1) (하)는 동안 * the two things are happening at the same time. You can go swimming while I'm having lunch. (You / I) 내가 점심을 먹는 동안 넌 수영을 하러 갈 수도 있어. * If something happens while something else happens While I was waiting at the bus stop, three buses went by.(I / Buses) 내가 버스 정류장에서 기다리는 동안 세 대의 버스가 지나갔다. -> Each subjects are different. 2) verb + ~며 / ~(으)면서 / ~하면서 * while; as; during; at the same time (that) -> you have to use same subject. He's eating while he uses a computer. (HE) 그는 컴퓨터를 하면서 밥을 먹고 있다. He can dances and sings at the same time (HE) 그는 동시에 춤추면서 노래할 수 있다.

Not really, 친구가 요리하는 동안 책 봤어요. I read a book while my friend was cooking 친구가 요리하면서 책 봤어요. My friend read a book cooking. Hope that helps. :)

Thanks for your response Hailey! I noticed in your example, the difference between your two example english sentences is the word "while"... Although they kinda mean the same thing. Are you saying they are just the same? :)

공부하면서 음악을 들어요. Listen to music studying 공부하는 동안 음악을 들어요. Listen to music while studying