Every time I see the parents-flashback, I just keep thinking about how they might've underestimated their kid. There's a huge difference between the wants of a child that changes every Thursday, and the MC's passionate dedication to the craft. When you're actually able to sit your ass down and practice those skills to such an extent, when you actually prove that "it's not just a passing fancy" and that you're dedicated to it -- your future is safer than so many other people who even in their 40s have no idea wtf they're gonna do tomorrow.
Also, I found it funny that the parents got excited that the MC "chose the law-department". If they meant being a lawyer, then ho-ly shit is it an overly saturated, unsafe job market. I wouldn't knock it off at being worse than being a painter.
The problem isn't what the child is capable of doing or not, especially in Asian society.
What's important is what the parents and society think of what you choose.
And being a Painter is considered to be one of the lowest level of career in Asian society, as they believe that it's something that only a few in millions could succeed in with low payout, and taking a risky future like that is undesirable.
Plus Asian society also consider that there is no honour or prestige associated with these jobs, unless you are from a family associated with it (aka., you only gain prestige by becoming a Painter, if you belong to a family with history of producing Painters).
On the other hand, becoming a Doctor, Engineer or Lawyer has higher value, as not only those jobs allow you opportunity for government jobs (key factor, as they are considered the most safe/stable jobs), but also by being successful in them, means you are above others, since thousands/millons take those profession as their career path, and only by beating them does you gain value (meaning, the more people are after a segment, the more valuable it is and higher the honour and prestige you gain when successful; aka., importance to your score and rank).
So, it wouldn't be odd for a Lawyer to get high value socially than a Painter, even if the Painter earns more than the Lawyer (doesn't matter if lawyer profession is oversaturated).
And those people would easily justify it as,
you need Doctor to stay alive, Lawyer to avoid legal issues, and Engineers to make life easy. There is none of that with Painting (or similar lowly viewed jobs), as it's just a hobby and waste of practical time.