University of Economics in Katowice is one of the top universities in Poland
Do you think it's worth for a Korean guy to study in Poland? (If I'm planning to live in Europe)
If you want a job in Europe, DON'T study economics, business, administration, marketing and finance, The market is super-saturated with graduates in those fields. Or if you must study in these fields, either a) study at one of the very best schools in the WORLD (like Harvard or LSE, no Polish schools qualify), OR study a math-intensive field like actuary science, econometrics, financial mathematics or financial engineering at a very, very good school (again, not many, if any, Polish schools qualify) AND be a top student AND be a very, very aggressive go-getter and self-promoter (forget about it if you are a mediocre student or the stereotypically shy and polite Asian nerd type).
Actuary sciences is a very highly paid field and you will never have to worry about finding a job anywhere. The studies are VERY difficult, though, because of all the very difficult exams you have to take.
You best option, though, is to study petroleum engineering, geological engineering or biomedical engineering, For that, you probably have schools in Korea that are better or at least as good as those in Poland. Or pick a very good university in Western Europe or the United States.
You really haven't given any good reason for wanting to study in Poland, specifically, so I have to agree with your parents here. Do you even know anything about the country?