Do Korean next
I have been studying korean since 2012, I would really like to see Korean been tought by others however Talk to me in Korean is also a good alternative. but I would like my korean friends to learn english too, so we should defo put this language up. Korean for English speakers, English for Korean speakers.
저는 한국어를 할 수 있어요 , 그리고 국악이 사랑해요
Not enough to really make a significant difference. They have different orders for Hangul in a dictionary and they use two or three old fashioned letters that South Korea abandoned a long time ago for convenience sake. Their accent in the North is rather rigid and somewhat more nasal I think. But the difference is the same as that of a New York and Texas accent in English. For the most part it's the exact same language.
Remember, Duolingo is a business that needs to make money. Language selection is driven by economic demand, not by the preferences or desires of people wanting free instruction in a given language. Languages in non-ABC alphabets are much more difficult to teach -- and see the frustration many have here with accents -- and there is likely little demand (as in people willing to pay $$$) for some of the languages people have requested, like Latin, Biblical Greek, Hebrew, specific dialects of Spanish, several others, and, probably, Korean.
Language difficulties aside, I would imagine there to be a high demand for Asian languages such as Japanese and Korean .... there is a significant cultural overlap between them and the US and I personally do a lot of business with Korean folks, there is a large population of them (in major US cities anyway)