Kim Byeong-Gook works family man and reliable, but, one day, he kills his entire family and disappears. Detective Jong-Hoon investigates the murder case and talks with his Kim Byeong-Gook's co-workers at his office. His colleagues though are not very forthcoming with details. Besides, Lee Mi-Rye (Ko Ah-Sung), who was very close with Kim Byeong-Gook, they seem to be hiding something.