Since i like espionage movies, I consider this my best Korean drama ever. This also made me like and love Lee Byonghun as an actor. Actually, am not a Kpop fan but this drama introduced me to many beautiful Korean songs (the 4 OSTs here) and BIGBANG(my 1st time to hear their songs and i've been loving this group since then). As for the storyline, i should say, TOP RATE! The cast- TOP RATE! It was like i was watching a movie (like in big screen/cinema)!