He started human cultivation and it will be possible. I personally wished to see a full monster route for once, but alas it seems to have failed. We will see how it goes in the future.
In chapter 102 he gets a monster core. He is more of an actual monster than human and so is his cultivation.
If I remember right, he appeared just thrice and the third time he died. Furthermore they were only chance encounters and the young master did not use his spare time trying to kill the protagonist.
For example, there was this guy Dragon Li. The MC offended his grandpa (village chief) and you could say he humiliated his family (not intentionally, was just defending himself. But you know how it goes in xianxias). Also there was a short fight, it was not to the death and Dragon Li was able to swallow his pride and get on the MCs better side.
Examples: Wondering about why he feels so much bloodthirst. curious about how come that he is more bold. Awareness that he is slowly becoming a monster in both body and soul. Puking after his first massacre. Not killing everyone just because he is MC.