It's like the Korean version of The Patriot - though there's no great Jason Isaacs equivalent to cut through the convoluted story (hallo long lost twin!) and it's super earnest and cloying for my tastes.
But dude, that scene where Jun JiHyun jumps from one roof to another, trips and rolls into a sign and crashes onto the ground, crawls for the gun, stands and starts shooting, all in one take? Dude....I love Korean action stunts/directing. You ain't gonna see ScarJo doing that shit in one take.