Ancient Swordsman

So what if you are a demon, so what if you are a fairy. If not accepted by this world, immortals can eventually transform into demons, and demons can eventually transform into extremely evil beings. Thousands of years ago, I was the demon who destroyed the world. Ten thousand years from now, I will be the swordsman who saves the world. Love originates from the green mountains and travels to all corners of the world. Smoke rises in the wasteland, and the swordsman cuts through the wasteland.