This Person Is Originally a Foreigner

I was once the youngest seventh-level venerable in Kyushu. I seemed to have traveled across Kyushu with my luck. I was cold and aloof, untainted by dust. Everyone wanted to call me a legend in my life. Until my stubborn little apprentice died in my arms. From then on, I became obsessed with becoming a demon and sacrificed my blood to the common people. They said that I was a world-destroying demon who deserved to be punished by heaven. But they don't know that I am also a wandering soul, just looking for a destination.