After Showing Off and Raising the Future Demon King, He Became Attached to Me Instead

The first day I dressed as the biggest villain in the book, the system forced me to accept the male protagonist as my apprentice! "Let his darkening value be cleared within three years, or else he will be killed!" Looking at the well-behaved and sensible future Demon Lord in front of me, I almost shook the apprenticeship tea in my hand - this kid is now the most innocent White Lotus in the book! Who would have expected that that night I would bump into him crushing the Nascent Soul monster with his bare hands. He turned to me and smiled sweetly: "Master, this is the dinner that my disciple hunted for you~" My daily routine suddenly collapsed! During the day, I have to prevent him from being bullied by the righteous and turning into a black man. At night, I have to stop him from secretly massacring people all over the house. The most terrible thing is that this villain uses his top talent to hit me in the face every day - where is the script for the good-for-nothing counterattack? ! Until one day the system suddenly screamed: "Warning! Why is the host's favorability so high?" Being pinned in the corner, I suddenly realized: Gan! Is this the wrong target for the rebel strategy? ! (The male protagonist's yandere value +999%)