Available as both manhwa and novel.
The Demonic Supreme Sword La Espada Suprema Demoníaca
Also known as: La Espada Suprema Demoníaca · La Espada Suprema Demoníaca Novela · Madojeilgeom · 마도제일검 · The Supreme Demonic Sword · The Supreme Demon Swordmaster · 魔道第一剣
The Soaring Heaven Demonic Cult achieved unification after 300 years thanks to Sama Geon. He had one wish: to live an ordinary life with his family. Returning to his hometown, he learned butchery and began a small business, but his younger sister's illness forced him to wield a sword once again—and the Soaring Heaven Demonic Cult is threatening his serene life. For the sake of peace, he must wield his sword once more.