I may want to add that as a person who had a lot of exposure to Korean (but is not native). Directly translating for instance “나는 라면” with the example context you mentioned, feels like „in my case, Ramen“. The 는/은 is describing the 나 in a way that is contrasting whatever was said in the current context. It is certainly used for saying something that is different from the other. „Well in MY case, it is …“, but it may work for other cases too, I am not totally sure.