Young Lin Xuan was gifted since childhood, but due to the destruction of his family, he was forced to live in the mortal world. By chance, he obtained the "Tianyan Sutra" left by ancient monks and embarked on the path of cultivation. In the process of searching for power, Lin Xuan gradually discovered that his life experience was closely related to a catastrophe that swept the world of cultivation. He got acquainted with the mysterious swordsman girl Bai Li, the cold young demon master Qing Yu, and the demon genius Ye Wushang, who was both good and evil. The four of them traveled together to enter the secret realm and fight against powerful enemies. However, as his strength increased, Lin Xuan discovered that the real enemy was not the external demons, but the conspiracy hidden at the pinnacle of the world of cultivation. A disaster related to the life and death of the world is brewing, and Lin Xuan's power of Tianyan is the key to breaking the situation. In the intertwining of friendship and betrayal, love and hatred, Lin Xuan must make a choice between path and destiny in order to save the common people and become immortal. The story shows the struggle of human nature and the impermanence of heaven in the fantasy world of cultivation.