The youngest daughter of the Sichuan Tang family was kidnapped.
Cheon-hwi, the Sword Demon, began wielding his sword to escape hunger and rose to the level of a supreme master. The Central Plains spiral into catastrophe with the arrival of the Heavenly Demon, the greatest warrior of all time and a veritable disaster for the martial arts community. Cheon-hwi forms a deep bond with Dang So-wol, the Dukmuhou of the Sichuan Tang Clan, who was left alone after losing her entire clan to the Heavenly Demon, and joins her in her quest for revenge against the Heavenly Demon. However, the tips of their swords fail to reach the Heavenly Demon, and they meet their deaths on the same day in the same place. If only he had had a little more talent. If only he had had a little more time. If only he had mastered a stronger martial art. At the height of his regret, Cheon-hwi returns to the past twenty years ago. Having quickly regained his original abilities, the "young" Cheon-hwi resolves to protect her this time. Thus, he seeks out Dang So-wol, who is making her debut in the martial arts world at nearly twenty years old, and… kidnaps her.
