Internal and External Elixir

Zhang Lin, under the orders of an immortal, entered the world and emerged from the mortal world, solved the cause and effect, and at the same time practiced Yuan Zhen. As the only real person who masters internal and external alchemy in an era when Taoism is not revealed, what kind of waves will he make? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.