He basically calls a non-blood-related older dude - older brother, it's Korean culture to call an older guy older brother. So don't freak out thinking the Uke is his actual older brother, he ain't, and you're not reading incest.
omfg I had a hunch, the translation was really misleading
BASICALLY ITS HYuNG BUT THE TRANS ARE NOT THE BEST PLUS PEOPLe ADDED WRONG TAGS
He basically calls a non-blood-related older dude - older brother, it's Korean culture to call an older guy older brother. So don't freak out thinking the Uke is his actual older brother, he ain't, and you're not reading incest.