The Fourth Book by Dong Xun Jiu Gu

Lin Ye, a university student, transmigrates into the world of Versatile Mage and becomes an ordinary student in Bo City. He had hoped to grow in peace thanks to his talent for the Lightning Element, but the crisis in Bo City forces him to awaken the Demon Element. From then on, he struggles between his dual identities as human and demon. Using his knowledge of the story to establish the “Nightfall” organization, he moves among the forces of the Holy City, monsters, and humanity, ultimately uncovering the truth of the world and breaking the shackles of fate.