Muhyeon Gungmuindo

The Muhyeon Palace (無紋弓), a bow without strings that can kill anyone, and the Muin Island (無刃刀), a sword without blades that can't be pierced. Their journey together began. In the midst of the world's great injustice, wrought by narrow-mindedness, self-righteousness, greed, and resentment, one became a killer, the other a treasure. And so, as if by fate, they began their journey together.

(Source: Mr.Blue, translated)