Top 4 in Top 5 excellent actor Kim Soo Hyun's movies.
Secretly Greatly (2013) - Trailer
Secretly Greatly tells the story of a group of spies called Army 5446 who are trained from a young age by special military agencies of North Korea, aiming for the noble goal of Korean reunification. They secretly infiltrate Korea, disguised as an idiot, a rock intern, and a high school boy, respectively. After going through a long boring time without receiving any orders from North Korea, they gradually become familiar with the life of ordinary people in the poor neighborhood. Until one day, the life they had always dreamed of was turned upside down when the three suddenly received a "secret and great" mission. What is that secret and grand mission?