Eunho, the strongest being in the world of monsters, lost the woman he loved and descended into a life of slaughter. Then, he was given a chance to become human. For a thousand years, he accumulated good deeds in hopes of giving up his immortal body. At last, he passed through the gates of reincarnation… Only to find himself human, holding a sword for the very first time and learning martial arts from scratch. But somehow… it all comes far too easily?