Korean, police corruption, internal affairs, craziness. The violence is somewhat less graphic than usual, with no blood sprays. What's become of the genre? The structure is completely standard, so it comes down to the particularity of the McGuffins; some are pretty funny, others totally stock. I guess this is some proof that convoluted whodunnits can survive in the age of the mobile phone. Cho Jin-woong does well as the bad dude.
On Dmitriy's recommendation. The corruption of local government in a small Siberian town, the intervention of a lawyer from Moscow, an adaptation of the book of Job. Excellent cinematography, fantastic landscapes, solid acting, depressing plot, somewhat pro forma characters. It reminded me most of von Trier's Breaking the Waves, mostly because of the almost relentless downwardness of the spiral, but affected me less. I guess there's also something of Lukas Moodysson here too.