does “무슨 노래 부른 거야/거예요?” make sense? If I said “무슨 노래 부른 거야?” to my friend who sings something really weird, is it going to sound natural? but if it isn’t, pls tell me the natural one

What does 꾸앙 mean? i saw it on a variety show and there was a text showed up on the screen like “꾸앙”

what’s the difference between 밥 먹지 (without a question mark) and 밥 먹어 I saw a lot of people and even Koreans said 밥 먹지 and it doesn’t seem like a question. Please tell me it is

what is 깨 in 집에 빨리 들어가깨? can someone pls tell me what 집에 빨리 들어가깨 means? i don’t get it why 깨 is after 들어가 like what does it mean?

pls tell me how to pronounce 뤌 can someone tell me how to pronounce 뤌 as in like 일월?