Master Dressed as a Devil

Gu Linfeng actually wore a book! What he is wearing is a world-destroying book in which the male protagonist turns into a demon and eventually destroys the world! ! ! The system requires that if Gu Linfeng can prevent the death of the male protagonist Yu Muyao within a hundred years, he will be sent back to his own world. Gu Linfeng decided that in this life he would snatch Yu Muyao from his original unreliable master and take him as his disciple, and he would become Yu Muyao's master! Comprehensive teachings on morality, intelligence, body, art, and labor, use warmth to empathize with the male protagonist, and prevent the destruction of this world. I don't know why, although the disciple's character is becoming more and more peaceful, the look in his eyes is getting weirder and weirder. It's like... You want to swallow yourself. One hundred years have passed, and Gu Linfeng has succeeded... Half of it. He never expected that after he saved the world, he would get involved in it. His person, and his heart. Yu Muyao: If something happens, I will do my best. Master, you don't need to touch me. I will serve you and make sure you are satisfied. Gu Linfeng: Woo... Wuwuwu... [Non-serious ancient style] Intention: bathe in industry fire and become a phoenix