Medieval Slave Breeding Manual

After Chu Weimin's death, he traveled through the medieval magical world of different races, magic, and knights. It was exactly the same as the other world works he had seen in his previous life. As soon as he traveled through time, the merchant Reis recognized him as a great noble and gave him a slave, who was actually a demon hybrid? The favor of the gods, the slaps in the face and all kinds of coincidences gathered at his door, but he was busy leading the little slaves around him to live a better life. But, why can't this servility be changed?