Yedang Entertainment's chairman Byun Doo Sub (54) passed away on the 4th with the cause of death thought to be exhaustion. 

Yedang Entertainment broke the news on the stating, "Chairman Byun Doo Sub passed away this morning while he was working in his office due to overworking. His body was transported to the Gangnam St. Mary's Hospital, and after determining the exact cause of death, the body will be put to rest later today."

Byun Doo Sub was known as the husband of singer Yang Soo Kyung and used his experience as a DJ and manager to eventually start his own agency, Yedang Entertainment. Yedang Entertainment currently boasts talented artists including Ali and C-CLOWN.

May he rest in peace. Our hearts go out to all his loved ones and friends affected by this unfortunate passing.

Source: Star News via Nate