The word "sunbae" in Korean is a deep term of respect. It is almost always used for someone much older or of a much higher social position.
Senior in Korean.
It's a term for upperclassman; for example, a freshman would refer to any sophomore, junior, or senior as "sunbae" In the workplace, "sunbae" is used as a term for anyone who has worked there longer than you, or has a higher position than you.
Senior
Hyungnim is basically older brother, while sunbae refers to a more experienced colleague or friend.
Basically, its a term of respect when addressing a colleague that is younger than you. Like at any Entertainment; a rookie group would address the more experienced performers as "Sunbae" and the older group would address the younger ones as "Hoobae".
Korean
From what I found he is the main actor in this Korean drama: Rock Rock Rock
Fish
kangaroos
weapon sales
weapon sales
Nope,its just rumours. They are probably close sunbae and hobae relationship!