The Chairman of Pharmaceutical Company is a Poison King

300 years later... On an Earth shrouded in mana.I was a Mana Rejector'someone for whom that very mana was a deadly poison.Then one day, as I was waiting for death, unable to even Awaken...I connected with an identical soul from another dimension.The soul of the Absolute Ruler of the Murim... The Absolute Poison Demon, Dang Gunak