sentences:  The kidnapper, dubbed the "Voice", however, seems to be smarter than the police investigators on the case as he knows not to stay on the phone too long and changes potential hostage exchange locations.Not to mention, his emotionless voice suggests a possibility of him being confident he not get caught.The police have a number of suspects including Kyung-bae's former friend businessman Lee Jae-joon whom has a grudge on the former for getting him sent to prison but all have air tight alibis.