Learned a few
My native language is korean, and I'm fluent in English. I've tried learning Chinese but I gave up after like 2 months lol.
My high-school forced us to either choose French or German, so I learned German for about 2 years, so I have a very basic understanding of it, though I haven't used it again in years.
I also know some Afrikaans, a west Germanic language since it's pretty common language people speak where I live currently, they also made it a compulsory subject in schools so I had to know it since primary school, it's still very lacking since I had no interest in it tbh.
I would still love to learn Japanese, though it also seems pretty difficult.
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I mean I think I can recognize the words by sound from my experience from watching Japanese tv shows and anime, but yeah the actual writing part gets me, lol.
Hey you should really go for japanese, trust me there are quite enough similarities to korean (structure of sentence wise and some words, counting floors etc.), the hardest part is kanji=)