I've been a professional musician in Seoul for a few decades now, and tend to be a realist when it comes to these sorts of frank questions...Korea is not Japan, and it's certainly not Disneyland. And it's been a red ocean for professional work in applied music arts, for decades now.
But hey, if you have a four-year degree from one of the qualifying seven English speaking nations (you already more than qualify), are good at communication and working with kids in education, and happen to be a musician, it can be fun in the very short term to teach English and bump around with clubs bands on the weekend...it's an easier way through the door than fishing for a job in your professional field, even though it may not be what you'd prefer to do.
But for a myriad of cultural-linguistic reasons, Westerners in general don't get on especially well with an extended residence here, and age (read: being over the age of 30) plus not being fluent in the language can make both meaningful socializing and securing a job in most fields of non-English-teaching work extremely difficult, getting sponsored by a company to obtain the correct visa on top of that being not easy either. Suffice to say, I wouldn't recommend South Korea in this specific case, for a number of reasons others have already mentioned.
And quite coincidentally, I was asked a similar question recently on Quora, specifically relating to a young bassist's inquiry. In short, I told him he should probably come here to get plugged in
while studying Korean (being a younger fellow), but other points may nonetheless apply:
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And there are ways to meet locals and be a part of the bustling Hongdae live scene, just as hundreds of non-Korean musicians have done in the past. Seoul even has a small but long-running ska scene, including 1st gen. Jamaican ska/calypso-style Kingston Rudieska and a few other bands. But making money as a non-local musician is quite difficult to do right off the bat, and issues of taxation have to be additionally sorted out, under the correct visa.
Dislike K-pop? So does most of the hungry, live-performing Hongdae scene
But if a year off or so to do something different is what you have in mind, spending one's "belated gap year" in Seoul or Busan can be a refreshing change
for the time being. Keeping one's expectations low and learning to coexist in a society that is culturally the opposite of that of North America in so many ways may be a challenge, but that's pretty much the reason why I've loved living here for the past 32+ years.
tl;dr Korea is certainly not for everyone
