Thanks for the advice! I don't think I'll be going down the route of getting a PhD, although at this point, before getting into graduate linguistics, I guess anything's possible. I definitely will go for a sub-field that interests me. On that note, is there any literature or any websites that you recommend where I can familiarize myself with the different areas of linguistics to figure out what they entail and which one would be right for me? From what it seems like, Second-Language Acquisition or Natural Language Processing are areas I might be interested in. I'm definitely interested in learning languages myself, so studying how that process happens sounds intriguing. Also, it seems like the job prospects for NLP should only get better and better in the future. Am I right in hearing that NLP is where the most demand is right now for linguistics jobs?
On another note, I posted this on reddit in the r/korea and r/linguistics subreddits, and most of the response that I got was that as soon as I try to find work outside of Korea, the value of that SNU master's in linguistics would plummet. Does this sound true to you?