In a Joseon era where demons and humans coexist, the legendary celestial horse sword has been hidden on the land by demons. Rumors spread that whoever pulls the celestial horse sword will gain absolute power by being possessed by a celestial horse. As the power of the demons holding the sword grows stronger, the situation becomes challenging for the royal army to handle. The King of Joseon, deeming it unacceptable to stand by, secretly organized a group called the Ghost Blood Order to combat demons and bring peace to Joseon.

The Ghost Blood Order, led by their chief, flees with their subordinates to the mountains after realizing the King's plan to disband them secretly. Joining forces with the independent Hwalbindang, they set out to establish a new Joseon and search for the celestial horse sword. Amid the power struggles surrounding the celestial horse sword, a war between factions unfolds, determining the fate of Joseon.

Choose between the royal army, the Ghost Blood Order, or the demonists to nurture and become the strongest in Joseon. Engage in stylish swordsmanship action based on swords, automatically defeat demons in an endless idle RPG, and enjoy eye-catching graphics with a variety of skill effects and powerful martial arts. Form alliances with demons you defeat and partake in various rich content, including battles with demon kings and item collection and enhancement.