Responses
First off, It's Korea, not japan, Second, correct me if I'm wrong but 'Hyung' is referred to someone who is older than you (male) and is a close friend or an older brother (family)
I guess being called hyung means you're close to the one who calls you that. Well I'm not korean but that's how I understand it ( ╹▽╹ )

Why is "hyung" so important to people in Japan and they are so obsessed with it i really want to know the reason i think it's like just calling by ur name thats it ( ̄へ ̄) ╮( ̄▽ ̄)╭