Kim Byong-gook works as section chief in big bureau-building. He is believed to be a family man, but his colleagues don't like him much. One day, Byong-gook slaughters his whole family and then disappears. Detective Jong-hoon is investigating the case and also asking Kim's colleagues about possible clues, but it seems they can't help him. Except Lee Mi-rye. The policeman recognizes that the young girl seems to know more about his suspect, but is hiding something from him. So Detective Jong-hoon is watching the CCTV-Tapes and see Byong-gook entering the building - but doesn't come out again. Jong-hoon believes Kim must hide in the building, which makes the workers afraid about to work - and they are absolutely right!