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.
Sunbae is a Korean term used to address or refer to someone who is senior in age, grade, or experience. It is commonly used in schools, workplaces, and other social settings to show respect to those who are older or have been in the same institution longer.
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!