Did anybody at some point think Detective Seo Tae-Yoon was the killer?
At one point I thought it was Detective Seo Tae-Yoon, the one from Seoul. Because they asked why would he come from Seoul to the boondocks and also because he visited the radio station looking for the postcard, so I thought he was looking for it because he sent it and wanted to destroy the evidence he had left behind. Then, a little later in the movie I realized it wasn't him. But wouldn't it have been great if he was the killer? sort of like a twist ending?