A nifty, well-crafted little thriller that doesn't re-invent the wheel, but refreshingly places the horror genre in an office setting, not often done, and builds up some very strong characters, who you either root for, or cheer at when they get their icky comeuppance. The final reel delivers the thrills and spills, but at the expense of characterisation - it's also pretty unbelievable. But never mind, despite this and some plot holes, the central trio of murderer, wide-eyed intern and policeman pull you along. A wicked dissection of Korean capitalist values, workplace insecurities and one-upmanship.