"Korea is hot."
When you're saying "Korea is..." does it matter whether you say 한국은 or 한국이?
A rather late response but for anyone else that stumbles upon this; No, both '은' and '이' are interchangeable as subject markers in this sentence and other basic sentences.
I am not quite sure, but 은/는 marks the TOPIC or THEME of a sentence while 이/가 marks the SUBJECT. Could someone confirm this? When I was learning Japanese (not duo) there was a sentence which started (translated) as 일본은 산이 ... which meant “Well about Japan, the mountains are...”, is this the case in Korean too?