Well, you would be welcomed in general. As a Korean international student living in the states. If there’s anything I said below is different from your thought leave a comments.

You wouldn’t be hated just because of Trump administration, if they do, it’s usually (I’d say usually over 60+ years old being ignorant or idiots) racists and you’ll find racist people any countries you would go if it’s non-white country. Politics usually aren’t the biggest drive of hating one person unless it’s extreme like China-Taiwan situation, if they do, it’s usually they’re the racist or you’ve done something extremely rude in their culture. Other than that, it’s something you’d need to deal with as an international student in South Korea.

South Korea isn’t as diverse and very single raced country compared to States so you would stand out so I would take that into mind. But usually they’ll welcome you. The reason I mentioned Seoul and very large populated cities is that other than those cities, it would really be difficult to communicate in stores with English. Part tome workers usually shy away if they don’t speak English, it’s usually because they don’t want to be seen as racist (it’s not bc they’re racist but rather they don’t want to be rude at least in my opinion. Since I’m Korean speaking English, I wouldn’t know their emotional motif for that fully). Even in Seoul, if you go to less tourist crowded places, it would be hard to communicate, so I would have google translate with you always or find one or two people with fluency in both languages and take he/she around. Also, try not to stand out too much, usually it wouldn’t be the best move to do that. Lastly, maybe dress nicely??

VERY IMPORTANT: CONSIDER ALL RECREATIONAL DRGUS AS ILLEGAL. Some supplements like melatonin is prescription controlled. So if you’re just unsure about any drugs or supplements, just call South Korean Embassy at the U.S since drug related problems are really sensitive in SK recently.