I'm thinking along those lines as well except the part where he made him drink something since it seemed he was dead while Qin Xian was trying to force him to drink something. This time he managed to get part of him in our Wang Yi. Such an unhealthy obsession o_o but we just can't help but read on...
What if he made wang yi (the system) drink something he bought with credits from the stories to make the system into a human who lives a normal life. But because the system is a system it can’t really feel and express human emotions, hence he was an odd kid and was psychopathic.
He could have bought something from the shop, but it didn't work or at least not the way he wanted or that it should have. Wang Yi was after all born in another world and grew up not knowing about systems until the bus accident.
So, maybe that legendary villain with the highest points(?) was Qin xian.. and his system was Wang yi..? And system wang yi became human because either one of them fall in love to the other, so that's why systems now have animal forms. And maybe in every story or world that wangyi entered, qin xian would be there because of something he made wangyi drink... according to what I understood on ch103.