Responses
No, it's still "hyung" in the original Korean. I guess the S-Class translator in Asura was changed OR they changed the rules for translation.
whenever you see yoohyun call yoojin by his name, always assume that he's saying "hyung" in the korean ver. it's not common to call people by their name only in korean culture anyway, at most yoohyun would call him "yoojin-hyung"(but i don't think he ever would since yoojin is his brother related by blood).
Huh, did Yoohyun originally change how he call Yoojin? I mean in the newest chapter, he called him 'Yoojin' not 'Brother'