceberg in the world of immortality. Facing unknown dangers and powerful enemies, can he rely on the system and his own efforts to counterattack all the way and become a truly strong man?