There's a Demon Living Inside Me

My father is a farmer and my mother is a Weaver Girl. It wasn't until I was possessed by the Demon Lord that they had a showdown: one was the peerless Sword King who could cut through the galaxy with his sword, and the other was the Spirit Clan Saint who followed her words. They changed my fate against the will of heaven and then both disappeared, leaving me alone in the Immortal Sect, struggling to survive with the "devil seed" that will die in three years. Everyone treats me as trash and bullies me at will. They didn't know that the Demon Lord in my body was my best sparring partner, and that my seemingly weak body was an artifact that my mother had poured out with divine blood. I will use my spirit as my bones and my demon as my blade, not for the common people or for justice, but just to survive, find my parents, and then overthrow this hypocritical world!