I wanted to read a comic today and i unsterstood quite a lot even if i suck at korean (for the parts i didn't understand i used Naver Papago (korean translator) but there was one sentence that i don't understand
꿈이구나, 뜬금없이 왜 그날 일을..
Can you help me?
Thank you^^
꿈이구나, 뜬금없이 왜 그날 일을..
=> Ah, it was a dream. But why that day's incident out of the blue ... (뜬금없이 = out of the blue; unexpectedly with no lead-up)
It is a very informal phrase of thinking out loud. It looks like the person dreamed of an actual experience from his past and is wondering why he had that dream for no apparent reason.