Flawless Blade Instinct

Hero, who was chased out of his home because he had destroyed his ki center, lived life as a third-rate spy after he was kidnapped by the Blood Cult. One day, he found the legendary Hidden Record of the Sword Sage and died trying to use it. But, he returns to the day he was kidnapped by the Blood Cult ten years ago and obtains the power of being able to hear the voice of the sword.