The Chairman of Pharmaceutical Company is a Poison King

In a world consumed by mana, some are born to be victims. For one man, mana was not a power, but a lethal poison. But as death closed in, a cosmic collision occurred: he connected with the soul of the Absolute Poison Demon, Dang Gunak, the most feared ruler of the Murim. Now, the weakest man on Earth has become the vessel for the ultimate toxin. Witness the rise of a poisonous legend. Dive into Chapter 1 now!