"Eun-ho was the strongest in the monster world! Losing the woman he loved and committing murder for her gave him a chance to become human. He passed through the gate of his reincarnation by accumulating merit for a thousand years to abandon his immortal body… When he became human, he took up a sword (劍) first and started learning martial arts (武功). But isn't this too… easy?" What do you think about this manga?