Well, on this update shows more about the mystery of both Father & Mother and John. If the past updates made clear some stuff, is that Orb isn't too subtle on showing where the plot is going. Saying that, I agree with some people around here that shows that MC could be John's son, but what surprises me is that neither MC parents seems to know John before that, neither carry any of grief on him - their problem is with his aunt.
I can only think in two, maybe three alternatives for that: Mom & Dad compromised MC's future with some kind of debt and the time is approaching for them to pay, MC could be son of his aunt and John could be his father, or even thinking out of the box and say that it doesn't have any relation with neither of them, and that's why John wants him to suceed on the Magic Grand State and Aunt is between that in some way.