Jeyakoesa Hoejangnimeun Jeoldaedongma
제약회사 회장님은 절대독마
In a future 300 years ahead, the Earth is surrounded by mana. The protagonist is a "Mana Reject," someone for whom mana is toxic. Despite waiting for death and failing to awaken any abilities, the protagonist links with an alternate version of their soul from another dimension—Tang Gun-ak, known as the Supreme Poison Demon and top expert of the Jianghu.