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 but only 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. For the first time, they meet.