MuMyung played for Plus before being traded to SK Telecom T1 in 2004.. There he stayed until he had to go to the army where he eventually joined Air Force ACE. Once his duties were done, he returned to SK Telecom T1 and soon became a coach.
MuMyung left the coaching staff in February 2010 for personal reasons.
|2nd||2002-2003||iTV Ranking 5th League|
|3rd||2002||iTV Ranking 4th League|
|1st||2001-2002||KPGA Winners Championship|