Sword Master's Bizarre Otherworld: Immune to Corruption

Armed with a system that grants immunity to otherworldly corruption, a master swordsman carves his path through a world infested with terrifying alien entities. Where others fall to madness and mutation, his greatsword cleaves through eldritch horrors with impunity. But there's a catch—his sarcastic system won't shut up, and every "reward" comes with deadly missions. Fail, and face forced execution. Single female lead accompanies this darkly humorous journey through a bizarre reality where steel trumps supernatural dread.