There is a saying among those who learn swordsmanship that all swords have souls, so the swords also have personalities, and the personality of the sword comes from the personality of the wielder. Therefore, there are no two swords in the world that can wield exactly the same sword skills. Even if the moves are the same, the aura between the moves is different.
The killing knife also has a soul. The moment he acts like an animal regardless of the soul of the knife, the wielder of the knife is disqualified in the human world.
But when the sword students pick up a real sword on the first day, the master will tell them that the sword in their hands kills people, but they are also killed by others. They must either put down the sword and accept death, or hold the sword tightly and cut off their fate with the enemy!