After Failing to Overcome the Tribulation: They All Lied to Me and Finally I Became an Immortal

I, Yun Yan, am fifteen years old and a disciple of Qingyun Sect. When he woke up, he became the disciple of the Demon Lord and was told that he had been a demon for thirty years. I don't believe it. Until I saw it with my own eyes—— The spiritual jade bed that nourishes the soul is engraved with the sword marks of my origin. On the jade slip of Zhu Qiu, there is the handwriting of me who is possessed by the devil. Even my deceased master has an inexplicable connection with me. The whole world is lying to me, except my sword. When I slashed open the fairy gate with my sword, all the lies were shattered at that moment. It turns out that I am the only player in this game of chess.