IRIS is a 2009 South Korean espionage television drama series, starring Lee Byung-hun (Kim Hyun-jun), Kim Tae-hee ( Choi Seung-hee), Jung Joon-ho (Jin Sa-woo), Kim Seung-woo (Park Cheol-young), Kim So-yeon (Kim Seon-hwa) and T.O.P (Vick). I have watched this only in February 2016, my good friend Marj gave me a high definition copy. The plot revolves around two best friends who fell in love with the same woman. The twist is so great that after finishing all the episodes, I immediately looked for the sequel, it has but not as brilliant as this though.
Since then I am unable to finish Korean dramas as I always look for the same excitement I felt whenever I am watching IRIS. Can anybody suggest a Korean drama series that I can watch but should be espionage!