Koreans know how to make movies. They definitely have their own style, especially for Asian movies. Not much overacting like Asians tend to do. Chang-Gwol (Rampant) is worth a watch if you like zombie movies. It's not the best Korean zombie movie that I ever watched (that would be Busanhaeng (Train To Busan)) but for this genre it has it's place. The major problem to me is that it was a bit too long. I think with a shorter story it would be more effective. Nonetheless the zombies were pretty creepy, not perfect as their speed varied from super fast to slow when needed in the story. To me those are details but they have to be perfect. In Busanhaeng the zombies have a constant speedy chase what makes it look all more realistic and it adds to the thrills. Nevertheless Chang-Gwol is worth a watch.