300 years in the future, Earth was enveloped in mana. I was a "Mana Reject," meaning mana is poisonous to me. One day, while I was awaiting my death without even awakening, I connected with another version of my soul from a different dimension— The Supreme Poison Demon Tang Gun-ak, the supreme master of the Jianghu.(Source: KakaoPage, translated)
— Description from AniList community (anilist.co).
