Xiao Yi, a god-level alchemist who has been trapped in another world for two hundred years, accidentally traveled back to his youth in the 1970s. He pursues Yang Xi, a female educated youth whom he had a crush on back then, and declares in front of everyone that he will protect her for the rest of his life. Grow elixirs, refine elixirs, and transform into medical immortals to treat various complaints. Big bosses from all walks of life came to ask for medicine and showed their hospitality.
The alien monsters that escaped from the depths of Wudou Mountain continued to harm the world. Xiao Yi had no choice but to fight monsters, refine the monsters, and collect demon pills, and at the same time lead the villagers to make a fortune with alchemy. While guarding the woman he loves, he also guards the mountain guarding formation that connects the other world and the present world.
