That's a Republic of Korea Air Force CASA/IPTN CN-235.
"The CASA/IPTN CN-235 is a medium-range twin-engined transport plane that was jointly developed by CASA of Spain and IPTN of Indonesia as a regional airliner and military transport. Its primary military roles include maritime patrol, surveillance, and air transport." - Wiki
"The CASA/IPTN CN-235 is a medium-range twin-engined transport plane that was jointly developed by CASA of Spain and IPTN of Indonesia as a regional airliner and military transport. Its primary military roles include maritime patrol, surveillance, and air transport." - Wiki
http://www.airliners.net/photo/South-Korea--/Airtech-CN-235-100M/1990905/&sid=208320d5b79f3bd8d6bdc2ec5dfdb7b6