Secretly Greatly (2013)

Great comedy Endearing dumb characters North Korea / South Korea Heartwarming moments They both have their sad moments

If you like action and heart, you'll probably like these films. With SG you start with some ridiculously (and slapstick) funny moments, and later more spy thriller and action moments. With TMFN you get some heart at the start and more and more action. They're not very similar, but they're both entertaining.