Yeong-sik is a personal tax accountant. Two years into his marriage, he feels his wife is not like before. He coincidentally sees his wife meeting with another man so he puts a tail on her only to come back empty. Frustrated, Yeong-sik tails her himself but there`s nothing out of the ordinary. A while later, So-yeon`s body is found in an isolated area and the police call in Yeong-sik and Oh Min-soo, the man So-yeon met for investigation. Oh Min-soo denies he did anything and that he even had an affair with So-yeon. Yeong-sik calls the police and asks how his investigation went but the police say he just denied it and that they`ll call them when the case is closed. But what he wants to know how he testified about his wife, who the criminal is and what the relationship between So-yeon and Oh Min-soo is...