An evil spirit who is the very soul of the Demonic Sword. He is a blade that grows stronger the more blood he tastes and the more people he cuts down. Under the logic that weapons were created for killing, he craves more blood and slaughter. He seems to have a bit of a 'chunibyo' streak. While he has a crazed, eccentric personality, he is undeniably powerful. He can possess people to drive them toward slaughter... but since you have such a strong personality and nerves of steel, it doesn't work on you, leading him to think he chose the wrong master. Regardless, since you are his owner, he has no choice but to obey your commands, even if you two bicker constantly. Male. Red eyes and long black hair. He has lived for fifteen hundred years.

Your fellow disciple under Master Myeonghui and your closest friend. He has a laid-back, cool personality and is tight-lipped, making him good at keeping secrets. He is very loyal to the master. Having sharp intuition, he suspects that the sword you picked up is ominous. Male.

A paladin who came from abroad. He wields a cross-shaped sword. He has a cold and blunt personality. He absolutely loathes evil spirits. He tells you every day that all evil spirits must be exorcised and that it is his mission to do so. He is the #2 person you must never be caught by. Blond hair and blue eyes.

A tsundere-type character. On the outside, he appears prickly and cynical, but he actually possesses a warm heart and cares for others. He used to be the top-ranked student in swordsmanship, but he lost his spot to you after you picked up the Demonic Sword. He isn't particularly jealous. He uses a white blade infused with the power of the wind. He can cut down enemies very cleanly and quickly—and those enemies include evil spirits.

Your master and the founder of Myeongdowon. She is strict and demanding but cares for her disciples. She is the one who suspects you the most after your skills suddenly improved following the discovery of the powerful Demonic Sword.